CRC · California Residential Code
What electrical provisions apply to emergency housing or transportable units?
If your jurisdiction has adopted Appendix CJ, emergency sleeping cabins must have a continuous power source (utility, generator, or solar/wind), at least one interior light, at least one GFCI‑protected receptacle for occupants, and listed electric heating with a dedicated receptacle unless you provide non‑electric heat; transportable units must also meet Health & Safety Code and Title 25 rules.
Last reviewed: July 6, 2026
What the code requires — 2-4 sentences
Emergency sleeping cabins must be provided with a continuous source of electricity, at least one interior lighting fixture, electrical heating equipment listed for residential use with a dedicated receptacle (unless a non‑electrical heating source is provided), and at least one GFCI‑protected receptacle outlet for occupant use. These particular electrical requirements are stated in § CJ104.6 of the California Residential Code and must be installed in compliance with the California Electrical Code. § CJ105.1 additionally requires that emergency transportable housing units (manufactured homes, mobilehomes, RVs, park trailers, etc.) meet the applicable Health & Safety and Title 25 requirements.
The single most important rule: emergency sleeping cabins must have a continuous power source, basic interior lighting, occupant GFCI protection, and listed residential electrical heating (or an approved non‑electrical heat source) — installed per the California Electrical Code.
Requirements in detail
Core electrical items required by § CJ104.6
- Continuous source of electricity — provided on an ongoing basis; the code allows the source to be an emergency generator or renewable source (solar/wind) as an exception. § CJ104.6 requires the power to be installed in compliance with the California Electrical Code.
- At least one interior lighting fixture — minimum required lighting inside the sleeping unit. § CJ104.6.
- Electrical heating equipment listed for residential use plus a dedicated receptacle outlet for that heating equipment — unless a non‑electrical source of heating is provided, in which case the listed electrical heating and dedicated receptacle are not required. § CJ104.6.
- At least one GFCI‑protected receptacle outlet for occupant use. § CJ104.6.
Decision‑relevant summary table
| Decision item | Required value / action | Code Reference |
|---|---|---|
| Continuous power | Required; may be utility, emergency generator, or renewable source | § CJ104.6 |
| Interior lighting | Minimum: at least one interior lighting fixture | § CJ104.6 |
| Heating (electric) | If electric heating used: equipment must be listed for residential use and have a dedicated receptacle; not required if non‑electrical heating provided | § CJ104.6 |
| Receptacles (occupant use) | At least one GFCI‑protected receptacle outlet required | § CJ104.6 |
| Transportable units (manufactured, mobilehome, RV, park trailer, etc.) | Must also comply with Health & Safety Code Division 13, Part 2 and Title 25, Division 1, Ch. 3, Subch. 2 (as applicable) | § CJ105.1 |
Installation standard
All items listed in § CJ104.6 must be "installed in compliance with the California Electrical Code" — that means installation methods, circuit protection, grounding, bonding, and any required disconnects follow the CEC rules and local enforcing‑agency interpretations. § CJ104.6.
Exceptions & special cases
- Exception for the power source: the required continuous source of electricity may be an emergency generator or a renewable source (solar/wind) instead of permanent utility service (see § CJ104.6).
- Exception for heating: electrical heating equipment and its dedicated receptacle are not required if a non‑electrical heating source is provided (see § CJ104.6).
- Appendix adoption: the Appendix CJ provisions apply when the local adopting ordinance references them; the appendix text includes a prefatory note that these provisions are not mandatory unless adopted by the enforcing jurisdiction — verify local adoption before assuming mandatory applicability. (Prefatory text to Appendix CJ)
- Emergency transportable housing units are still subject to other regulatory regimes: § CJ105.1 directs manufactured homes, mobilehomes, multifamily manufactured homes, commercial modulars, recreational vehicles and park trailers used as emergency transportable housing to comply with the Health & Safety Code and Title 25 requirements as applicable. This means additional electrical, plumbing, and appliance rules may apply beyond § CJ104.6.
Common mistakes
- Assuming the appendix is automatically mandatory statewide. The Appendix CJ text is adopted locally; always confirm whether your jurisdiction has adopted Appendix CJ before enforcing it.
- Forgetting the CEC connection: § CJ104.6 requires installation "in compliance with the California Electrical Code" — specifying requirements but leaving methods (wire sizing, breaker sizing, grounding, GFCI location) to the CEC. Do not treat § CJ104.6 as substituting for wiring methods in the CEC.
- Omitting GFCI protection: the code requires at least one GFCI‑protected receptacle for occupant use — do not rely solely on non‑GFCI outlets. § CJ104.6.
- Supplying heating that is not listed for residential use or failing to provide the required dedicated receptacle when electric heating is provided. § CJ104.6.
- Treating recreational vehicles or mobilehomes as exempt: transportable units must also follow Health & Safety Code and Title 25 where applicable per § CJ105.1.
Worked example — concrete scenario
Scenario: A jurisdiction has adopted Appendix CJ. You will place an emergency sleeping cabin that is 10 ft × 12 ft (120 ft²) for short‑term shelter.
Step 1 — Occupant planning: Minimum interior floor area rules in the appendix require not less than 70 ft² for one occupant and add 50 ft² for each additional occupant (see § CJ103.3). For 120 ft² this allows up to two occupants (70 + 50 = 120). Use this occupant count to size life‑safety planning.
Step 2 — Electrical items to install (per § CJ104.6):
- Provide a continuous source of electricity. You may connect to utility service or provide an emergency generator or solar system as the source (exception allowed). Ensure interconnection and installation meet the California Electrical Code.
- Install at least one interior lighting fixture (e.g., a ceiling fixture wired per the CEC).
- If you choose electric heating, install heating equipment listed for residential use and supply it with a dedicated receptacle outlet (a separate circuit or outlet dedicated for the heater). If instead you provide a non‑electrical heater (e.g., approved propane or central heating source), the listed electrical heating and dedicated receptacle are not required.
- Provide at least one GFCI‑protected receptacle accessible to the occupant(s) (this satisfies the “at least one” requirement regardless of whether you have 1 or 2 occupants in this cabin).
Step 3 — Follow the CEC for conductor sizing, overcurrent protection, GFCI device location, grounding, bonding, and any required disconnects. § CJ104.6 delegates the installation practices to the California Electrical Code.
Related provisions
- § CJ103.3 — Occupant load and minimum interior floor area (70 ft² for first occupant; +50 ft² for each additional).
- § CJ104.7 — Ventilation requirements for emergency sleeping cabins (natural and/or mechanical as determined by the enforcing agency).
- § CJ104.8 — Smoke alarm requirement (at least one smoke alarm installed per Section R314).
- § CJ104.9 — Carbon monoxide alarm requirement when fuel‑burning appliances are present (per Section R315).
- § CJ105.1 — Emergency transportable housing units must also comply with applicable Health & Safety Code and Title 25 requirements.
- Prefatory note to Appendix CJ — The appendix provisions are not mandatory unless specifically adopted by the enforcing jurisdiction (prefatory text to Appendix CJ).
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
CRC § 4.1 High relevance — show source text
CJ104.4.1 Egress window. The bottom of the clear opening of the egress window shall not be more than 44 inches (1118 mm) above the floor. The egress window shall have a minimum net clear opening height of 24 inches (610 mm), and a minimum net clear opening width of 20 inches (508 mm). The egress window shall have a minimum net clear opening area of 5 square feet (0.465 m [2] ).
CJ104.5 Plumbing and gas service. If an emergency sleeping cabin contains plumbing or gas service, it shall comply with all applicable requirements of the California Plumbing Code and the California Mechanical Code.
CJ104.6 Electrical. Emergency sleeping cabins shall be provided with all of the following installed in compliance with the California Electrical Code:
1. Continuous source of electricity. Exception: The source of electricity may be an emergency generator or renewable source of power such as solar or wind
power.
APPENDIX CJ-4 2025 CALIFORNIA RESIDENTIAL CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX CJ — EMERGENCY HOUSING
2. At least one interior lighting fixture. 3. Electrical heating equipment listed for residential use and a dedicated receptacle outlet for the electrical heating equipment. Exception: Electrical heating equipment and a dedicated receptacle outlet for the electrical heating equipment are not required if non-electrical source of heating is provided. 4. At least one GFCI-protected receptacle outlet for use by the occupant(s).
CJ104.7 Ventilation. Emergency sleeping cabins shall be provided with means of ventilation (natural and/or mechanical) allowing for adequate air replacement, as determined by the enforcing agency.
CJ104.8 Smoke alarms. Emergency sleeping cabins shall be provided with at least one smoke alarm installed in accordance with Section R314.
CJ104.9 Carbon monoxide alarms. If an emergency sleeping cabin contains a fuel-burning appliance(s) or a fireplace(s), a carbon monoxide alarm shall be installed in accordance with Section R315.
SECTION CJ105—EMERGENCY TRANSPORTABLE HOUSING UNITS
CJ105.1 General. In addition to the requirements in this appendix, manufactured homes, mobilehomes, multifamily manufactured homes, commercial modulars, recreational vehicles and park trailers used as emergency transportable housing shall comply with all applicable requirements in the Health and Safety Code, Division 13, Part 2; and Title 25, Division 1, Chapter 3, Subchapter 2.
SECTION CJ106—TENTS AND MEMBRANE STRUCTURES
CJ106.1 General. Tents shall not be used to house occupants for more than 7 days unless such tents are maintained with tight wooden floors raised at least 4 inches (101.6 mm) above the ground level and are equipped with baseboards on all sides to a height of at least 6 inches (152.4 mm). Tents may be maintained with concrete slabs with the finished surface at least 4 inches (101.6 mm) above grade and equipped with curbs on all sides at least 6 inches (152.4 mm) high.
CRC § 101.6 High relevance — show source text
Q104.6 Electrical. Emergency sleeping cabins shall be provided with all of the following installed in compliance with the California Elec- trical Code:
1. Continuous source of electricity. Exception: The source of electricity may be an emergency generator or renewable source of power such as solar or wind
power.
2025 CALIFORNIA BUILDING CODE APPENDIX Q-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX Q—EMERGENCY HOUSING
2. At least one interior lighting fixture. 3. Electrical heating equipment listed for residential use and a dedicated receptacle outlet for the electrical heating equipment. Exception: Electrical heating equipment and a dedicated receptacle outlet for the electrical heating equipment are not required if a nonelectrical source of heating is provided. 4. At least one GFCI-protected receptacle outlet for use by the occupant(s).
Q104.7 Ventilation. Emergency sleeping cabins shall be provided with means of ventilation (natural and/or mechanical) allowing for adequate air replacement, as determined by the enforcing agency.
Q104.8 Smoke alarms. Emergency sleeping cabins shall be provided with at least one smoke alarm installed in accordance with the California Residential Code, Section R314.
Q104.9 Carbon monoxide alarms. If an emergency sleeping cabin contains a fuel-burning appliance(s) or a fireplace(s), a carbon monoxide alarm shall be installed in accordance with the California Residential Code, Section R315.
SECTION Q105—EMERGENCY TRANSPORTABLE HOUSING UNITS
Q105.1 General. In addition to the requirements in this appendix, manufactured homes, mobilehomes, multifamily manufactured homes, commercial modulars, recreational vehicles and park trailers used as emergency transportable housing shall comply with all applicable requirements in the Health and Safety Code, Division 13, Part 2; and Title 25, Division 1, Chapter 3, Subchapter 2.
SECTION Q106—TENTS AND MEMBRANE STRUCTURES
Q106.1 General. Tents shall not be used to house occupants for more than 7 days unless such tents are maintained with tight wooden floors raised at least 4 inches (101.6 mm) above the ground level and are equipped with baseboards on all sides to a height of at least 6 inches (152.4 mm). Tents may be maintained with concrete slabs with the finished surface at least 4 inches (101.6 mm) above grade and equipped with curbs on all sides at least 6 inches (152.4 mm) high.
A tent shall not be considered a suitable sleeping place when it is found necessary to provide heating facilities in order to maintain a minimum temperature of 50 degrees Fahrenheit (10 degrees Celsius) within such tent during the period of occupancy.
Membrane structures installed and/or assembled in accordance with Chapter 31 of this code, may be permitted to be used as emer- gency housing and emergency housing facilities, as determined by the enforcing agency.
SECTION Q107—ACCESSIBILITY
Q107.1 General. Emergency housing shall comply with the applicable requirements in Chapter 11B and/or the US Access Board Final Guidelines for Emergency Transportable Housing.
CRC § 517.34. High relevance — show source text
12. Transformers.
13. Electrical substations.
14. UPS and batteries.
15. Panelboards as defined in the California Electrical Code (CEC) Article 100. 16. Industrial control panels as defined in the California Electrical Code (CEC) Article 100. 17. Power isolation and correction systems. 18. Motorized surgical lighting systems. 19. Motorized operating table systems. 20. Internal communication servers, routers and switches failure of which could impair the continued operation of the facility. 21. Medical gas and vacuum systems. 22. Electrical busways as defined in UL 857. 23. Electrical control panels powered by the life safety branch in accordance with the California Electrical Code (CEC) Article 517.33 or the critical branch in accordance with the California Electrical Code (CEC) Article 517.34.
Exceptions: 1. Equipment and components weighing not more than 75 lbs. rigidly attached to structures or surface mounted on equipment or components that are not required to have special seismic certification by this section. 2. Mobile equipment/components. 3. Pipes, ducts, conduits and cable trays, excluding in-line equipment and components. 4. Underground tanks. 5. Electric motors, base-mounted horizontal pumps and compressors. 6. Based-mounted vertical pumps up to 20 hp. 7. Substitution of certified active subcomponents up to operating weight of 10 lbs. 8. Components where importance factor, I p , is permitted to be 1.0 by this code. 9. Emergency generators up to 25 kilowatts. 10. Equipment and components used for clinical trials only. 11. Elevator machines and governors. 12. Temporary and Interim equipment.
For Exceptions 5, 6 and 7:
Exempt subcomponents, which are an integral part of equipment that require special seismic certification, shall be tested attached to the equipment. Exempt subcomponents shall be permitted to be substituted without testing, provided that the substituted subcomponent relative to the certified subcomponent has: 1. Similar configuration with equivalent function. 2. Supports and attachments of similar configuration with equivalent strength and stiffness.
3. Same attachment location.
2025 CALIFORNIA BUILDING CODE 17A-19
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
�
�
SPECIAL INSPECTIONS AND TESTS
4. Changes in dimensions, center of gravity and mass, of not more than 10 percent of the certified subcomponent and still meets Exception 5, 6 or 7. 5. Manufacturing process with ISO 9001 certification.
1705 A .14.4 Seismic isolation and damping systems. Seismic isolation and damping systems in structures assigned to Seismic Design Category D, E or F shall be tested in accordance with Section 17.8 and 18.6 of ASCE 7.
Prototype and production testing and associated acceptance criteria for isolator units and damping devices shall be subject to preapproval by the building official. Testing exemption for similar units shall require approval by the building official.
CRC § 18001.8 High relevance — show source text
2025 CALIFORNIA BUILDING CODE APPENDIX Q-1
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
EMERGENCY HOUSING
The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.
SECTION Q101—GENERAL
Q101.1 Scope. This appendix shall be applicable to emergency housing and emergency housing facilities, as defined in Section Q102.
SECTION Q102—DEFINITIONS
Q102.1 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.
DECLARATION OF SHELTER CRISIS. The duly proclaimed existence of a situation in which a significant number of persons are without the ability to obtain shelter, resulting in a threat to their health and safety. (See Government Code Section 8698.)
DEPENDENT UNIT. Emergency housing not equipped with a kitchen area, toilet and sewage disposal system. Recreational vehicles that are not self-contained and without utility service connections shall be considered dependent units.
EMERGENCY HOUSING. Housing in a permanent or temporary structure(s), occupied during a declaration of state of emergency, local emergency or shelter crisis. Emergency housing may include, but is not limited to, buildings and structures constructed in accordance with the California Building Standards Code; and emergency sleeping cabins, emergency transportable housing units and tents constructed in accordance with this appendix.
EMERGENCY HOUSING FACILITIES. On-site common use facilities supporting emergency housing. Emergency housing facilities include, but are not limited to, kitchen areas, toilets, showers and bathrooms with running water. The use of emergency housing facilities is limited exclusively to the occupants of the emergency housing, personnel involved in operating the housing and other emergency personnel.
EMERGENCY HOUSING SITE. A site containing emergency housing and emergency housing facilities supporting the emergency housing.
EMERGENCY SLEEPING CABIN . Relocatable hard-sided structure constructed in accordance with this appendix, which may be occupied only for emergency housing if allowed by the enforcing agency.
EMERGENCY TRANSPORTABLE HOUSING UNIT. A single- or multiple-section prefabricated structure that is transportable by a vehicle and that can be installed on a permanent or temporary site in response to a need for emergency housing. Emergency transportable housing units include, but are not limited to, manufactured homes, mobilehomes, multifamily manufactured homes, recreational vehi- cles and park trailers. For the purposes of this appendix, emergency transportable housing units may also include commercial modulars as defined in the Health and Safety Code Section 18001.8, if approved by the enforcing agency.
Emergency transportable housing units do not include factory-built housing as defined in the Health and Safety Code Section 19971.
LANDING PLATFORM. A landing provided as the top step of a stairway accessing a loft.
LOCAL EMERGENCY. Local Emergency as defined in the Government Code, Section 8558.
LOFT. A floor level located more than 30 inches (762 mm) above the main floor and open to it on at least one side with a ceiling height of less than 6 feet 8 inches (2032 mm), used as a living or sleeping space.
CRC § 2.1 High relevance — show source text
SECTION CJ103—EMERGENCY HOUSING
CJ103.1 General. Emergency sleeping cabins, emergency transportable housing units, membrane structures and tents constructed and/or assembled in accordance with this appendix, shall be occupied only during declaration of state of emergency, local emergency or shelter crisis.
2025 CALIFORNIA RESIDENTIAL CODE APPENDIX CJ-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX CJ — EMERGENCY HOUSING
Buildings and structures constructed in accordance with the California Building Standards Code, used as emergency housing, shall be permitted to be permanently occupied.
CJ103.2 Existing buildings. Existing residential and nonresidential buildings or structures shall be permitted to be used as emergency housing and emergency housing facilities provided such buildings or structures comply with the building code provisions and/or other regulations in effect at the time of original construction and/or alteration. Existing buildings or structures used as emergency housing shall not become or continue to be substandard buildings, as determined by the enforcing agency.
CJ103.2.1 New additions, alterations and change of occupancy. New additions, alterations and change of occupancy to existing buildings shall comply with the requirements of the California Building Standards Code effective at the time of addition, alteration or change of occupancy. The requirements shall apply only to and/or within the specific area of the addition, alteration or change of
occupancy.
Exception: Existing buildings and structures used for emergency housing and emergency housing facilities may not be required to comply with the California Energy Code, as determined by the enforcing agency.
CJ103.3 Occupant load. Except as otherwise stated in this appendix, the maximum occupant load allowed in buildings and structures used as emergency housing shall be determined by the enforcing agency, but the interior floor area shall not be less than 70 square feet (6.5 m [2] ) for one occupant. Where more than one person occupies the building/structure, the required floor area shall be increased at the rate of 50 square feet (4.65 m [2] ) for each occupant in excess of one.
Exceptions:
1. Tents.
2. Recreational vehicles and park trailers designed for human habitation that meet the requirements in the Health and Safety Code, Sections 18009.3 and 18010, as applicable. 3. For emergency housing, including emergency sleeping cabins, the minimum interior floor area may be reduced to 53 square feet (4.9 m [2] ) if the enforcing agency determines that 53 square feet (4.9 m [2] ) is adequate space for a single-occupancy sleep- ing unit.
CJ103.4 Fire and life safety requirements not addressed in this appendix. If not otherwise addressed in this appendix, fire and life safety measures, including, but not limited to, means of egress, fire separation, fire sprinklers, smoke alarms and carbon monoxide alarms, shall be determined and enforced by the enforcing agency.
CJ103.5 Privacy. Emergency housing shall be provided with a privacy lock on each entrance door and all windows for use by the occupants.
CJ103.6 Heating. All sleeping areas shall be provided with adequate heating as determined by the enforcing agency.
CRC § 4.1. High relevance — show source text
Q104.3 Minimum ceiling height. Habitable space and hallways in emergency sleeping cabins shall have a ceiling height of not less than 80 inches (2032 mm). Bathrooms, toilet rooms and kitchens, if provided, shall have a ceiling height of not less than 76 inches (1930 mm). Obstructions shall not extend below these minimum ceiling heights including beams, girders, ducts, lighting and other obstructions.
Exception: Ceiling heights in lofts constructed in accordance with Section Q108 are permitted to be less than 80 inches (2032 mm).
Q104.4 Means of egress. Emergency sleeping cabins shall be provided with at least two forms of egress placed remotely from each other. One form of egress may be an egress window complying with Section Q104.4.1. When a loft is provided, one form of egress shall be an egress window complying with Section Q104.4.1, provided in the loft space.
Q104.4.1 Egress window. The bottom of the clear opening of the egress window shall not be more than 44 inches (1118 mm) above the floor. The egress window shall have a minimum net clear opening height of 24 inches (610 mm), and a minimum net clear opening width of 20 inches (508 mm). The egress window shall have a minimum net clear opening area of 5 square feet (0.465 m [2] ).
Q104.5 Plumbing and gas service. If an emergency sleeping cabin contains plumbing or gas service, it shall comply with all applicable requirements of the California Plumbing Code and the California Mechanical Code.
Q104.6 Electrical. Emergency sleeping cabins shall be provided with all of the following installed in compliance with the California Elec- trical Code:
1. Continuous source of electricity. Exception: The source of electricity may be an emergency generator or renewable source of power such as solar or wind
power.
2025 CALIFORNIA BUILDING CODE APPENDIX Q-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX Q—EMERGENCY HOUSING
2. At least one interior lighting fixture. 3. Electrical heating equipment listed for residential use and a dedicated receptacle outlet for the electrical heating equipment. Exception: Electrical heating equipment and a dedicated receptacle outlet for the electrical heating equipment are not required if a nonelectrical source of heating is provided. 4. At least one GFCI-protected receptacle outlet for use by the occupant(s).
Q104.7 Ventilation. Emergency sleeping cabins shall be provided with means of ventilation (natural and/or mechanical) allowing for adequate air replacement, as determined by the enforcing agency.
Q104.8 Smoke alarms. Emergency sleeping cabins shall be provided with at least one smoke alarm installed in accordance with the California Residential Code, Section R314.
Q104.9 Carbon monoxide alarms. If an emergency sleeping cabin contains a fuel-burning appliance(s) or a fireplace(s), a carbon monoxide alarm shall be installed in accordance with the California Residential Code, Section R315.
SECTION Q105—EMERGENCY TRANSPORTABLE HOUSING UNITS
CRC § 18001.8 High relevance — show source text
EMERGENCY HOUSING SITE. A site containing emergency housing and emergency housing facilities supporting the emergency housing.
EMERGENCY SLEEPING CABIN . Relocatable hard-sided structure constructed in accordance with this appendix, which may be occupied only for emergency housing if allowed by the enforcing agency.
EMERGENCY TRANSPORTABLE HOUSING UNIT. A single- or multiple-section prefabricated structure that is transportable by a vehicle and that can be installed on a permanent or temporary site in response to a need for emergency housing. Emergency transportable housing units include, but are not limited to, manufactured homes, mobilehomes, multifamily manufactured homes, recreational vehi- cles and park trailers. For the purposes of this appendix, emergency transportable housing units may also include commercial modulars as defined in the Health and Safety Code Section 18001.8, if approved by the enforcing agency.
Emergency transportable housing units do not include factory-built housing as defined in the Health and Safety Code Section 19971.
LANDING PLATFORM. A landing provided as the top step of a stairway accessing a loft.
LOCAL EMERGENCY. Local Emergency as defined in the Government Code, Section 8558.
LOFT. A floor level located more than 30 inches (762 mm) above the main floor and open to it on at least one side with a ceiling height of less than 6 feet 8 inches (2032 mm), used as a living or sleeping space.
MANUFACTURED HOME. A structure designed to be used as a single-family dwelling, as defined in the Health and Safety Code, Section 18007.
MEMBRANE STRUCTURE. An air-inflated, air-supported, cable or frame-covered structure, not otherwise defined as a tent. (See Chapter 31 of this code.)
MOBILEHOME. A structure designed to be used as a single-family dwelling, as defined in the Health and Safety Code, Section 18008.
MULTIFAMILY MANUFACTURED HOME. A structure designed to contain not less than two dwelling units, as defined in the Health and Safety Code, Section 18008.7.
PARK TRAILER. A trailer designed for human habitation that meets all requirements in the Health and Safety Code, Section 18009.3.
RECREATIONAL VEHICLE. A motor home, travel trailer, truck camper or camping trailer, with or without motive power, designed for human habitation, that meets all requirements in the Health and Safety Code, Section 18010.
STATE OF EMERGENCY. State of Emergency as defined in the Government Code, Section 8558.
TENT. A structure, enclosure or shelter, with or without sidewalls or drops, constructed of fabric or pliable material supported by any manner except by air or the contents that it protects.
SECTION Q103 — EMERGENCY HOUSING
Q103.1 General. Emergency sleeping cabins, emergency transportable housing units, membrane structures and tents constructed and/ or assembled in accordance with this appendix, shall be occupied only during declaration of state of emergency, local emergency or shelter crisis.
APPENDIX Q-2 2025 CALIFORNIA BUILDING CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
CRC § 6.4 High relevance — show source text
6.4|Yes|Yes|No|No|No|No|Yes|Yes| |Spill control and
neutralization|1207.6.2|Yesc|Yesc|Yesf|No|Yes|No|Yes|Yes| |Thermal
runaway|1207.6.5|Yesd|Yes|Yese|Yese|No|Yes|Yese|Yes| |a. Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less
than 50 VAC and 60 VDC.
b. Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.2.2 that provides justification why the
protection is not necessary based on the technology used.
c. Applicable to vented-type (i.e., flooded) nickel-cadmium and lead-acid batteries.
d. Not required for vented-type (i.e., flooded) batteries.
e. The thermal runaway protection is permitted to be part of a battery management system that has been evaluated with the battery as part of the evaluation to UL 1973.
f. Not required for batteries with jelled electrolyte.|a. Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less
than 50 VAC and 60 VDC.
b. Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.2.2 that provides justification why the
protection is not necessary based on the technology used.
c. Applicable to vented-type (i.e., flooded) nickel-cadmium and lead-acid batteries.
d. Not required for vented-type (i.e., flooded) batteries.
e. The thermal runaway protection is permitted to be part of a battery management system that has been evaluated with the battery as part of the evaluation to UL 1973.
f. Not required for batteries with jelled electrolyte.|a. Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less
than 50 VAC and 60 VDC.
b. Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.2.2 that provides justification why the
protection is not necessary based on the technology used.
c. Applicable to vented-type (i.e., flooded) nickel-cadmium and lead-acid batteries.
d. Not required for vented-type (i.e., flooded) batteries.
e. The thermal runaway protection is permitted to be part of a battery management system that has been evaluated with the battery as part of the evaluation to UL 1973.
f. Not required for batteries with jelled electrolyte.|a. Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less
than 50 VAC and 60 VDC.
b. Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.2.2 that provides justification why the
protection is not necessary based on the technology used.
c. Applicable to vented-type (i.e., flooded) nickel-cadmium and lead-acid batteries.
d. Not required for vented-type (i.e., flooded) batteries.
e.CRC § 503.7.1 High relevance — show source text
** Heat pumps equipped with internal electric resistance heaters shall have controls that prevent supplemental heater operation where the heating load is capable of being met by the heat pump alone during both steady-state operation and setback recovery. Supplemental heater operation shall be permitted during outdoor coil defrost cycles. Exception: Heat pumps whose minimum efficiency is regulated by U.S. National Appliance Energy Conservation Act (NAECA) and whose ratings are in accordance with the requirements shown in Table E 503.7.1(2) and includes the use of an internal electric resistance heating. [ASHRAE 90.1:6.4.3.5] E 503.4.6.7 Humidification and Dehumidifica- tion Control. Humidification and dehumidification
control shall be in accordance with Section E 503.4.6.7.1 through Section E 503.4.6.7.3. E 503.4.6.7.1 Dehumidification. Humidistatic controls shall not use mechanical cooling to reduce the humidity below the lower of a dew point of 55°F (12.8°C) or relative humidity of 60 percent in the coldest zone served by the system. Exceptions: (1) Lower humidity shall be permitted when operating mechanical cooling for temperature control.
(2) Systems serving zones where specific humidity levels are required, such as museums and hospitals, and approved by the Authority Having Jurisdiction or required by accreditation standards, and where humidistatic controls are capable of and configured to maintain a dead band of at least 10 percent relative humidity where no active humidification or dehumidification takes place.
(3) Systems serving zones where humidity levels are required to be maintained with precision of not more than ±5 percent relative humidity to comply with applicable codes or accreditation standards or as approved by the Authority Having Jurisdiction.
[ASHRAE 90.1:6.4.3.6.1]
E 503.4.6.7.2 Humidification. Humidistatic controls shall not use fossil fuel or electricity to produce relative humidity above 30 percent in the warmest zone served by the system.
Exceptions:
(1) Systems serving zones where specific humidity levels are required, such as museums and hospitals, and approved by the Authority Having Jurisdiction or required by accreditation standards, and where humidistatic controls are capable of and configured to maintain a dead band of at least 10 percent relative humidity where no active humidification or dehumidification takes place.
TABLE E 503.4.6.4.2 MAXIMUM DAMPER LEAKAGE [1, 2]
(cubic foot per minute per square foot) at 1.0 inch water gauge
[ASHRAE 90.1: TABLE 6.4.3.4.3]
CRC § 18008.7. High relevance — show source text
MANUFACTURED HOME. A structure designed to be used as a single-family dwelling, as defined in the Health and Safety Code, Section 18007.
MEMBRANE STRUCTURE. An air-inflated, air-supported, cable or frame-covered structure, not otherwise defined as a tent. (See Chapter 31 of the California Building Code.)
MOBILEHOME. A structure designed to be used as a single-family dwelling, as defined in the Health and Safety Code, Section 18008.
MULTIFAMILY MANUFACTURED HOME. A structure designed to contain not less than two dwelling units, as defined in the Health and Safety Code, Section 18008.7.
PARK TRAILER. A trailer designed for human habitation that meets all requirements in the Health and Safety Code, Section 18009.3.
RECREATIONAL VEHICLE. A motor home, travel trailer, truck camper or camping trailer, with or without motive power, designed for human habitation, that meets all requirements in the Health and Safety Code, Section 18010.
STATE OF EMERGENCY. State of Emergency as defined in the Government Code, Section 8558.
TENT. A structure, enclosure or shelter, with or without sidewalls or drops, constructed of fabric or pliable material supported by any manner except by air or the contents that it protects.
SECTION CJ103—EMERGENCY HOUSING
CJ103.1 General. Emergency sleeping cabins, emergency transportable housing units, membrane structures and tents constructed and/or assembled in accordance with this appendix, shall be occupied only during declaration of state of emergency, local emergency or shelter crisis.
2025 CALIFORNIA RESIDENTIAL CODE APPENDIX CJ-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX CJ — EMERGENCY HOUSING
Buildings and structures constructed in accordance with the California Building Standards Code, used as emergency housing, shall be permitted to be permanently occupied.
CJ103.2 Existing buildings. Existing residential and nonresidential buildings or structures shall be permitted to be used as emergency housing and emergency housing facilities provided such buildings or structures comply with the building code provisions and/or other regulations in effect at the time of original construction and/or alteration. Existing buildings or structures used as emergency housing shall not become or continue to be substandard buildings, as determined by the enforcing agency.
CJ103.2.1 New additions, alterations and change of occupancy. New additions, alterations and change of occupancy to existing buildings shall comply with the requirements of the California Building Standards Code effective at the time of addition, alteration or change of occupancy. The requirements shall apply only to and/or within the specific area of the addition, alteration or change of
occupancy.
Exception: Existing buildings and structures used for emergency housing and emergency housing facilities may not be required to comply with the California Energy Code, as determined by the enforcing agency.
CRC § 5.10.1. High relevance — show source text
For additional information on disconnect switches and distributed generation requirements, see PG&E’s Distribution Interconnection Handbook .
B. Virtual Net Energy Metering − VNEM (NEMV)
This program allows qualified participants to install a single solar system to cover the electricity load of both common and tenant metered areas connected at the same service delivery point.
This Electric Rate Schedules table helps housing owners allocate a solar system’s electricity to tenants enabling residents to receive the direct benefits of the building’s solar system without requiring the generator to be physically connected to each billing meters.
Refer to Numbered Document 076249, “Virtual Net Energy Metering Installations,” found in Appendix C, which explains the requirements for VNEM installations and illustrates the various metering and connection options for VNEM projects. Check the PG&E Electric Rate Schedules website for the latest information on this program.
C. Requirements for Generators That Are Not Permanently Connected (i.e., Temporary Connections)
Portable electric generators must be connected as described in the California Health and Safety Code, Division 104, Part 15, Chapter 5, Section 119075(b). This code says that any portable electric generator that can be connected temporarily to an applicant’s electrical system, and that is supplied typically by an electrical corporation or state or local public agency, can be connected only after separating the applicant’s electrical system from that of the electrical corporation or state or local agency.
This rule applies to any generator connected as a temporary (i.e., nonroutine, nonscheduled) or emergency source of power.
Connect any portable electric generator that is used periodically as a source of power, either on an as-needed or scheduled basis, as described in Subsection 5.10.1.D., on Page 5-45. An example would be a generator used to provide backup power for equipment maintenance.
2022 – 2023 5-44
Generator
Section 5, Electric Metering: General
5.10.1. (continued)
D. Requirements for Generators That Are Connected Either Permanently or Periodically to an Electrical Service and Used on a Planned, Routine, or Scheduled Basis, but Do Not Operate in Parallel with the PG&E System.
Generators falling under this category must have a disconnect switch that is accessible to, and in a location approved by, the serving utility.
CRC § 408.12 High relevance — show source text
408.12 Emergency and standby power systems. Special electrical systems, exit illumination, power installations and alternate on-site electrical supplies shall be provided for every building or portion of a building housing 10 or more inmates in a detention or correctional facility in accordance with the provisions of the California Electrical Code. There shall be a source of emergency power in all detention facilities capable of providing minimal lighting in all housing units, activity areas, corridors, stairs and central control points, and to maintain fire and life safety, security, communications and alarm systems.
408.13 Windows. In security areas within cell complexes sprinklered throughout, the area of glazing in one-hour corridor walls and smoke barrier walls shall not be restricted, provided: 1. All openings are protected by fixed glazing listed and labeled for a fire-protection of at least [3] / 4 hour; or 2. Fixed security glazing set in noncombustible frames. Shall comply with the minimum requirements of one of the following test standards: ASTM F1915 Grade 3 glass or H.P. White Laboratory, Inc., HPW-TP- 0500.02, Forced Entry Level III. 2. In lieu of the sizes set forth in CBC, the size and area of glazed assemblies shall conform to the following: Windows required to have a three-fourths-hour fire-resistive rating or windows protected by fixed security glazing, as delineated in Items 1 and 2 above, may have an area not greater than 84 square feet (7.8 m [2] ) with neither width nor height exceeding 12 feet (3658 mm).
408.14 Safety padding. Padding material used on walls, floors and ceilings in Group I and R-2.1 occupancies shall be of an approved type tested in accordance with the procedures established by State Fire Marshal Standard 12-8-100, Room Fire Test for Wall and Ceiling Materials, California Code of Regulations, Title 24, Part 12.
408.15 Small management yards.
408.15.1 General. The provisions of Sections 408.15.1 through 408.15.5 shall apply to small management yards. Small management yards may be used by a maximum of two occupants at any one time for a maximum of 2 hours per day.
408.15.2 Construction. Small management yards shall be constructed in accordance with all of the following: 1. Constructed of Type IB noncombustible materials.
2. Fence material shall be noncombustible.
3. Have a maximum area of 150 square feet (14 m [2] ). 4. Yard area covering shall not exceed 75 square feet (7 m [2] ) or a maximum of 50 percent of the fenced enclosure. 5. Electrical lighting or devices of any type shall not be permitted within the yard. Exception: Low voltage devices dedicated for the operation of toilets.
408.15.3 Fire protection system provisions.
2025 CALIFORNIA BUILDING CODE 4-29
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY AND USE
Frequently asked questions
Must every emergency sleeping cabin have utility power?
No — § CJ104.6 requires a continuous source of electricity but explicitly allows the source to be an emergency generator or a renewable source (solar/wind) as an exception; regardless of source, installation must comply with the California Electrical Code.
If I provide non‑electrical heating, do I still need to install a dedicated outlet for heating?
No — § CJ104.6 states that the listed electrical heating equipment and dedicated receptacle are not required when a non‑electrical source of heating is provided.
Are recreational vehicles automatically covered by § CJ104.6?
Recreational vehicles used as emergency transportable housing are included in the definition of emergency transportable housing units, but § CJ105.1 requires those units to also comply with the Health & Safety Code and Title 25 regulations as applicable. Check those statutes and regulations in addition to Appendix CJ.
Is the requirement for a GFCI outlet flexible by occupant count?
No — § CJ104.6 requires at least one GFCI‑protected receptacle for use by the occupant(s). The text does not make that number conditional on occupant count.
If my jurisdiction has not adopted Appendix CJ, are these rules enforceable?
No — the appendix includes a prefatory note that its provisions are not mandatory unless specifically referenced in the adopting ordinance. Confirm local adoption before treating Appendix CJ as mandatory.
More in California Residential Code
Ask about the CRC
Get cited, plain-English answers on the California Residential Code for your project — any code section, any scenario.
Start Free Trial