Skip to main content
This section is included in your selections.

Chapter 3 of the 2022 California Residential Code is adopted in its entirety subject to the modifications thereto which are set forth below.


R337.1.1 Scope. Section R337 and all subsections apply to building materials, systems and/or assemblies used in the exterior design and construction of new buildings and structures, additions, alterations, repairs and re-roofs located within a Wildland-Urban Interface (WUI) Fire Area as defined in Section R337.2.

R337.1.2 Purpose. The purpose of Section R337 is to establish minimum standards for the protection of life and property by increasing the ability of a building located in any Fire Hazard Severity Zone within State Responsibility Areas or any building or structure in the Wildland-Urban Interface (WUI) Fire Area to resist the intrusion of flame or burning embers projected by a vegetation fire and contributes to a systematic reduction in conflagration losses.

R337.1.3 Application. New buildings located in any Fire Hazard Severity Zone or new buildings and structures, additions, alterations, repairs and re-roofs located in any Wildland-Urban Interface (WUI) Fire Area designated by the enforcing agency constructed after the application date shall comply with the provisions of this section. This shall include all new buildings with residential, commercial, educational, institutional or similar occupancy type use, which shall be referred to in this section as “applicable building” (see definition in Section R337.2), as well as new buildings and structures accessory to those applicable buildings (see Exceptions 1 and 4).


1.    Group U occupancy accessory buildings or structures of any size located at least 50 feet (15 m) from an applicable building on the same lot..

2.    Group U occupancy agricultural building or structure, as defined in Section 202 of the California Building Code, of any size located at least 50 feet (15 m) from an applicable building.

3.    Group C occupancy special buildings conforming to the limitations specified in Section 450.4.1 of the California Building Code.

4.    New accessory buildings and miscellaneous structures specified in Section R337.10 shall comply only with the requirements of that section.

5.    Additions to and remodels of building originally constructed prior to July 1, 2008.

R337.1.3.1 Application date and where required. New buildings for which an application for a building permit is submitted on or after July 1, 2008 located in any Fire Hazard Severity Zone or buildings and structures, additions, alterations, repairs and re-roofs for which an application for a building permit is submitted on or after July 1, 2008 located in the Wildland Interface Fire Area shall comply with all sections of this chapter.


For the purposes of this Section R337, certain terms are defined below:

FIRE ZONE ONE shall encompass the entire City of Berkeley except for Fire Zones Two and Three.

FIRE ZONE TWO encompasses those areas designated as Combined Hillside District in the Official Zoning map of the City of Berkeley and those areas designated as Very High in the official Fire Hazard Severity Zones (FHSZ) map of The Department of Forestry and Fire Protection (CAL FIRE), as they may be amended from time to time. The following properties, not part of the Combined Hillside District, are included in Fire Zone Two under the Very High designation of the FHSZ map: the eastern section of the University of California, Berkeley main campus, block number 2042 (Alameda County Assessor’s parcel numbering (APN) system), to the east city line; all of the Clark-Kerr campus, block number 7690, to the east city line; all of block number 7680 in the City of Berkeley; portions of block number 1702 in the City of Berkeley. See Exhibit A for the specific parcels by APN and address.

FIRE ZONE 3 encompasses those areas designated as Environmental Safety--Residential Districts on the Official Zoning Map of the City of Berkeley, as it may be amended from time to time.

LOCAL RESPONSIBILITY AREA (LRA). Areas of the state in which the financial responsibility of preventing and suppressing fires is the primary responsibility of a city, county, city and county, or district. Fire Zones 2 and 3 are designated as Local Responsibility Area.

WILDLAND-URBAN INTERFACE (WUI) is a geographical area identified by the state as a "Fire Hazard Severity Zone" in accordance with the Public Resources Code Sections 4201 through 4204 and Government Code Sections 51175 through 51189, or other areas designated by the enforcing agency to be at a significant risk from wildfires. Fire Zones 2 and 3 are designated as Wildland-Urban Interface (WUI) Fire Area.


R337.5.1 General. Roofs shall comply with the requirements of Sections R337 and R902. Roofs shall have a roofing assembly installed in accordance with its listing and the manufacturer’s installation instructions. Roof assemblies in the Fire Hazard Severity Zones shall be Class A rating when tested in accordance with ASTM E108 or UL790. Wooden shakes and shingles are prohibited roof coverings regardless of the assembly rating of the roof system.

Exception: Replacement of less than 50% of the roof area within a 5 year period.

R337.5.5 Spark Arrestors. All chimneys of fireplaces, stoves, barbecues or heating appliances using solid fuel shall be provided with an approved spark arrestor whenever modification has been made to any of these appliances, or whenever a structure is re-roofed. The net free area of the spark arrestor shall be not less than four times the net free area of the outlet of the chimney. The spark arrestor shall have heat and corrosion resistance equivalent to twelve-gauge wire, nineteen gauge galvanized wire, or twenty-four-gauge stainless steel. Openings shall not permit the passage of spheres having a diameter larger than one-half inch and shall not block the passage of spheres having a diameter of less than three-eighths inch. The arrestor shall be securely attached to the chimney or stovepipe and shall be adequately supported. The use of bands, mollies, masonry anchors or mortar ties are recommended depending upon the individual need.


R337.7.3.2 Replacement of Exterior Wall Covering. Materials for replacement of existing exterior wall covering shall meet or exceed the standards set forth in this chapter.

Exception: Where less than 50% of any wall surface is being replaced or repaired, and the matching of the new plane to the existing plane on that wall is not possible.


R337.11.1 Underground utility connections. For new construction, provisions shall be made for the undergrounding of all utilities serving the property, including but not limited to electrical, telephone and cable television, by the installation of appropriately sized underground conduits extending from the street property.


R337.12.1 General. In addition to meeting the other requirements of this Chapter, buildings or structures hereinafter erected, constructed, moved, altered, added, or repaired within Fire Zone Three shall comply with the following requirements for buildings and structures.

R337.12.2 Fire Warning System. All residential units shall be equipped with a Fire Warning System as specified by the residential smoke detector requirements of the current edition of the California Building Code and with an audible exterior alarm. The exterior alarm must meet the requirements of NFPA 72 or equivalent and generate 45 decibels ten feet from the alarm, or more.

R337.12.3 Automatic fire sprinklers systems. Automatic fire sprinkler system requirements shall be as set forth in Berkeley Fire Code Section 903.2.24.

R337.12.4 Utilities. Utilities, pipes, furnaces, water heaters or other mechanical devices located in an exposed underfloor area of a building or structure shall be enclosed with material as required for exterior one hour fire resistive construction. Adequate covered access openings for servicing and ventilation of such facilities shall be provided as required by appropriate codes.

R337.12.5 Control of brush or vegetation. Brush and vegetation shall be controlled as required in the Berkeley Fire Code.

R337.12.6 Special Conditions. The following additional conditions must be met:

1.    Public access roads and fire trails. No person(s) shall use any public access road or fire trail for the storage of any construction material, stationary construction equipment, construction office, portable refuse container, or earth from any grading or excavating.

2.    Water Service. The water service to the site shall be installed with a 3/4" hose bib connection prior to beginning any wood framing. The person responsible for the construction shall have at the site a 75 ft 3/4" hose available.

Exhibit A

Parcels in Addition to the Combined Hillside District

The following additional parcels by Assessor’s Parcel Number and address are included in Fire Zone Two:

Parcel Number (APN)



3 Tanglewood Road


5 Tanglewood Road


7 Tanglewood Road


11 Tanglewood Road


19 Tanglewood Road


25 Tanglewood Road


29 Tanglewood Road


10 Tanglewood Road


18 Tanglewood Road


22 Tanglewood Road


28 Tanglewood Road


2701 Belrose Avenue


2715 Belrose Avenue


2721 Belrose Avenue


2729 Belrose Avenue


2737 Belrose Avenue


2801 Claremont Boulevard


2811 Claremont Boulevard


2815 Claremont Boulevard


2821 Claremont Boulevard


2816 Claremont Avenue


2820 Claremont Avenue


3005 Garber Street


3015 Garber Street


3020 Garber Street


3017 Avalon Avenue

(Ord. 7839-NS § 2, 2022)