CRC · California Residential Code
Definitions related to egress and emergency escape and rescue openings
Basements and every sleeping room must have an operable emergency escape opening that opens from the inside without keys/tools, provides a minimum net clear opening (normally 5.7 ft², 5.0 ft² for grade‑floor) and has a sill ≤44 in; below‑grade openings also need an area well sized to allow full opening — see § R319 and the CRC definitions chapter § R202 for official term wording.
Last reviewed: July 6, 2026
What the code requires — 2-4 sentences
The California Residential Code locates defined terms in § R202 (the definitions chapter) and then applies those terms to the emergency‑egress rules in § R319. The code requires every basement, habitable attic, sleeping loft room and every sleeping room to have at least one operable emergency escape and rescue opening sized and installed to provide an unobstructed escape route; the dimensional and operational limits are in § R319.1 through § R319.4. See § R202 for the official definitions (index shows definitions are in § R202), and see the emergency‑opening requirements in § R319.
The single most important rule: the window or door used for emergency escape must open from the inside without keys or tools and provide a minimum net clear opening large enough to allow escape or rescue — follow the specific size and sill‑height rules in § R319.2 and the operational rules in § R319.1.1.
Note: the uploaded files show that definitions live in § R202 but the full text of § R202 (the definitions list) was not included in the retrieved materials; the dimensional and performance provisions below are taken from § R319 as shown in the provided code excerpts.
Requirements in detail
Key defined terms (first mentions are bolded)
- Emergency escape and rescue opening — the opening that provides escape or firefighter rescue access for basements, sleeping rooms, habitable attics and sleeping lofts; requirements for these openings are in § R319.
- Net clear opening — the usable clear opening produced by normal operation of the window/door (size and dimensions are measured after the opening is fully operated) as required in § R319.2.2.
- Grade‑floor emergency escape and rescue opening — a special category with a slightly smaller area requirement (exception in § R319.2.1).
- Area well — the exterior recessed space required where an emergency opening’s bottom is below adjacent grade; requirements in § R319.4.
- Window‑opening control device / fall prevention device — permitted if compliant with ASTM F2090 and installed per § R319.1.1 (and location limits).
- Bars, grilles, covers and screens over EMER openings — allowed only if releasable from the inside without keys/tools per § R319.4.4.
Decision‑relevant dimensions and values (quick reference table)
| Requirement / dimension | Value / threshold | Code Reference |
|---|---|---|
| Minimum net clear opening area (general) | 5.7 ft² | § R319.2.1 |
| Minimum net clear opening area (grade‑floor exception) | 5.0 ft² | § R319.2.1 (Exception) |
| Minimum net clear opening height | 24 in | § R319.2.2 |
| Minimum net clear opening width | 20 in | § R319.2.2 |
| Maximum bottom of clear opening above finished floor (sill height) | 44 in | § R319.2.3 |
| Opening under decks/porches — minimum path | 36 in height × 36 in width | § R319.2.4 |
| Area well minimum horizontal area | 9 ft² | § R319.4.1 |
| Area well minimum width / horizontal projection | 36 in | § R319.4.1 |
| Area well ladder/step requirement depth threshold | > 44 in (provide ladder/steps) | § R319.4.2 |
| Ladder/rung spacing (area well) | ≤ 18 in o.c.; width ≥ 12 in; projection ≥ 3 in | § R319.4.2.1 |
| Steps (area well) | tread ≥ 5 in depth; riser ≤ 18 in; width ≥ 12 in | § R319.4.2.2 |
| Bars / grilles over opening | Releasable/removable from inside without key or tool; release must be maintained operable | § R319.4.4 |
| Window‑opening control device | Permitted if ASTM F2090 compliant; release operable and device not above 70 in above finished floor when installed per § R319.1.1 | § R319.1.1 |
| Door as emergency opening | Must be side‑hinged (swinging) or sliding | § R319.3 |
(When measuring: the net clear opening must be the opening produced by normal operation — measure after the window/door is fully opened; see § R319.2.2.)
Where the definitions live
- The CRC index identifies the definitions chapter as § R202 (this is the authoritative location for defined terms used throughout the CRC), but the full text of § R202 was not present in the provided files. Use § R319 for the operative emergency‑opening rules and rely on § R202 in your jurisdictional copy for official term wording.
Exceptions & special cases
- Grade‑floor openings: a grade‑floor emergency escape and rescue opening may use a 5.0 ft² minimum net clear opening instead of 5.7 ft² (see § R319.2.1 (Exception)).
- Basements: several exceptions may remove the emergency window requirement for basements (e.g., basements with ceiling height < 80 in, basements with direct exit doors to the exterior, basements smaller than 200 ft² without habitable space); see § R319.1 exceptions.
- Sprinklered buildings: where the dwelling or townhouse unit is equipped throughout with an automatic sprinkler system installed per CRC rules, some basement sleeping rooms may be exempt when alternate means of egress are provided (see the exceptions in § R319.1).
- Replacement windows: replacement windows installed in existing RC‑scope buildings are often exempt from the full new‑construction dimensional rules provided they meet the conditions in § R319.5 (e.g., largest standard size that fits existing frame, not part of change of occupancy).
- Under‑deck openings: emergency openings under decks/porches must give a clear path 36 in × 36 in to a yard or court per § R319.2.4.
Common mistakes
- Measuring “gross” opening instead of net clear opening (the code requires the net clear opening produced by normal operation — § R319.2.2). Always measure with the window/door fully operated.
- Installing fixed burglar bars or security devices that require a key, special knowledge or tools to release from the inside — the code requires inside release without key/tools for any bars/grilles over required openings (§ R319.4.4).
- Assuming any window that looks “big enough” meets the 5.7 ft² area requirement: a window must meet both the minimum area and minimum height/width rules; meeting only one is not sufficient (§ R319.2.1 and § R319.2.2).
- Forgetting sill height: the bottom of the clear opening must be ≤ 44 in above the finished floor (§ R319.2.3). A window with adequate area but too‑high a sill is noncompliant.
- Ignoring area‑well requirements: if the opening is below adjacent grade, the area well must allow the window to be fully opened and meet the horizontal area and ladder/step rules (§ R319.4.1–R319.4.2).
Worked example — concrete scenario
Scenario: A homeowner adds an egress window to a basement sleeping room. The installed window, when fully opened, provides a clear opening of 36 in (width) × 24 in (height) measured net (after normal operation). The bottom of the clear opening is 40 in above the finished floor. The window opens to a below‑grade area well.
Step 1 — net area check:
- 36 in × 24 in = 864 in². Convert to ft²: 864 ÷ 144 = 6.0 ft² → this exceeds the 5.7 ft² minimum in § R319.2.1, so area is OK.
Step 2 — minimum dimension check:
- Height = 24 in (meets minimum 24 in), width = 36 in (exceeds minimum 20 in) — both pass § R319.2.2.
Step 3 — sill height:
- Bottom at 40 in ≤ 44 in permitted by § R319.2.3, so sill is OK.
Step 4 — area well:
- Because the opening is below grade, the area well must be at least 9 ft² horizontal area with a horizontal projection and width ≥ 36 in, and the well must allow the window to be fully opened (§ R319.4.1). If the well is deeper than 44 in, provide an approved ladder or steps that meet § R319.4.2.
Conclusion: the 36"×24" clear opening, 40" sill, and a compliant area well (≥9 ft², ≥36" wide/projection) meet the CRC requirements for an emergency escape and rescue opening in this basement sleeping room.
Related provisions (pick up the detailed rules here)
- § R202 — Definitions chapter (terms used throughout the CRC; index points to § R202).
- § R319.1 — Where emergency escape and rescue openings are required (basements, sleeping rooms, habitable attics).
- § R319.1.1 — Operational constraints; release device and window‑opening control devices (ASTM F2090 reference).
- § R319.2.1 — Minimum net clear opening area (5.7 ft²; 5.0 ft² for grade‑floor).
- § R319.2.2 — Minimum net clear opening height/width; measure after normal operation.
- § R319.2.3 — Maximum sill height (44 in).
- § R319.2.4 — Openings under decks/porches must provide a 36"×36" path.
- § R319.3 — Emergency escape and rescue doors (must be side‑hinged or sliding).
- § R319.4 (and subsections) — Area‑well sizing, ladders/steps, drainage, and rules for bars/grilles.
- § R319.5 — Replacement‑window exceptions and conditions.
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
CRC § 12-3 High relevance — show source text
Such bars, grills, grates or any similar devices shall be equipped with an approved exterior release device for use by the fire department only when required by the authority having jurisdiction.
Where security bars (burglar bars) are installed on emergency egress and rescue windows or doors, on or after July 1, 2000, such devices shall comply with California Building Standards Code, Part 12, Chapter 12-3 and other applicable provisions of Part 2.
Exception: Group R-1 occupancies provided with a monitored fire sprinkler system in accordance with Section 903.2.8 and designed in accordance with NFPA 13 may have openable windows permanently restricted to a maximum 4-inch (102 mm) open position.
1031.2.2 Maintenance. Fire escape stairways and balconies shall be kept clear and unobstructed at all times and shall be main- tained in good working order.
1031.2.3 Examination. Fire escape stairways and balconies shall be examined for structural adequacy and safety by a registered design professional or other person acceptable to the fire code official every 5 years. The examination shall determine whether the fire escape stairways and balconies can support the dead load plus a live load of not less than 100 pounds per square foot (4.78 kN/m). An inspection report shall be submitted to the fire code official after such examination.
1031.3 Emergency escape and rescue openings. Emergency escape and rescue openings shall comply with Sections 1031.3.1 through 1031.3.3.
1031.3.1 Minimum size. Emergency escape and rescue openings shall have a minimum net clear opening of 5.7 square feet (0.53 m [2] ).
Exception: The minimum net clear opening for grade-floor emergency escape and rescue openings shall be 5 square feet (0.46 m [2] ).
1031.3.2 Minimum dimensions. The minimum net clear opening height dimension shall be 24 inches (610 mm). The minimum net clear opening width dimension shall be 20 inches (508 mm). The net clear opening dimensions shall be the result of normal operation of the opening.
1031.3.3 Maximum height from floor. Emergency escape and rescue openings shall have the bottom of the clear opening not greater than 44 inches (1118 mm) measured from the floor.
1031.4 Emergency escape and rescue doors. Where a door is provided as the required emergency escape and rescue opening, it shall be a swinging door or a sliding door.
1031.5 Area wells. An emergency escape and rescue opening with the bottom of the clear opening below the adjacent grade shall be provided with an area well in accordance with Sections 1031.5.1 through 1031.5.3.
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1031.5.1 Minimum size. The minimum horizontal area of the area well shall be 9 square feet (0.84 m [2] ), with a horizontal projection and width of not less than 36 inches (914 mm). The area well shall allow the emergency escape and rescue opening to be fully opened.
Exception: The ladder or steps required by Section 1031.5.2 shall be permitted to encroach not more than 6 inches (152 mm) into the required dimensions of the area well.
CRC § 10-62 High relevance — show source text
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(5) Written directions and illustrations on the operation of the emergency escape release mechanisms. These directions shall include a warning that the mechanisms be tested on a monthly basis.
(b) The textual information required by this section shall be printed in a minimum 12-point nondecorative lettering providing a sharp contrast to the background.
(c) Graphical information required by this section shall be of sufficient size to clearly illustrate the intended actions.
[California Code of Regulations, Title 19, Division 1, §4.4] Warning Information Location.
When placed on burglar bar packaging, the information required by California Code of Regulations, Title 19, Division 1, Section 4.3 shall be conspicuously located and shall not be covered or made illegible by product advertising not required by Section 4.3.
[California Code of Regulations, Title 19, Division 1, §4.5(a)] Contractor or Installer Disclosures.
Any contractor or installer of burglar bars shall provide the owner of the residential dwelling the warning information required pursu- ant to California Code of Regulations, Title 19, Division 1, Section 4.3 prior to installing burglar bars.
[California Code of Regulations, Title 19, Division 1, §4.6(a) and (b)] Prohibited Installations.
No person shall install for profit unopenable burglar bars on a residential dwelling:
(a) Where the California Building Code requires openable burglar bars for emergency escape or rescue, or
(b) On mobile homes, manufactured homes or multi-unit manufactured housing unless at least one window or door to the exterior in each bedroom is openable for emergency escape or rescue.
[BE] 1031.3 Emergency escape and rescue openings. Emergency escape and rescue openings shall comply with Sections 1031.3.1 through 1031.3.3.
[BE] 1031.3.1 Minimum size. Emergency escape and rescue openings shall have a minimum net clear opening of 5.7 square feet (0.53 m [2] ). Exception: The minimum net clear opening for grade-floor emergency escape and rescue openings shall be 5 square feet (0.46 m [2] ).
[BE] 1031.3.2 Minimum dimensions. The minimum net clear opening height dimension shall be 24 inches (610 mm). The minimum net clear opening width dimension shall be 20 inches (508 mm). The net clear opening dimensions shall be the result of normal operation of the opening.
[BE] 1031.3.3 Maximum height from floor. Emergency escape and rescue openings shall have the bottom of the clear opening not greater than 44 inches (1118 mm) measured from the floor.
[BE] 1031.4 Emergency escape and rescue doors. Where a door is provided as the required emergency escape and rescue opening, it shall be a swinging door or a sliding door.
[BE] 1031.5 Area wells. An emergency escape and rescue opening with the bottom of the clear opening below the adjacent grade shall be provided with an area well in accordance with Sections 1031.5.1 through 1031.5.3.
CRC § 10-61 High relevance — show source text
- Group R-3 and R-4 occupancies.
Basements and sleeping rooms below the fourth story above grade plane shall have not fewer than one emergency escape and rescue opening in accordance with this section. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room, but shall not be required in adjoining areas of the basement. Such open
2025 CALIFORNIA FIRE CODE 10-61
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MEANS OF EGRESS
ings shall open directly into a public way or to a yard or court that opens to a public way, or to an egress balcony that leads to a public way.
Exceptions: 1. In Groups R-1 and R-2 occupancies constructed of Type I, Type IIA, Type IIIA or Type IV construction equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1. 2. Group R-2.1 occupancies meeting the requirements for delayed egress in accordance with Section 1010.2.13 may have oper- able windows that are breakable in sleeping rooms permanently restricted to a maximum of 4-inch open position. 3. Basements with a ceiling height of less than 80 inches (2032 mm) shall not be required to have emergency escape and rescue openings. 4. Emergency escape and rescue openings are not required from basements or sleeping rooms that have an exit door or exit access door that opens directly into a public way or to a yard, court or exterior egress balcony that leads to a public
way. 5. Basements without habitable spaces and having not more than 200 square feet (18.6 m [2] ) in floor area shall not be required to have emergency escape and rescue openings. 6. Storm shelters are not required to comply with this section where the shelter is constructed in accordance with ICC 500. 7. Within individual dwelling and sleeping units in Groups R-2 and R-3, where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 7.1. One means of egress and one emergency escape and rescue opening. 7.2. Two means of egress. 8. In Group R-2.2 occupancies a certified fire escape is acceptable as a secondary means of egress of existing buildings for this section of the code.
[BE] 1031.2.1 Operational constraints and opening control devices. Emergency escape and rescue openings and any exit doors shall be maintained free of any obstructions other than those allowed by this section and shall be operational from inside the room without the use of keys or tools. Window-opening control devices complying with ASTM F2090 shall be permitted for use on windows serving as a required emergency escape and rescue opening. The release mechanism shall be maintained operable at all times.
Such bars, grills, grates or any similar devices shall be equipped with an approved exterior release device for use by the fire department only when required by the authority having jurisdiction.
CRC § 1030.17.3 High relevance — show source text
Where an elevation change of 30 inches (762 mm) or less occurs between a cross aisle and the adjacent floor or grade below, guards not less than 26 inches (660 mm) above the aisle floor shall be provided.
Exception: Where the backs of seats on the front of the cross aisle project 24 inches (610 mm) or more above the adjacent floor of the aisle, a guard need not be provided.
[BE] 1030.17.3 Sightline-constrained guard heights. Unless subject to the requirements of Section 1030.17.4, a fascia or railing system in accordance with the guard requirements of Section 1015 and having a minimum height of 26 inches (660 mm) shall be provided where the floor or footboard elevation is more than 30 inches (762 mm) above the floor or grade below and the fascia or railing would otherwise interfere with the sightlines of immediately adjacent seating.
[BE] 1030.17.4 Guards at the end of aisles. A fascia or railing system complying with the guard requirements of Section 1015 shall be provided for the full width of the aisle where the foot of the aisle is more than 30 inches (762 mm) above the floor or grade below. The fascia or railing shall be not less than 36 inches (914 mm) high and shall provide not less than 42 inches (1067 mm) measured diagonally between the top of the rail and the nosing of the nearest tread.
SECTION 1031—EMERGENCY ESCAPE AND RESCUE
[BE] 1031.1 General. Emergency escape and rescue openings shall comply with the requirements of this section.
[BE] 1031.2 Where required. In addition to the means of egress required by this chapter, emergency escape and rescue openings shall be provided in Group R occupancies:
Group R-2 occupancies located in stories with only one exit or access to only one exit as permitted by Tables 1006.3.4(1) and 1006.3.4(2).
Group R-3 and R-4 occupancies.
Basements and sleeping rooms below the fourth story above grade plane shall have not fewer than one emergency escape and rescue opening in accordance with this section. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room, but shall not be required in adjoining areas of the basement. Such open
2025 CALIFORNIA FIRE CODE 10-61
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MEANS OF EGRESS
ings shall open directly into a public way or to a yard or court that opens to a public way, or to an egress balcony that leads to a public way.
Exceptions: 1. In Groups R-1 and R-2 occupancies constructed of Type I, Type IIA, Type IIIA or Type IV construction equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1. 2. Group R-2.1 occupancies meeting the requirements for delayed egress in accordance with Section 1010.2.13 may have oper- able windows that are breakable in sleeping rooms permanently restricted to a maximum of 4-inch open position. 3. Basements with a ceiling height of less than 80 inches (2032 mm) shall not be required to have emergency escape and rescue openings.
CRC § 1030.17.4 High relevance — show source text
1030.17.4 Guards at the end of aisles. A fascia or railing system complying with the guard requirements of Section 1015 shall be provided for the full width of the aisle where the foot of the aisle is more than 30 inches (762 mm) above the floor or grade below. The fascia or railing shall be not less than 36 inches (914 mm) high and shall provide not less than 42 inches (1067 mm) measured diagonally between the top of the rail and the nosing of the nearest tread.
SECTION 1031—EMERGENCY ESCAPE AND RESCUE
1031.1 General. Emergency escape and rescue openings shall comply with the requirements of this section.
1031.2 Where required. In addition to the means of egress required by this chapter, emergency escape and rescue openings shall be provided in Group R occupancies .
Basements and sleeping rooms below the fourth story above grade plane shall have not fewer than one emergency escape and rescue opening in accordance with this section. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room, but shall not be required in adjoining areas of the basement. Such open
2025 CALIFORNIA BUILDING CODE 10-59
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MEANS OF EGRESS
ings shall open directly into a public way or to a yard or court that opens to a public way, or to an egress balcony that leads to a public way.
Exceptions: 1. In Groups R-1 and R-2 occupancies constructed of Type I, Type IIA, Type IIIA or Type IV construction equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1. 2. Group R-2.1 occupancies meeting the requirements for delayed egress in accordance with Section 1010.2.13 may have oper- able windows that are breakable in sleeping rooms permanently restricted to a maximum of 4-inch open position. 3 . Basements with a ceiling height of less than 80 inches (2032 mm) shall not be required to have emergency escape and rescue openings. 4 . Emergency escape and rescue openings are not required from basements or sleeping rooms that have an exit door or exit access door that opens directly into a public way or to a yard, court or exterior egress balcony that leads to a public
way. 5 . Basements without habitable spaces and having not more than 200 square feet (18.6 m [2] ) in floor area shall not be required to have emergency escape and rescue openings. 6 . Storm shelters are not required to comply with this section where the shelter is constructed in accordance with ICC 500. 7 . Within individual dwelling and sleeping units in Groups R-2 and R-3, where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 7.1. One means of egress and one emergency escape and rescue opening. 7.2. Two means of egress. 8. In Group R-2.2 occupancies a certified fire escape is acceptable as a secondary means of egress for existing buildings for this section of the code.
CRC § 3-64 High relevance — show source text
R318.8 Ramps. Where required by this code or provided, ramps shall comply with this section.
Exception: Ramps not within or serving a building, porch or deck.
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BUILDING PLANNING
R318.8.1 Maximum slope. Ramps serving the egress door required by Section R318.2 shall have a slope of not more than 1 unit vertical in 12 units horizontal (8.3-percent slope).
Other ramps shall have a slope of not more than 1 unit vertical in 8 units horizontal (12.5 percent).
Exception: Where it is technically infeasible to comply because of site constraints, ramps shall have a slope of not more than 1 unit vertical in 8 units horizontal (12.5 percent).
R318.8.2 Landings required. There shall be a floor or landing at the top and bottom of each ramp, where doors open onto ramps, and where ramps change directions. The width of the landing perpendicular to the ramp slope shall be not less than the width of the ramp. The depth of the landing in the direction of the ramp slope shall be not less than 36 inches (914 mm).
R318.8.3 Handrails required. Handrails shall be provided on not less than one side of ramps exceeding a slope of 1 unit vertical in 12 units horizontal (8.33-percent slope) and shall comply with Section R320.
SECTION R319—EMERGENCY ESCAPE AND RESCUE OPENINGS
R319.1 Emergency escape and rescue opening required. Basements, habitable attics, the room to which a sleeping loft is open, and every sleeping room shall have not less than one operable emergency escape and rescue opening. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room. Emergency escape and rescue openings shall open directly into a public way, or to a yard or court that opens to a public way.
Exceptions [SFM]: 1. Basements with a ceiling height of less than 80 inches (2032 mm) shall not be required to have emergency escape and rescue openings. 2. Emergency escape and rescue openings are not required from basements or sleeping rooms that have an exit door or exit access door that opens directly into a public way or to a yard, court or exterior egress balcony that opens to a public way. 3. Basements without habitable spaces and having not more than 200 square feet (18.6 m [2] ) in floor area shall not be required to have emergency escape and rescue openings. 4. Storm shelters are not required to comply with this section where the shelter is constructed in accordance with ICC 500. 5. Where the dwelling unit or townhouse unit is equipped with an automatic sprinkler system installed in accordance with Section R309, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 5.1. One means of egress complying with Section R318 and one emergency escape and rescue opening. 5.2. Two means of egress complying with Section R318.
CRC § 18.6 High relevance — show source text
R319.1 Emergency escape and rescue opening required. Basements, habitable attics, the room to which a sleeping loft is open, and every sleeping room shall have not less than one operable emergency escape and rescue opening. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room. Emergency escape and rescue openings shall open directly into a public way, or to a yard or court that opens to a public way.
Exceptions [SFM]: 1. Basements with a ceiling height of less than 80 inches (2032 mm) shall not be required to have emergency escape and rescue openings. 2. Emergency escape and rescue openings are not required from basements or sleeping rooms that have an exit door or exit access door that opens directly into a public way or to a yard, court or exterior egress balcony that opens to a public way. 3. Basements without habitable spaces and having not more than 200 square feet (18.6 m [2] ) in floor area shall not be required to have emergency escape and rescue openings. 4. Storm shelters are not required to comply with this section where the shelter is constructed in accordance with ICC 500. 5. Where the dwelling unit or townhouse unit is equipped with an automatic sprinkler system installed in accordance with Section R309, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 5.1. One means of egress complying with Section R318 and one emergency escape and rescue opening. 5.2. Two means of egress complying with Section R318.
R319.1.1 Operational constraints and opening control devices. Emergency escape and rescue openings shall be maintained free of any obstructions other than those allowed by this section and shall be operational from the inside of the room without the use of keys, tools or special knowledge. Window opening control devices and fall prevention devices complying with ASTM F2090 shall be permitted for use on windows serving as a required emergency escape and rescue opening and shall be not more than 70 inches (178 cm) above the finished floor. The release mechanism shall be maintained operable at all times.
Such bars, grills, grates or any similar devices shall be equipped with an approved exterior release device for use by the fire department only when required by the authority having jurisdiction.
Where security bars (burglar bars) are installed on emergency egress and rescue windows or doors, on or after July 1, 2000, such devices shall comply with California Building Standards Code, Part 12, Chapter 12-3 and other applicable provisions of this code.
R319.2 Emergency escape and rescue openings. Emergency escape and rescue openings shall have minimum dimensions in accordance with Sections R319.2.1 through R319.2.4.
R319.2.1 Minimum size. Emergency escape and rescue openings shall have a net clear opening of not less than 5.7 square feet (0.530 m [2] ).
Exception: The minimum net clear opening for grade-floor emergency escape and rescue openings shall be 5 square feet (0.465 m [2] ).
R319.2.2 Minimum dimensions. The minimum net clear opening height dimension shall be 24 inches (610 mm). The minimum net clear opening width dimension shall be 20 inches (508 mm). The net clear opening dimensions shall be the result of normal operation of the opening.
CRC § 1001.1 High relevance — show source text
The requirements detail the size, arrangement, number and protection of means of egress components. Functional and operational characteristics that will permit the safe use of components without special knowledge or effort are specified.
The means of egress protection requirements work in coordination with other sections of the code, such as protection of vertical openings (see Chapter 7), interior finish (see Chapter 8), fire suppression and detection systems (see Chapter 9) and numerous others, all having an impact on life safety. Sections 1003 through 1031 are duplicated text from Chapter 10 of the California Building Code ; however, the California Fire Code contains an additional Section 1032 on maintenance of the means of egress system in existing buildings. Retroactive minimum means of egress requirements for existing buildings are found in Chapter 11.
SECTION 1001—ADMINISTRATION
1001.1 General. Buildings or portions thereof shall be provided with a means of egress system as required by this chapter. The provisions of this chapter shall control the design, construction and arrangement of means of egress components required to provide an approved means of egress from structures and portions thereof. Sections 1003 through 1031 shall apply to new construction. Section 1032 shall apply to existing buildings.
Exception: Detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress and their accessory structures shall comply with the California Residential Code .
[BE] 1001.2 Minimum requirements. It shall be unlawful to alter a building or structure in a manner that will reduce the number of exits or the capacity of the means of egress to less than required by this code.
SECTION 1002—DEFINITIONS
[BE] 1002.1 Definitions. The following terms are defined in Chapter 2:
ACCESSIBLE MEANS OF EGRESS.
AISLE.
AISLE ACCESSWAY.
ALTERNATING TREAD DEVICE.
AREA OF REFUGE.
AUTOMATIC FLUSH BOLT.
BLEACHERS.
BREAKOUT.
CIRCULATION PATH.
COMMON PATH OF EGRESS TRAVEL.
CONSTANT LATCHING BOLT.
CORRIDOR.
DEAD BOLT.
DEFEND-IN-PLACE.
DOOR, BALANCED.
EGRESS COURT.
EMERGENCY ESCAPE AND RESCUE OPENING.
EXIT.
EXIT ACCESS.
EXIT ACCESS DOORWAY.
EXIT ACCESS RAMP.
EXIT ACCESS STAIRWAY.
EXIT DISCHARGE.
EXIT DISCHARGE, LEVEL OF.
EXIT PASSAGEWAY.
EXTERIOR EXIT RAMP.
2025 CALIFORNIA FIRE CODE 10-5
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
MEANS OF EGRESS
EXTERIOR EXIT STAIRWAY.
FIRE EXIT HARDWARE.
FIXED SEATING.
FLIGHT.
FLOOR AREA, GROSS.
FLOOR AREA, NET.
FOLDING AND TELESCOPIC SEATING.
GRADE FLOOR EMERGENCY ESCAPE AND RESCUE OPENINGS.
GRANDSTAND.
GUARD.
HANDRAIL.
HORIZONTAL EXIT.
INTERIOR EXIT RAMP.
INTERIOR EXIT STAIRWAY.
LOW ENERGY POWER-OPERATED DOOR.
MANUAL BOLT.
MEANS OF EGRESS.
MERCHANDISE PAD.
NOSING.
OCCUPANT LOAD.
OPEN-AIR ASSEMBLY SEATING.
OPEN-ENDED CORRIDOR.
CRC § 18.6 High relevance — show source text
Basements with a ceiling height of less than 80 inches (2032 mm) shall not be required to have emergency escape and rescue openings. 4 . Emergency escape and rescue openings are not required from basements or sleeping rooms that have an exit door or exit access door that opens directly into a public way or to a yard, court or exterior egress balcony that leads to a public
way. 5 . Basements without habitable spaces and having not more than 200 square feet (18.6 m [2] ) in floor area shall not be required to have emergency escape and rescue openings. 6 . Storm shelters are not required to comply with this section where the shelter is constructed in accordance with ICC 500. 7 . Within individual dwelling and sleeping units in Groups R-2 and R-3, where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 7.1. One means of egress and one emergency escape and rescue opening. 7.2. Two means of egress. 8. In Group R-2.2 occupancies a certified fire escape is acceptable as a secondary means of egress for existing buildings for this section of the code.
1031.2.1 Operational constraints and opening control devices. Emergency escape and rescue openings and any exit doors shall be maintained free of any obstructions other than those allowed by this section and shall be operational from inside the room without the use of keys or tools. Window-opening control devices complying with ASTM F2090 shall be permitted for use on windows serving as a required emergency escape and rescue opening. The release mechanism shall be maintained operable at all times.
Such bars, grills, grates or any similar devices shall be equipped with an approved exterior release device for use by the fire department only when required by the authority having jurisdiction.
Where security bars (burglar bars) are installed on emergency egress and rescue windows or doors, on or after July 1, 2000, such devices shall comply with California Building Standards Code, Part 12, Chapter 12-3 and other applicable provisions of Part 2.
Exception: Group R-1 occupancies provided with a monitored fire sprinkler system in accordance with Section 903.2.8 and designed in accordance with NFPA 13 may have openable windows permanently restricted to a maximum 4-inch (102 mm) open position.
1031.2.2 Maintenance. Fire escape stairways and balconies shall be kept clear and unobstructed at all times and shall be main- tained in good working order.
1031.2.3 Examination. Fire escape stairways and balconies shall be examined for structural adequacy and safety by a registered design professional or other person acceptable to the fire code official every 5 years. The examination shall determine whether the fire escape stairways and balconies can support the dead load plus a live load of not less than 100 pounds per square foot (4.78 kN/m). An inspection report shall be submitted to the fire code official after such examination.
1031.3 Emergency escape and rescue openings. Emergency escape and rescue openings shall comply with Sections 1031.3.1 through 1031.3.3.
CRC § 4.2.2 High relevance — show source text
R319.4.2.2 Steps. Steps shall have an inside width of not less than 12 inches (305 mm), a minimum tread depth of 5 inches (127 mm) and a maximum riser height of 18 inches (457 mm) for the full height of the area well.
R319.4.3 Drainage. Area wells shall be designed for proper drainage by connecting to the building’s foundation drainage system required by Section R405.1.
Exception: A drainage system for area wells is not required where the foundation is on well-drained soil or sand-gravel mixture soils in accordance with the United Soil Classification System, Group I Soils, as detailed in Table R401.4.1(2).
R319.4.4 Bars, grilles, covers and screens. Where bars, grilles, covers, screens or similar devices are placed over emergency escape and rescue openings, bulkhead enclosures or area wells that serve such openings, the minimum net clear opening size shall comply with Sections R319.2 through R319.2.2 and R319.4.1. Such devices shall be releasable or removable from the inside without the use of a key or tool or force greater than that required for the normal operation of the escape and rescue opening. The release mechanism shall be maintained operable at all times.
Such bars, grills, grates or any similar devices shall be equipped with an approved exterior release device for use by the fire department only when required by the authority having jurisdiction.
Where security bars (burglar bars) are installed on emergency egress and rescue windows or doors, on or after July 1, 2000, such devices shall comply with California Building Standards Code, Part 12, Chapter 12-3 and other applicable provisions of this code.
R319.5 Replacement windows for emergency escape and rescue openings. Replacement for emergency escape and rescue openings installed in buildings meeting the scope of this code shall be exempt from Sections R319.2 and R319.4.4, provided that the replacement window meets the following conditions:
- The replacement window is the manufacturer’s largest standard size window that will fit within the existing frame or existing rough opening. The replacement window shall be permitted to be of the same operating style as the existing window or a style that provides for an equal or greater window opening area than the existing window.
- The replacement window is not part of a change of occupancy.
R319.5.1 Window opening control device and fall protection device height. Window opening control devices or fall protection devices shall be located at a height in accordance with Section R319.1.1 or at as low a height as the device can be installed within the existing clear opening.
R319.6 Dwelling additions. Where dwelling unit additions contain sleeping rooms, an emergency escape and rescue opening shall be provided in each new sleeping room. Where dwelling unit additions have basements, an emergency escape and rescue opening shall be provided in the new basement.
Exceptions:
- An emergency escape and rescue opening is not required in a new basement that contains a sleeping room with an emergency escape and rescue opening.
- An emergency escape and rescue opening is not required in a new basement where there is an emergency escape and rescue opening in an existing basement that is accessed from the new basement.
- An operable window complying with Section R319.7.1 shall be acceptable as an emergency escape and rescue opening.
CRC § 18.6 High relevance — show source text
way. 5. Basements without habitable spaces and having not more than 200 square feet (18.6 m [2] ) in floor area shall not be required to have emergency escape and rescue openings. 6. Storm shelters are not required to comply with this section where the shelter is constructed in accordance with ICC 500. 7. Within individual dwelling and sleeping units in Groups R-2 and R-3, where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 7.1. One means of egress and one emergency escape and rescue opening. 7.2. Two means of egress. 8. In Group R-2.2 occupancies a certified fire escape is acceptable as a secondary means of egress of existing buildings for this section of the code.
[BE] 1031.2.1 Operational constraints and opening control devices. Emergency escape and rescue openings and any exit doors shall be maintained free of any obstructions other than those allowed by this section and shall be operational from inside the room without the use of keys or tools. Window-opening control devices complying with ASTM F2090 shall be permitted for use on windows serving as a required emergency escape and rescue opening. The release mechanism shall be maintained operable at all times.
Such bars, grills, grates or any similar devices shall be equipped with an approved exterior release device for use by the fire department only when required by the authority having jurisdiction.
Where security bars (burglar bars) are installed on emergency egress and rescue windows or doors, on or after July 1, 2000, such devices shall comply with California Building Standards Code, Part 12, Chapter 12-3 and other applicable provisions of Part 2.
Exception: Group R-1 occupancies provided with a monitored fire sprinkler system in accordance with Section 903.2.8 and designed in accordance with NFPA 13 may have openable windows permanently restricted to a maximum 4-inch (102 mm) open position.
[California Code of Regulations, Title 19, Division 1, §4.2] Labeling.
Burglar bars shall not be sold in California at wholesale or retail unless warning information as specified in California Code of Regula- tions, Title 19, Division 1, Section 4.3 is provided either on the packaging or provided inside the packaging along with the burglar bars.
[California Code of Regulations, Title 19, Division 1, §4.3(a) through (c)] Warning Information.
(a) Warning information located on or in burglar bar packaging shall contain the following information: (1) Warning that the burglar bars are intended to deter or delay intruders, they are not intended to prevent entry. (2) A reprint of the following requirements from California Building Code, Part 2, Chapter 10: “Bars, grilles, grates or similar devices may be installed on emergency escape or rescue windows, doors or window wells or any required exit door, provided: 1. The devices are equipped with approved release mechanisms which are openable from the inside without the use of a key or special knowledge or effort; and 2. The building is equipped with smoke alarms installed in accordance with California Building Code, Part 2, Section 907.
CRC § 1031.3 High relevance — show source text
(a) Where the California Building Code requires openable burglar bars for emergency escape or rescue, or
(b) On mobile homes, manufactured homes or multi-unit manufactured housing unless at least one window or door to the exterior in each bedroom is openable for emergency escape or rescue.
[BE] 1031.3 Emergency escape and rescue openings. Emergency escape and rescue openings shall comply with Sections 1031.3.1 through 1031.3.3.
[BE] 1031.3.1 Minimum size. Emergency escape and rescue openings shall have a minimum net clear opening of 5.7 square feet (0.53 m [2] ). Exception: The minimum net clear opening for grade-floor emergency escape and rescue openings shall be 5 square feet (0.46 m [2] ).
[BE] 1031.3.2 Minimum dimensions. The minimum net clear opening height dimension shall be 24 inches (610 mm). The minimum net clear opening width dimension shall be 20 inches (508 mm). The net clear opening dimensions shall be the result of normal operation of the opening.
[BE] 1031.3.3 Maximum height from floor. Emergency escape and rescue openings shall have the bottom of the clear opening not greater than 44 inches (1118 mm) measured from the floor.
[BE] 1031.4 Emergency escape and rescue doors. Where a door is provided as the required emergency escape and rescue opening, it shall be a swinging door or a sliding door.
[BE] 1031.5 Area wells. An emergency escape and rescue opening with the bottom of the clear opening below the adjacent grade shall be provided with an area well in accordance with Sections 1031.5.1 through 1031.5.3.
[BE] 1031.5.1 Minimum size. The minimum horizontal area of the area well shall be 9 square feet (0.84 m [2] ), with a horizontal projection and width of not less than 36 inches (914 mm). The area well shall allow the emergency escape and rescue opening to be fully opened.
Exception: The ladder or steps required by Section 1031.5.2 shall be permitted to encroach not more than 6 inches (152 mm) into the required dimensions of the area well.
[BE] 1031.5.2 Ladders or steps. Area wells with a vertical depth of more than 44 inches (1118 mm) shall be equipped with an approved permanently affixed ladder or steps. The ladder or steps shall not be obstructed by the emergency escape and rescue opening when the window or door is in the open position. Ladders or steps required by this section shall not be required to comply with Section 1011.
[BE] 1031.5.2.1 Ladders. Ladders or rungs shall have an inside width of at least 12 inches (305 mm), shall project at least 3 inches (76 mm) from the wall and shall be spaced not more than 18 inches (457 mm) on center (o.c.) vertically for the full height of the area well.
[BE] 1031.5.2.2 Steps. Steps shall have an inside width of not less than 12 inches (305 mm), shall have treads greater than 5 inches (127 mm) in depth and a riser height not greater than 18 inches (457 mm) for the full height of the area well.
CRC § 9.1 High relevance — show source text
Defined R202 Chimneys Caps R1003.9.1 Clearance R1003.18 Corbeling R1003.5 Crickets R1003.20 Design (masonry) R1003.1 Factory-built R1005 Fireblocking R1003.19 Fireplaces Chapter 10 Flue area R1003.14, R1003.15 Flue lining R1003.11 Load R1003.8 Multiple flue R1003.14 Rain caps R1003.9.3 Spark arrestors R1003.9.2 Termination R1003.9
Wall thickness R1003.10
Clay Tiles R905.3
Cleanout Masonry chimney R1003.17 Climate Types R301.2 Climate Zones R202, R702.7.3, Table R702.7(5) Columns R407
2025 CALIFORNIA RESIDENTIAL CODE INDEX-1
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
INDEX
Live load R301.5
Nominal sizes R301.8
Roof load R301.6
Seismic R301.2.2
Snow loads R301.2.3 Story height R301.3 Sunrooms R301.2.1.1.1
Wind R301.2.1
Doors
Egress R318.2 Exterior R318.3, R609 Glazing R324 Draftstopping R302.12, R502.13 Drainage Foundation R405 Site drainage R300 Ducts
Defined R202 Dwelling-garage wall and ceiling penetration R302.5.2 System, definition R202 Dwelling Unit Separation R302.2, R302.3 Sprinklers (see Automatic Sprinkler System)
Electric Vehicle Charging Stations R317.6 Elevator R323.1, R323.3 Emergency Escape and Rescue Openings R319
Additions R319.6
Area wells R319.4 Bars, grilles, covers and screens R319.4.4
Basements, existing R319.7 Dimensions R319.2
Doors R319.3
Replacement window R319.5 Under decks and porches R319.2.4 Where required R319.1 Window fall protection R321.2 Emergency Housing Appendix CJ Energy Storage Systems R328 ESS vehicle impact protection Figure R330.8.1 Maximum aggregate ratings of ESS Table R330.5 Protection from impact R330.8 Toxic and highly toxic gas R330.12 Entry 1.8.5, R104.4 Existing Buildings Appendix BO Administrative R101.2, R102.6, R105.1, R105.8, R106.2, R113.1, R113.2 Basements R313.1.2, R319.7 Carbon monoxide alarms R311.2.2, R311.5, R311.6 Flood R104.3.1
CRC § 102.1 Medium relevance — show source text
Conflict 102.1, 102.4.1, 102.4.2, 104.2.4.1, 113.1, 302.2, 1302.1.2 Construction Documents 104.3, 105.3, 105.3.1, 105.4, 106, 113.4, 202, 601.2, A105.4, A205.3, A301.1, A406, A407.1 Construction Safeguards 101.5, Chapter 15 Accessibility 1511 Adjoining property 1505 Automatic sprinklers 1510 Fire extinguishers 1507 Means of egress 1508 Owner’s responsibilities 1502 Protection of pedestrians 1504 Sanitary 1503 Standpipes 1509 Water supply 1512 Corridor
Dead-end 801.4, 804.8, 1011.5.1, 1305.2.12, 1305.2.12.1, Table 1306.1 Doors 804.7.1, 1011.5.1 Exit access 801.4, 802.2.1, 802.4, 802.4.1, 901.2, 1011.8.2 Openings 804.7, 804.7.1, 804.7.2, 804.7.3, 804.7.3.1, 804.7.4, 1011.5.1,
1011.8.2
Projections 704.1.1 Rating 803.1.1, 1011.5.1, 1305.2.5, 1305.2.5.1, Table 1305.2.5, Table
1306.1
Dangerous Nonstructural 115.1, 116.1 Structural 104.4, 114.1, 117.1, 202,
302.1
Deferred Submittal 106.3.4, 106.6, 202 Definitions 202 Demolition 101.5, 104.3, 106.2.6, 108.5, 113.2, 115.5, 117, 1501.6, 1501.6.1, 1501.7, 1502.1, 1503.1, 1504.1, 1505.2 Department of Building Safety 104.2.4, 105.3, 109.3.8 Disproportionate Earthquake Damage 202, 405.2.2, 502.2
Egress (see Means of Egress) Electrical A102.1, 105.1, 105.1.1, 105.2, 108.3, 109.3.4, 202, 406, 801.3, 801.4, 806, 1007, 1101.2 Elevator 905.4, 1011.8.3, 1102.2, 1305.2.14, 1305.2.14.1, Table 1305.2.14, Table 1306.1 Emergency Escape and Rescue Openings 202, 505, 506.4, 702.4, 702.5, 702.5.1, 702.6 Emergency Power 804.6.
CRC § 2.3.1 Medium relevance — show source text
2025 CALIFORNIA RESIDENTIAL CODE APPENDIX CK-7
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX CK-8 2025 CALIFORNIA RESIDENTIAL CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
2025 CALIFORNIA RESIDENTIAL CODE APPENDIX NA-1
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX NA-2 2025 CALIFORNIA RESIDENTIAL CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
Concrete Capillary break R506.2.3.1 Compressive strength R402.2 Floors (on ground) R506 Tile (roof) R905.3 Weathering Figure R301.2(1), R402.2 Construction
3D-printed Appendix BM Cavity wall masonry R608 Cob Appendix BK Extended plate walls Appendix BN Flood-resistant R306
Floors Chapter 5 Footings R403 Foundation material R402
Foundation walls R404
Foundations Chapter 4 Hemp-lime Appendix BL Masonry R606, R607, R608, R610 Pollutant control R340 Roofs Chapter 8 Steel framing R505, R603, R804 Strawbale Appendix BJ Straw-clay Appendix BI Walls Chapter 6 Waste R334.1 Wood framing R502, R602, R802 Construction Documents R106, R306.3.9
Court Emergency escape and rescue openings R319.1, R319.2.4 Means of egress R318.1 Natural light R325.1.1 Covering Exterior R703
Interior R702 Roof Chapter 9 Wall Chapter 7 Crawl Space R408
Access R408.4
Damper Fireplace R1001.7.1 Dampproofing R406 Day Care Appendix BD Defined R202 Large family day-care homes R336 Dead Loads R301.4
Decay Protection against R304 Deck
Attachment R318.5 Supported by exterior wall R507 Wood/plastic composite boards R507.2.2
Definitions Building R202 Mechanical system R202 Plumbing R202 Design Criteria R301 Alternative provisions R301.1.1 Application R301.1 Climatic and geographic R301.2 Dead load R301.4
Deflection R301.6 Engineered design R301.1.3
Accessibility R322 Accessory Dwelling Unit R202 Authority to Enforce Automatic Fire Sprinkler Systems 1.8.9.1, R313.2 Accessory Structure Elevations R306.3.2
Energy R330.5 Exterior walls R302.1
Scope R101.2 Addition (see also Existing Buildings) Carbon monoxide alarms R311.2.2 Change of occupancy R110.1 Construction R302.2.3
Frequently asked questions
Do I have to widen an existing basement window to meet the 5.7 ft² rule?
Possibly — measure the net clear opening produced by normal operation (width × height in inches ÷ 144 = ft²). If it's less than 5.7 ft² (and not a grade‑floor opening eligible for 5.0 ft²), it must be enlarged or replaced to meet § R319.2.1.
Can I install security bars over an egress window?
Yes, but any bars, grilles, covers or screens over required emergency openings must be releasable or removable from the inside without use of a key or tool and the release must be maintained operable — see § R319.4.4.
Are replacement windows for egress held to the same dimensional rules?
Replacement windows in existing dwellings may be exempt from the new‑construction dimensional requirements if they meet the conditions in § R319.5 (largest standard size that fits existing frame, not part of a change of occupancy, etc.). Check § R319.5 before assuming exemption.
How high can I install a window‑opening control device (so kids can't fall out) and still meet egress rules?
Window‑opening control/fall‑prevention devices that comply with ASTM F2090 are permitted; when used on required egress windows they must be installed so the release mechanism is operable and the device is not installed higher than 70 in above the finished floor per § R319.1.1 (and must still allow the required net clear opening after release).
If my opening is below grade, how big must the exterior well be?
An area well must provide a minimum horizontal area of 9 ft² and a minimum horizontal projection and width of 36 in and must allow the window to be fully opened; see § R319.4.1.
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