Habitable space, rooms and egress-related definitions

Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:

• CRC § 1.1 High relevance — show source text

  SECTION R313—CEILING HEIGHT

  R313.1 Minimum height. Habitable space, hallways and portions of basements containing these spaces shall have a ceiling height of not less than 7 feet (2134 mm). Bathrooms, toilet rooms and laundry rooms shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).

  Exceptions:

  1. For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524 mm) and not less than 50 percent of the required floor area shall have a ceiling height of not less than 7 feet (2134 mm).
  2. The ceiling height above bathroom and toilet room fixtures shall be such that the fixture is capable of being used for its intended purpose. A shower or tub equipped with a showerhead shall have a ceiling height of not less than 6 feet 8 inches (2032 mm) above an area of not less than 30 inches (762 mm) by 30 inches (762 mm) at the showerhead.
  3. Beams, girders, ducts or other obstructions in basements containing habitable space shall be permitted to project to within 6 feet 4 inches (1931 mm) of the finished floor.
  4. Beams and girders spaced apart not less than 36 inches (914 mm) in clear finished width shall project not more than 78 inches (1981 mm) from the finished floor.

  R313.1.1 Basements. Portions of basements that do not contain habitable space or hallways shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).

  Exception: At beams, girders, ducts or other obstructions, the ceiling height shall be not less than 6 feet 4 inches (1931 mm) from the finished floor.

  2025 CALIFORNIA RESIDENTIAL CODE 3-59

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  BUILDING PLANNING

  R313.1.2 Habitable attics and basements in existing buildings. Where a habitable attic or habitable space in a basement is created in an existing building, ceiling height shall not be less than 6 feet 8 inches (2032 mm). Bathrooms, toilet rooms and laundry rooms shall have a ceiling height of not less than 6 feet 4 inches (1930 mm).

  Exceptions:

  1. For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524 mm) and not less than 50 percent of the required floor area shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).
  2. At beams, girders, ducts or other obstructions, the ceiling height shall be not less than 6 feet 4 inches (1930 mm) from the finished floor.

  SECTION R314—MEZZANINES

  R314.1 General. Mezzanines shall comply with Sections R314.2 through R314.5.

  Exception: Sleeping lofts in dwelling units and sleeping units shall be permitted to comply with Section R315, subject to the limitations in Section R315.2.

  R314.2 Mezzanines. The clear height above and below mezzanine floor construction shall be not less than 7 feet (2134 mm).

• CRC § 2-14 High relevance — show source text

  [MP] GRAYWATER. Waste discharged from lavatories, bathtubs, showers, clothes washers and laundry trays.

  [MP] GRIDDED WATER DISTRIBUTION SYSTEM. A water distribution system where every water distribution pipe is interconnected so as to provide two or more paths to each fixture supply pipe.

  [RB] GROSS AREA OF EXTERIOR WALLS. The normal projection of all exterior walls, including the area of all windows and doors installed therein.

  [MP] GROUND-SOURCE HEAT PUMP LOOP SYSTEM. Piping buried in horizontal or vertical excavations or placed in a body of water for the purpose of transporting heat transfer liquid to and from a heat pump. Included in this definition are closed loop systems in which the liquid is recirculated and open loop systems in which the liquid is drawn from a well or other source.

  [RB] GUARD OR GUARDRAIL . A building component or a system of building components located near the open sides of elevated walking surfaces that minimizes the possibility of a fall from the walking surface to the lower level.

  [RB] GUESTROOM. Any room or rooms used or intended to be used by one or more guests for living or sleeping purposes.

  [RB] GYPSUM BOARD. A type of gypsum panel product consisting of a noncombustible core primarily of gypsum with paper surfacing.

  [RB] GYPSUM PANEL PRODUCT. The general name for a family of sheet products consisting essentially of gypsum complying with the standards specified in Section R702.3 and Chapter 44 of this code.

  [RB] GYPSUM SHEATHING. Gypsum panel products specifically manufactured with enhanced water resistance for use as a substrate for exterior surface materials.

  [RB] GYPSUM WALLBOARD. A gypsum board used primarily as interior surfacing for building structures.

  [RB] HABITABLE SPACE. A space in a building for living, sleeping, eating or cooking. Bathrooms, toilet rooms, closets, halls, storage or utility spaces and similar areas are not considered habitable spaces.

  2-14 2025 CALIFORNIA RESIDENTIAL CODE

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  DEFINITIONS

  [RB] HANDRAIL. A horizontal or sloping rail intended for grasping by the hand for guidance or support.

  [MP] HANGERS. See “Supports.”

  [MP] HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances.

  [MP] HEAT PUMP. A refrigeration system or factory-made appliance that utilizes refrigerant to transfer heat into a space or substance.

  [RB] HEIGHT, BUILDING. The vertical distance from grade plane to the average height of the highest roof surface.

  [RB] HEIGHT, STORY. The vertical distance from top to top of two successive tiers of beams or finished floor surfaces; and, for the topmost story, from the top of the floor finish to the top of the ceiling joists or, where there is not a ceiling, to the top of the roof rafters.

  [MP] HIGH-TEMPERATURE (H.T.) CHIMNEY. A high-temperature chimney complying with the requirements of UL 103. A Type H.T. chimney is identifiable by the markings “Type H.T.” on each chimney pipe section.

• CRC § 6.9 High relevance — show source text

  R324.6.9 Testing and labeling. Unit skylights and tubular daylighting devices shall be tested by an approved independent laboratory, and bear a label identifying manufacturer, performance grade rating and approved inspection agency to indicate compliance with the requirements of AAMA/WDMA/CSA 101/I.S.2/A440.

  2025 CALIFORNIA RESIDENTIAL CODE 3-71

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  BUILDING PLANNING

  R324.6.9.1 Comparative analysis for glass-glazed unit skylights. Structural wind load design pressures for glass-glazed unit skylights different than the size tested in accordance with Section R324.6.9 shall be permitted to be different than the design value of the tested unit where determined in accordance with one of the following comparative analysis methods:

  1. Structural wind load design pressures for glass-glazed unit skylights smaller than the size tested in accordance with Section R324.6.9 shall be permitted to be higher than the design value of the tested unit provided that such higher pressures are determined by accepted engineering analysis. Components of the smaller unit shall be the same as those of the tested unit. Such calculated design pressures shall be validated by an additional test of the glass-glazed unit skylight having the highest allowable design pressure.

  2. In accordance with WDMA I.S.11.

  SECTION R325—LIGHT, VENTILATION AND HEATING

  R325.1 Habitable rooms. Habitable space shall be provided natural light and natural ventilation in accordance with Sections R325.1.1 through R325.1.3.

  R325.1.1 Natural light. Habitable rooms shall have an aggregate area of glazed openings not less than 8 percent of the floor area of such rooms. Required glazed openings shall face directly onto a street, alley or public way, or a yard or court located on the same lot as the building.

  Exceptions:

  1. Required glazed openings shall be permitted to face into a roofed porch, deck or patio adjacent to a street, alley, public way, yard or court, where there the longer side of the roofed area is not less than 65 percent unobstructed and the ceiling height is not less than 7 feet (2134 mm).

  2. Required glazed openings shall be permitted to face into a sunroom adjacent to a street, alley, public way, yard or court.

  3. Glazed openings are not required where artificial light is provided that is capable of producing an average illumination of 6 footcandles (65 lux) over the area of the room at a height of 30 inches (762 mm) above the floor level.

  4. Eave projections shall not be considered as obstructing the clear open space of a yard or court. 5. Glazed openings may open into a passive solar energy collector provided the area of exterior glazed opening(s) into the passive solar energy collector is increased to compensate for the area required by the interior space.

  R325.1.2 Natural ventilation. Habitable rooms shall have an aggregate area openable to the outdoors not less than 4 percent of the floor area of such rooms. Openings shall be through windows, skylights, doors, louvers or other approved openings to the outdoor air. Such openings shall be provided with ready access or shall otherwise be readily controllable by the building occupants.

  Exceptions:

• CRC § 0.125 High relevance — show source text

  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BF-1

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  APPENDIX BF-2 2025 CALIFORNIA RESIDENTIAL CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  BF PATIO COVERS

  The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.

  User notes:

  About this appendix: Appendix BF relaxes certain provisions contained in the body of the code as related to patio covers, including those regarding: permitted uses; exterior wall insect screens; glazing and translucent or transparent plastic; light, ventilation and emergency egress; height; structural design loads; and footings. This appendix also includes provisions that are specifically applicable to hurricane-prone regions.

  SECTION BF101—GENERAL

  BF101.1 Scope. Patio covers shall conform to the requirements of Sections BF101 through BF106.

  BF101.2 Permitted uses. Patio covers detached from or attached to dwelling units shall be used only for recreational, outdoor living purposes, and not as carports, garages, storage rooms or habitable rooms.

  SECTION BF102—DEFINITION

  BF102.1 General. The following word and term shall, for the purposes of this appendix, have the meaning shown herein.

  PATIO COVER. A structure with open or glazed walls that is used for recreational, outdoor living purposes associated with a dwelling unit.

  SECTION BF103—EXTERIOR WALLS AND OPENINGS

  BF103.1 Enclosure walls. Enclosure walls shall be permitted to be of any configuration, provided that the open or glazed area of the longer wall and one additional wall is not less than 65 percent of the area below 6 feet 8 inches (2032 mm) of each wall, measured from the floor. Openings shall be enclosed with any of the following:

  1. Insect screening.
  2. Approved translucent or transparent plastic not more than 0.125 inch (3.2 mm) in thickness.
  3. Glass conforming to the provisions of Section R324.
  4. Any combination of the foregoing.

  BF103.2 Light, ventilation and emergency egress. Exterior openings required for light and ventilation into a patio structure conforming to Section BF101 shall be unenclosed where such openings serve as emergency egress or rescue openings from sleeping rooms. Where such exterior openings serve as an exit from the dwelling unit, the patio structure, unless unenclosed, shall be provided with exits conforming to the provisions of Section R318.

  SECTION BF104—HEIGHT

  BF104.1 Height. Patio covers are limited to one-story structures not exceeding 12 feet (3657 mm) in height.

  SECTION BF105—STRUCTURAL PROVISIONS

  BF105.1 Design loads. Patio covers shall be designed and constructed to sustain, within the stress limits of this code, all dead loads plus a vertical live load of not less than 10 pounds per square foot (0.48 kN/m [2] ), except that snow loads shall be used where such snow loads exceed this minimum. Such covers shall be designed to resist the minimum wind loads set forth in Section R301.2.1.

• CRC § 1.1 High relevance — show source text

  BB TINY HOUSES

  The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.

  User notes:

  About this appendix: Appendix BB relaxes various requirements in the body of the code as they apply to houses that are 400 square feet in area or less. Attention is specifically paid to features such as compact stairs, including stair handrails and headroom, ladders, reduced ceiling heights in lofts and guard and emergency escape and rescue opening requirements at lofts.

  SECTION BB101—GENERAL

  BB101.1 Scope. This appendix shall be applicable to tiny houses used as single dwelling units. Tiny houses shall comply with this code except as otherwise stated in this appendix.

  SECTION BB102—DEFINITIONS

  BB102.1 General. The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 of this code for general definitions.

  EGRESS ROOF ACCESS WINDOW. A skylight or roof window designed and installed to satisfy the emergency escape and rescue opening requirements of Section R319.2.

  LANDING PLATFORM. A landing provided as the top step of a stairway accessing a loft.

  LOFT. A floor level located more than 30 inches (762 mm) above the main floor, open to the main floor on one or more sides with a ceiling height of less than 6 feet 8 inches (2032 mm) and used as a living or sleeping space. TINY HOUSE. A dwelling that is 400 square feet (37 m [2] ) or less in floor area excluding lofts.

  SECTION BB103—CEILING HEIGHT

  BB103.1 Minimum ceiling height. Habitable space and hallways in tiny houses shall have a ceiling height of not less than 6 feet 8 inches (2032 mm). Bathrooms, toilet rooms and kitchens shall have a ceiling height of not less than 6 feet 4 inches (1930 mm). Obstructions including, but not limited to, beams, girders, ducts and lighting, shall not extend below these minimum ceiling heights.

  Exception: Ceiling heights in lofts are permitted to be less than 6 feet 8 inches (2032 mm).

  SECTION BB104—LOFTS

  BB104.1 Minimum loft area and dimensions. Lofts used as a sleeping or living space shall meet the minimum area and dimension requirements of Sections BB104.1.1 through BB104.1.3. BB104.1.1 Minimum area. Lofts shall have a floor area of not less than 35 square feet (3.25 m [2] ).

  BB104.1.2 Minimum horizontal dimensions. Lofts shall be not less than 5 feet (1524 mm) in any horizontal dimension.

  BB104.1.3 Height effect on loft area. Portions of a loft with a sloped ceiling measuring less than 3 feet (914 mm) from the finished floor to the finished ceiling shall not be considered as contributing to the minimum required area for the loft. See Figure BB104.1.3. Exception: Under gable roofs with a minimum slope of 6 units vertical in 12 units horizontal (50-percent slope), portions of a loft with a sloped ceiling measuring less than 16 inches (406 mm) from the finished floor to the finished ceiling shall not be considered as contributing to the minimum required area for the loft.

  FIGURE BB104.1.3—HEIGHT EFFECT ON LOFT AREA

  For SI: 1 foot = 304.8 mm.

• CRC § 3-59 High relevance — show source text

  Exception: At beams, girders, ducts or other obstructions, the ceiling height shall be not less than 6 feet 4 inches (1931 mm) from the finished floor.

  2025 CALIFORNIA RESIDENTIAL CODE 3-59

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  BUILDING PLANNING

  R313.1.2 Habitable attics and basements in existing buildings. Where a habitable attic or habitable space in a basement is created in an existing building, ceiling height shall not be less than 6 feet 8 inches (2032 mm). Bathrooms, toilet rooms and laundry rooms shall have a ceiling height of not less than 6 feet 4 inches (1930 mm).

  Exceptions:

  1. For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524 mm) and not less than 50 percent of the required floor area shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).
  2. At beams, girders, ducts or other obstructions, the ceiling height shall be not less than 6 feet 4 inches (1930 mm) from the finished floor.

  SECTION R314—MEZZANINES

  R314.1 General. Mezzanines shall comply with Sections R314.2 through R314.5.

  Exception: Sleeping lofts in dwelling units and sleeping units shall be permitted to comply with Section R315, subject to the limitations in Section R315.2.

  R314.2 Mezzanines. The clear height above and below mezzanine floor construction shall be not less than 7 feet (2134 mm).

  R314.3 Area limitation. The aggregate area of a mezzanine or mezzanines shall be not greater than one-third of the floor area of the room or space in which they are located. The enclosed portion of a room shall not be included in a determination of the floor area of the room in which the mezzanine is located.

  Exception: The aggregate area of a mezzanine located within a dwelling unit equipped with an automatic sprinkler system in accordance with Section R309 shall not be greater than one-half of the floor area of the room, provided that the mezzanine meets all of the following requirements:

  1. Except for enclosed closets and bathrooms, the mezzanine is open to the room in which such mezzanine is located.
  2. The opening to the room is unobstructed except for walls not more than 42 inches (1067 mm) in height, columns, beams and posts.
  3. The exceptions to Section R314.5 are not applied.

  R314.4 Means of egress. The means of egress for mezzanines shall comply with the applicable provisions of Section R318.

  R314.5 Openness. Mezzanines shall be open and unobstructed to the room in which they are located except for walls not more than 42 inches (1067 mm) in height, columns, beams and posts.

  Exception: Mezzanines, or portions of the mezzanines, are not required to be open to the room in which they are located, provided that the enclosed spaces on the mezzanine are not greater than 10 percent of the mezzanine area.

  SECTION R315—SLEEPING LOFTS

• CRC § 2016-11 High relevance — show source text

  GROSS EXTERIOR WALL AREA is the sum of the window area, door area and exterior wall area.

  HABITABLE SPACE is space in a building for living, sleeping, eating or cooking, excluding bathrooms, toilets, hallways, storage areas, closets, utility rooms and similar areas are not considered habitable spaces. (See also “occupiable space”.)

  HABITABLE STORY is a story that contains habitable space and that has at least 50 percent of its volume above grade.

  HEALTHCARE FACILITY is a health facility as defined in the California Health and Safety Code Division 2, Chapter 2, §1250 or clinic as defined in the California Health and Safety Code Division 2, Chapter 1, Section 1204 that is located within a health facility.

  HEAT CAPACITY (HC) is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount.

  HEAT PUMP is an appliance that consists of one or more assemblies; that uses an indoor conditioning coil, a compressor, and a refrigerant-to-outdoor air heat exchanger to provide air heating; and that may also provide air cooling, dehumidifying, humidifying, circulating, or air cleaning.

  HEAT PUMP WATER HEATER (HPWH) (See “Water heater.”)

  HEATED SLAB FLOOR is a concrete floor either on-grade, raised, or a lightweight concrete slab topping. Heating is provided by a system placed within or under the slab and is sometimes referred to as a radiant slab floor.

  HEATING EQUIPMENT is equipment used to provide mechanical heating for a room or rooms in a building.

  HEATING SEASONAL PERFORMANCE FACTOR (HSPF) is the total heating output of a central air-conditioning heat pump (in Btu) during its normal use period for heating divided by the total electrical energy input (in watt-hours) during the same period, as determined using the applicable test method in the Appliance Efficiency Regulations.

  HEATING SEASONAL PERFORMANCE FACTOR 2 (HSPF2) is the HSPF metric for residential central heat pumps effective January 1, 2023, as created by the U.S. Department of Energy “ISSUANCE 2016-11-30 Energy Conservation Program: Test Procedures for Central Air Conditioners and Heat Pumps, Final Rule.”

  HIGH-RISE RESIDENTIAL BUILDING is a building, other than a hotel/motel, of occupancy Group R-2 or R-4 with four or more habitable stories.

  HORTICULTURAL LIGHTING consists of luminaires used for plant growth and maintenance. Horticultural luminaires may have either plug-in or hard-wired connections for electric power.

  HOTEL/MOTEL is a building or buildings that has six or more guest rooms or a lobby serving six or more guest rooms, where the guest rooms are intended or designed to be used, or which are used, rented or hired out to be occupied, or which are occupied for sleeping purposes by guests, and all conditioned spaces within the same building envelope. Hotel/motel includes all conditioned spaces which are (1) on the same property as the hotel/motel, (2) served by the same central heating, ventilation and air-conditioning system as the hotel/motel, and (3) integrally related to the functioning of the hotel/motel as such, including, but not limited to, exhibition facilities, meeting and conference facilities, food service facilities, lobbies and laundries. Hotel/motel also includes the following:

  A building of Occupancy Group R-1,

• CRC § 1.1.1 Medium relevance — show source text

  Exterior stairs R325.7

  Habitable rooms R325

  Interior stairs R325.6 Limited-Density Owner-Built Rural Dwellings Alternative provisions R301.1.1.1 Definition R202 Lining Flue R1003.11, R1003.12 Lintel R606.10, R608.8, R703.8.3, R1001.7 Liquid Fuel R202 Live Loads (see Loads)

  Live/work Unit R101.2 Accessibility R322.2 Loads Chimneys R1003.8 Components and Cladding (see Wind Loads) Figure R301.2.1, Table 301.2.1(1), Table 301.2.1(2) Dead load R301.4 Flood (see Flood-Resistant Construction) R301.2.4 Live load R301.5, R301.7 Roof R301.6 Seismic risk map (see Seismic Loads) Figure R301.2.2.1(1), Figure R301.2.2.1(2), Figure R301.2.2.1(3), Figure R301.2.2.1(4), Figure R301.2.2.1(5), Figure R301.2.2.1(6), Figure R301.2.2.1(7) Snow load map (see Snow Loads) Figure 301.2(3) Wind speed map (see Wind Loads) Figure R301.2(2) Lodging House R101.2, R322.1 Lumber

  Grade R502.1.1, R602.1.1, R802.1.1

  Maintenance R102.6, R303.5.3, R303.5.4 Energy R330.11 Masonry Anchorage R606.11 Cavity wall R606.13 Chases R606.8

  General R606

  Hollow unit R606.13.1.2, R606.3.2.2 Inspection R109.1.4 Seismic requirements R606.12 Veneer R703.8

  Veneer attachment R703.3

  Materials

  Alternative 1.8.7, R104.2.2 Combustible R1001.11, R1001.12, R1003.18, R1003.19 For flue liners R1003.11

  For hearth extension R1001.9 For siding R703.5 Means of Appeal R112 Board of appeals Appendix AA Means of Egress R318 Attachment of landings, decks, balconies and stairs R318.5

  Door R318.2 Floors and landings at exterior doors R318.3 Hallways R318.6 Mezzanines R314.4

  Ramps R318.8 Sleeping lofts R315.5 Stairways R318.7 Vertical egress R318.4 Mechanical

  Inspection R109.1.2 Membrane Polyethylene R504.2.2, R506.3.3 Waterproofing R406.2 Water-resistive R703.2

  Metal Roof panels R905.10

  2025 CALIFORNIA RESIDENTIAL CODE INDEX-3

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  INDEX

• CRC § 4.1. Medium relevance — show source text

  The building shall only be used for ESS, electrical energy generation and other electrical grid-related operations. 2. Occupants in the rooms and areas containing ESS are limited to personnel that operate, maintain, service, test and repair the ESS and other energy systems. 3. No other occupancy types shall be permitted in the building. 4. Administrative and support personnel shall be permitted in areas within the buildings that do not contain ESS, provided that: 4.1. The areas do not occupy more than 10 percent of the building area of the story in which they are located. 4.2. A means of egress is provided from the incidental use areas to the public way that does not require occupants to traverse through areas containing ESS or other energy system equipment. (Material based on NFPA 855 2023 Ed.)

  1207.7.2 Nondedicated-use buildings. For the purpose of Table 1207.7, nondedicated-use buildings include all buildings that contain ESS and do not comply with Section 1207.7.1 dedicated-use building requirements. (Material based on NFPA 855 2023 Ed.)

  1207.7.3 Dwelling units and sleeping units. ESS shall not be installed in sleeping units or in habitable spaces of dwelling units. (Material based on NFPA 855 2023 Ed.)

  1207.7.4 Fire-resistance-rated separations. Rooms and areas containing ESS shall include fire-resistance-rated separations as follows:

  1. In dedicated-use buildings, rooms and areas containing ESS shall be separated from areas in which administrative and support personnel are located.
  2. In nondedicated-use buildings, rooms and areas containing ESS shall be separated from other areas in the building.

  Separation shall be provided by 2-hour fire barriers constructed in accordance with Section 707 of the California Building Code and 2-hour horizontal assemblies constructed in accordance with Section 711 of the California Building Code, as appropriate. (Material based on NFPA 855 2023 Ed.)

  1207.8 Outdoor installations. Outdoor installations shall be in accordance with Sections 1207.8.1 through 1207.8.3. Exterior wall installations for individual ESS units not exceeding 20 kWh shall be in accordance with Section 1207.8.4. (Material based on NFPA 855 2023 Ed.)

  2025 CALIFORNIA FIRE CODE 12-19

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  ENERGY SYSTEMS

• CRC § 1208.2.1 Medium relevance — show source text

  1208.2.1 Furred ceiling. Any room with a furred ceiling shall be required to have the minimum ceiling height in two-thirds of the area thereof, but in no case shall the height of the furred ceiling be less than 7 feet (2134 mm). 1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m [2] ) of habitable space. 1208.4 Room area. Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m [2] ) of net floor area. Sleeping units and other habitable rooms of a dwelling unit shall have a net floor area of not less than 70 square feet (6.5 m [2] ).

  Exception: Kitchens are not required to be of a minimum floor area.

  1208.5 Efficiency dwelling units. [HCD 1] Unless modified by local ordinance pursuant to Health and Safety Code Section 17958.1, effi- ciency dwelling units shall comply with the following:

  1. The unit’s habitable space shall comply with Sections 1208.1 through 1208.4.
  2. The unit shall be provided with a separate closet.
  3. For other than Accessible, adaptable dwelling units, the unit shall be provided with a kitchen sink, cooking appliance and refrigerator, each having a clear working space of not less than 30 inches (762 mm) in front. Light and ventilation conforming to this code shall be provided.
  4. The unit shall be provided with a separate bathroom containing a water closet, lavatory and bathtub or shower.

  SECTION 1209—ACCESS TO UNOCCUPIED SPACES

  1209.1 Crawl spaces. Crawl spaces shall be provided with not less than one access opening that shall be not less than 18 inches by 24 inches (457 mm by 610 mm).

  1209.1.1 [SPCB] Accessible under-floor areas shall be provided with an 18-inch by 24-inch (457 mm by 610 mm) access crawl hole. Pipes, ducts and other nonstructural construction shall not interfere with the accessibility to or within under-floor areas.

  1209.2 Attic spaces. An opening not less than 20 inches by 30 inches (559 mm by 762 mm) shall be provided to any attic area having a clear height of over 30 inches (762 mm). Clear headroom of not less than 30 inches (762 mm) shall be provided in the attic space at or above the access opening.

  1209.3 Mechanical appliances. Access to mechanical appliances installed in under-floor areas, in attic spaces and on roofs or elevated structures shall be in accordance with the California Mechanical Code .

  SECTION 1210—TOILET AND BATHROOM REQUIREMENTS

  [P] 1210.1 Required fixtures. The number and type of plumbing fixtures provided in any occupancy shall comply with the California Plumbing Code.

  [P] 1210.2 Finish materials. Walls, floors and partitions in toilet and bathrooms shall comply with Sections 1210.2.1 through 1210.2.5.

  [OSHPD 1, 2, 3 & 5] Facilities subject to OSHPD 1, 2, 3 & 5 shall also comply with Section 1224.4.11.

• CRC § 103.2 Medium relevance — show source text

  Adopting agency	BSC	BSC- CG	SFM	HCD	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
  Adopting agency	BSC	BSC- CG	SFM	1	2	1/AC	AC	SS	SS/CC	1	1R	2	3	4	5	5	5	5	5	5	5	5	5
  Adopt entire chapter			X	X
  Adopt entire chapter as amended (amended sections listed below)
  Adopt only those sections that are listed below
  Chapter / Section
  103.2			X

  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BF-1

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  APPENDIX BF-2 2025 CALIFORNIA RESIDENTIAL CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  BF PATIO COVERS

  The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.

  User notes:

  About this appendix: Appendix BF relaxes certain provisions contained in the body of the code as related to patio covers, including those regarding: permitted uses; exterior wall insect screens; glazing and translucent or transparent plastic; light, ventilation and emergency egress; height; structural design loads; and footings. This appendix also includes provisions that are specifically applicable to hurricane-prone regions.

  SECTION BF101—GENERAL

  BF101.1 Scope. Patio covers shall conform to the requirements of Sections BF101 through BF106.

  BF101.2 Permitted uses. Patio covers detached from or attached to dwelling units shall be used only for recreational, outdoor living purposes, and not as carports, garages, storage rooms or habitable rooms.

  SECTION BF102—DEFINITION

  BF102.1 General. The following word and term shall, for the purposes of this appendix, have the meaning shown herein.

  PATIO COVER. A structure with open or glazed walls that is used for recreational, outdoor living purposes associated with a dwelling unit.

  SECTION BF103—EXTERIOR WALLS AND OPENINGS

• CRC § 2-23 Medium relevance — show source text

  [BE] GUARD. A building component or a system of building components located at or near the open sides of elevated walking surfaces that minimizes the possibility of a fall from the walking surface to a lower level.

  [BG] GUESTROOM. A room used or intended to be used by one or more guests for living or sleeping purposes.

  [BS] GYPSUM BOARD. A type of gypsum panel product consisting of a noncombustible core primarily of gypsum with paper surfacing.

  [BS] GYPSUM WALLBOARD. A gypsum board used primarily as an interior surfacing for building structures.

  [BG] HABITABLE SPACE. A space in a building for living, sleeping, eating or cooking. Bathrooms, toilet rooms, closets, halls, storage or utility spaces and similar areas are not considered habitable spaces.

  HALOGENATED EXTINGUISHING SYSTEM. A fire-extinguishing system using one or more atoms of an element from the halogen chemical series: fluorine, chlorine, bromine and iodine.

  HANDLING. The deliberate transport by any means to a point of storage or use.

  [BE] HANDRAIL. A horizontal or sloping rail intended for grasping by the hand for guidance or support.

  HAZARDOUS MATERIALS. Those chemicals or substances which are physical hazards or health hazards as defined and classified in this chapter, whether the materials are in usable or waste condition.

  HAZARDOUS PRODUCTION MATERIAL (HPM). A solid, liquid or gas associated with semiconductor manufacturing that has a degreeof-hazard rating in health, flammability or instability of Class 3 or 4 as ranked by NFPA 704 and which is used directly in research, laboratory or production processes which have, as their end product, materials that are not hazardous.

  HEALTH HAZARD. A classification of a chemical for which there is statistically significant evidence that acute or chronic health effects are capable of occurring in exposed persons. The term “health hazard” includes chemicals that are toxic, highly toxic and corrosive.

  HEAT DETECTOR. See “Detector, heat.”

  [BG] HEIGHT, BUILDING. The vertical distance from grade plane to the average height of the highest roof surface.

  HELIPORT. An area of land or water or a structural surface that is used, or intended for use, for the landing and taking off of helicopters, and any appurtenant areas which are used, or intended for use, for heliport buildings and other heliport facilities.

  HELISTOP. The same as “Heliport,” except that fueling, defueling, maintenance, repairs or storage of helicopters is not permitted.

  HI-BOY. A cart used to transport hot roofing materials on a roof.

  2025 CALIFORNIA FIRE CODE 2-23

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  DEFINITIONS

  HIGHER EDUCATION LABORATORY. Laboratories in Group B occupancies used for educational purposes above the 12th grade. Storage, use and handling of chemicals in such laboratories shall be limited to purposes related to testing, analysis, teaching, research or developmental activities on a nonproduction basis.

  HIGHLY TOXIC. A material which produces a lethal dose or lethal concentration which falls within any of the following categories: 1.