Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY AND USE
Section 420 — GROUPS R-1, R-2, R-2.1, R-2.2, R-3, R-3.1 AND R-4
2025 California Building Code (Title 24, Part 2) · 2025 edition · ingested 2026-07-07 · California
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420.1 General. ¶
420.1 General. Occupancies in Groups R-1, R-2, R-2.1, R-2.2, R-3, R-3.1 and R-4 shall comply with the provisions of Sections 420.1 through 420.11 and other applicable provisions of this code.
420.2 Separation walls. ¶
420.2 Separation walls. Walls separating dwelling units in the same building, walls separating sleeping units in the same building, walls separating dwelling units from sleeping units in the same building and walls separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as fire partitions in accordance with Section 708.
420.3 Horizontal separation. ¶
420.3 Horizontal separation. Floor assemblies separating dwelling units in the same buildings, floor assemblies separating sleeping units in the same building, floor assemblies separating dwelling units from sleeping units in the same building and floor assemblies separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as horizontal assemblies in accordance with Section 711. [F] 420.4 Automatic sprinkler system. Group R occupancies shall be equipped throughout with an automatic sprinkler system in accordance with Section…
420.6 Smoke barriers in Group R-2.1 . ¶
420.6 Smoke barriers in Group R-2.1 . Smoke barriers shall be provided in Group R-2.1 to subdivide every story used by persons receiving care, treatment or sleeping and to provide other stories with an occupant load of 50 or more persons, into not fewer than two smoke compartments. Such stories shall be divided into smoke compartments with an area of not more than 22,500 square feet (2092 m [2] ) and the distance of travel from any point in a smoke compartment to a smoke barrier door shall not exceed 200 feet (60 960 mm). The smoke barrier shall be in accordance with Section 709. 4-52 2025…
420.7 Reserved. ¶
420.8 Reserved. ¶
420.9 Domestic cooking appliances. ¶
420.9 Domestic cooking appliances. In Group R-2.1 occupancies, installation of cooking appliance used in domestic cooking facilities shall comply with all of the following: 1. The types of cooking appliances permitted shall be limited to ovens, cooktops, ranges, warmers and microwaves. 2. Domestic cooking hoods installed and constructed in accordance with the California Mechanical Code shall be provided over cooktops or ranges. 3. Cooktops and ranges shall be protected in accordance with Section 904.15. 4. A shutoff for the fuel and electrical supply to the cooking equipment shall be provided…
420.10 Group R cooking facilities. ¶
420.10 Group R cooking facilities. In Group R occupancies, cooking appliances used for domestic cooking operations shall be in accordance with the California Mechanical Code .
420.11 Group R-2 dormitory cooking facilities. ¶
420.11 Group R-2 dormitory cooking facilities. Domestic cooking appliances for use by residents of Group R-2 college dormitories shall be in accordance with Sections 420.11.1 and 420.11.2. 420.11.1 Cooking appliances. Where located in Group R-2 college dormitories, domestic cooking appliances for use by residents shall be in compliance with all of the following: 1. The types of domestic cooking appliances shall be limited to ovens, cooktops, ranges, warmers, coffee makers and microwaves. 2. Domestic cooking appliances shall be limited to approved locations. 3. Cooktops and ranges shall be…
420.12 [HCD 1] Construction waste management. ¶
420.12 [HCD 1] Construction waste management. Recycle and/or salvage for reuse a minimum of 65 percent of the nonhazardous construction and demolition waste in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.4.
420.13 Special provisions for residential hotels. [HCD 1 & HCD 1-AC] ¶
420.13 Special provisions for residential hotels. [HCD 1 & HCD 1-AC] 420.13.1 Locking mail receptacles. A locking mail receptacle for each residential unit shall be provided in all residential hotels pursuant to the requirements specified in Health and Safety Code Section 17958.3.
420.14 [HCD 1] Electric vehicle (EV) charging for new construction. ¶
420.14 [HCD 1] Electric vehicle (EV) charging for new construction. Newly constructed Group R-1, R-2 and R-3 buildings shall meet requirements for electric vehicle charging in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Divi- sion 4.1.
420.15 Licensed 24-hour care facilities in a Group R-2.1, R-3.1 or R-4 occupancy. ¶
420.15 Licensed 24-hour care facilities in a Group R-2.1, R-3.1 or R-4 occupancy. See Section 435 for Special Provisions for licensed 24-hour care facilities in a Group R-2.1, R-3.1 or R-4 occupancy.
420.16 Electronic monitoring. ¶
420.16 Electronic monitoring. In Group R-2.2 occupancies there shall be continuous electronic supervision via CCTV system camera coverage and monitoring the following areas: corridors, storage rooms over 100 square feet, central kitchen and main entryway of the facility. on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY AND USE