Skip to content

Appendix H — REFERENCED CALIFORNIA DOCUMENTS

Section H103 — CALIFORNIA PUBLIC RESOURCES CODE

2025 California Wildland-Urban Interface Code (Title 24, Part 7.5) · 2025 edition · updated 2026-07-27 · California

Sections 4201–4204; 4290–4291.

4201. The purpose of this article is to provide for the classification of lands within state responsibility areas in accordance with the severity of fire hazard present for the purpose of identifying measures to be taken to retard the rate of spreading and to reduce the potential intensity of uncontrolled fires that threaten to destroy resources, life, or property. 4202. The State Fire Marshal shall classify lands within state responsibility areas into fire hazard severity zones. Each zone shall embrace relatively homogeneous lands and shall be based on fuel loading, slope, fire weather, and other relevant factors pres- ent, including areas where winds have been identified by the department as a major cause of wildfire spread.

4203.

(a) The State Fire Marshal shall, by regulation, designate fire hazard severity zones and assign to each zone a rating reflecting the degree of severity of fire hazard that is expected to prevail in the zone. (b) No designation of a zone and assignment of a rating shall be adopted by the State Fire Marshal until the proposed regulation has been transmitted to the board of supervisors of the county in which the zone is located at least 45 days before the adoption of the proposed regulation and a public hearing has been held in that county during that 45-day period. 4204. The State Fire Marshal shall periodically review zones designated and rated pursuant to this article and, as necessary, shall revise zones or their ratings or repeal the designation of zones. Any revision of a zone or its rating or any repeal of a zone shall conform to the requirements of Section 4203. In addition, the revision or repeal of a zone may be petitioned pursuant to Sections 11340.6 and 11340.7 of the Government Code.

4290.

(a) The board shall adopt regulations implementing minimum fire safety standards related to defensible space that are applicable to state responsibility area lands under the authority of the department, and to lands classified and designated as very high fire hazard severity zones, as defined in subdivision (i) of Section 51177 of the Government Code. These regulations apply to the perimeters and access to all residential, commercial, and industrial building construction within state responsibility areas approved after January 1, 1991, and within lands classified and designated as very high fire hazard severity zones, as defined in subdivision (i) of Section 51177 of the Government Code after July 1, 2021. The board may not adopt building standards, as defined in Section 18909 of the Health and Safety Code, under the authority of this section. As an integral part of fire safety stan- dards, the State Fire Marshal has the authority to adopt regulations for roof coverings and openings into the attic areas of buildings specified in Section 13108.5 of the Health and Safety Code. The regulations apply to the placement of mobile homes as defined by National Fire Protection Association standards. These regulations do not apply where an application for a build- ing permit was filed prior to January 1, 1991, or to parcel or tentative maps or other developments approved prior to January 1, 1991, if the final map for the tentative map is approved within the time prescribed by the local ordinance. The regulations shall include all of the following: (1) Road standards for fire equipment access. (2) Standards for signs identifying streets, roads, and buildings. (3) Minimum private water supply reserves for emergency fire use. (4) Fuel breaks and greenbelts. (b) The board shall, on and after July 1, 2021, periodically update regulations for fuel breaks and greenbelts near communities to provide greater fire safety for the perimeters to all residential, commercial, and industrial building construction within state responsibility areas and lands classified and designated as very high fire hazard severity zones, as defined in subdivision (i) of Section 51177 of the Government Code, after July 1, 2021. These regulations shall include measures to preserve undeveloped

APPENDIX H-6 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

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

APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

ridgelines to reduce fire risk and improve fire protection. The board shall, by regulation, define “ridgeline” for purposes of this subdivision.

(c) These regulations do not supersede local regulations which equal or exceed minimum regulations adopted by the state. (d) The board may enter into contracts with technical experts to meet the requirements of this section.

4290.1.

(a) On or before July 1, 2022, the board shall develop criteria for and maintain a “Fire Risk Reduction Community” list of local agen- cies located in a state responsibility area or a very high fire hazard severity zone, identified pursuant to Section 51178 of the Government Code, that meet best practices for local fire planning. (b) The board shall consider all of the following when developing the criteria for the list required under subdivision (a): (1) Compliance with the board’s regulations, including minimum fire safety standards. (2) Participation in the National Fire Protection Association’s “Firewise USA” or the National Wildfire Coordinating Group’s “Fire Adapted Communities” programs. (3) Adoption of the board’s recommendations to improve the safety element pursuant to subdivision (b) of Section 65302.5 of the Government Code.

(4) Recently developed or updated community wildfire protection plans. (c) The board shall post the “Fire Risk Reduction Community” list on its internet website.

4290.5.

(a) On or before July 1, 2021, and every five years thereafter, the board, in consultation with the State Fire Marshal, shall survey local governments, including counties, cities, and fire districts, to identify existing subdivisions located in a state responsibility area or a very high fire hazard severity zone, identified pursuant to Section 51178 of the Government Code, without a secondary egress route that are at significant fire risk. (b) (1) The board, in consultation with the State Fire Marshal and the local government that identified the subdivision, shall develop recommendations to improve the subdivision’s fire safety. The recommendations may include, but are not limited to, the following: (A) Creating secondary access to the subdivision. (B) Improvements to the existing access road. (C) Other additional fire safety measures. (2) The board shall provide the final recommendations developed pursuant to this subdivision to the local government that identified the subdivision and to the residents of the subdivision.

(c) The board may enter into contracts with an independent group to conduct the survey required in subdivision (a). (d) For purposes of this section, “subdivision” means an existing residential development of more than 30 dwelling units. (e) The board shall maintain a list of the subdivisions identified in subdivision (a) and the status of the implementation of the recommendations provided pursuant to subdivision (b).

4291.

(a) A person who owns, leases, controls, operates, or maintains a building or structure in, upon, or adjoining a mountainous area, forest-covered lands, shrub-covered lands, grass-covered lands, or land that is covered with flammable material, shall at all times do all of the following: (1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary shall consider the flammability of the structure as affected by building material, building standards, location, and type of vegetation. Fuels shall be maintained and spaced in a condition so that a wildfire burning under average weather conditions would be unlikely to ignite the structure. This subparagraph does not apply to single specimens of trees or other vege- tation that are well-pruned and maintained so as to effectively manage fuels and not form a means of rapidly transmitting fire from other nearby vegetation to a structure or from a structure to other nearby vegetation or to interrupt the advance of embers toward a structure. The intensity of fuels management may vary within the 100-foot perimeter of the structure, with more intense fuel reductions being utilized between 5 and 30 feet around the struc- ture, and an ember-resistant zone being required within 5 feet of the structure, based on regulations promulgated by the board, in consultation with the department, to consider the elimination of materials in the ember-resistant zone that would likely be ignited by embers. Consistent with fuels management objectives, steps should be taken to mini- mize erosion, soil disturbance, and the spread of flammable nonnative grasses and weeds. For purposes of this subparagraph, “fuel” means any combustible material, including petroleum-based products, cultivated landscape plants, grasses, and weeds, and wildland vegetation. (B) A greater distance than that required under subparagraph (A) may be required by state law, local ordinance, rule, or regulation. Fuel modification beyond the property line may only be required by state law, local ordinance, rule, or regulation in order to maintain 100 feet of defensible space from a structure. Fuel modification on adjacent property shall only be conducted following written consent by the adjacent landowner. Any local ordinance related to fuel modification shall be in compliance with all applicable state laws, regulations, and policies. Any local ordinance may include provisions to allocate costs for any fuel modification beyond the property line.

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

APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

(C) An insurance company that insures an occupied dwelling or occupied structure may require a greater distance than that required under subparagraph (A) if a fire expert, designated by the director, provides findings that the fuel modi- fication is necessary to significantly reduce the risk of transmission of flame or heat sufficient to ignite the structure, and there is no other feasible mitigation measure possible to reduce the risk of ignition or spread of wildfire to the structure. The greater distance may not be beyond the property line unless allowed by state law, local ordinance, rule, or regulation. (2) Remove that portion of a tree that extends within 10 feet of the outlet of a chimney or stovepipe. (3) Maintain a tree, shrub, or other plant adjacent to or overhanging a building free of dead or dying wood. (4) Maintain the roof of a structure free of leaves, needles, or other vegetative materials. (5) Before constructing a new building or structure or rebuilding a building or structure damaged by a fire in an area subject to this section, the construction or rebuilding of which requires a building permit, the owner shall obtain a certification from the local building official that the dwelling or structure, as proposed to be built, complies with all applicable state and local building standards, including those described in subdivision (b) of Section 51189 of the Government Code, and shall provide a copy of the certification, upon request, to the insurer providing course of construction insurance coverage for the building or structure. Upon completion of the construction or rebuilding, the owner shall obtain from the local building official, a copy of the final inspection report that demonstrates that the dwelling or structure was constructed in compliance with all applicable state and local building standards, including those described in subdivision (b) of Section 51189 of the Government Code, and shall provide a copy of the report, upon request, to the property insurance carrier that insures the dwelling or structure. (b) A person is not required under this section to manage fuels on land if that person does not have the legal right to manage fuels, nor is a person required to enter upon or to alter property that is owned by any other person without the consent of the owner of the property. (c) (1) Except as provided in Section 18930 of the Health and Safety Code, the State Fire Marshal may adopt regulations exempt- ing a structure with an exterior constructed entirely of nonflammable materials, or, conditioned upon the contents and composition of the structure, the director may vary the requirements respecting the removing or clearing away of flam- mable vegetation or other combustible growth with respect to the area surrounding those structures. (2) An exemption or variance under paragraph (1) shall not apply unless and until the occupant of the structure, or if there is not an occupant, the owner of the structure, files with the State Fire Marshal, in a form as the State Fire Marshal shall prescribe, a written consent to the inspection of the interior and contents of the structure to ascertain whether this section and the regulations adopted under this section are complied with at all times. (d) The State Fire Marshal may authorize the removal of vegetation that is not consistent with the standards of this section. The State Fire Marshal may prescribe a procedure for the removal of that vegetation and make the expense a lien upon the build- ing, structure, or grounds, in the same manner that is applicable to a legislative body under Section 51186 of the Government Code.

es._ (d) The State Fire Marshal may authorize the removal of vegetation that is not consistent with the standards of this section. The State Fire Marshal may prescribe a procedure for the removal of that vegetation and make the expense a lien upon the build- ing, structure, or grounds, in the same manner that is applicable to a legislative body under Section 51186 of the Government Code.

(e) (1) The board, in consultation with the State Fire Marshal, shall develop, periodically update, and post on its internet website a guidance document on fuels management pursuant to this chapter. The guidance document shall include, but not be limited to, regionally appropriate vegetation management suggestions that preserve and restore native species that are fire resistant or drought tolerant, or both, minimize erosion, minimize water consumption, and permit trees near homes for shade, aesthetics, and habitat; and suggestions to minimize or eliminate the risk of flammability of nonvege- tative sources of combustion, such as woodpiles, propane tanks, decks, outdoor furniture, barbecue equipment, and outdoor fire pits. (2) On or before January 1, 2023, the board, in consultation with the State Fire Marshal, shall update the guidance document to include suggestions for creating an ember-resistant zone within five feet of a structure, based on regulations promul- gated by the board, in consultation with the department, to consider the elimination of materials in the ember-resistant zone that would likely be ignited by embers. (f) The State Fire Marshal shall do both of the following: (1) Recommend to the board the types of vegetation or fuel that are to be excluded from an ember-resistant zone based on the probability that vegetation and fuel will lead to ignition by ember of a structure as a part of the update to the guid- ance document pursuant to paragraph (2) of subdivision (e). (2) Make reasonable efforts to provide notice to affected residents describing the requirements added by the amendments to paragraph (1) of subdivision (a) made in Assembly Bill 3074 of the 2019–20 Regular Session before the imposition of penalties for violating those requirements. (g) (1) The requirement for an ember-resistant zone pursuant to paragraph (1) of subdivision (a) shall not take effect for new structures until the board updates the regulations, pursuant to paragraph (1) of subdivision (a), and the guidance docu- ment, pursuant to paragraph (2) of subdivision (e). (2) The requirement for an ember-resistant zone pursuant to paragraph (1) of subdivision (a) shall take effect for existing structures one year after the effective date for the new structures. (h) The department shall not change defensible space inspection practices and forms or enforcement to implement the require- ment for an ember-resistant zone until the State Fire Marshal makes a written finding, which the State Fire Marshal shall post on the department’s internet website, that the Legislature has appropriated sufficient resources to do so.

APPENDIX H-8 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

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

APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

(i) For purposes of this section, a structure for the purpose of an ember-resistant zone shall include any attached deck. This section does not limit the authority of the board or the department to require the removal of fuel or vegetation on top of or underneath a deck pursuant to this section. (j) As used in this section, “person” means a private individual, organization, partnership, limited liability company, or corporation.

4291.1.

(a) Notwithstanding Section 4021, a violation of Section 4291 is an infraction punishable by a fine of not less than one hundred dollars ($100), nor more than five hundred dollars ($500). If a person is convicted of a second violation of Section 4291 within five years, that person shall be punished by a fine of not less than two hundred fifty dollars ($250), nor more than five hundred dollars ($500). If a person is convicted of a third violation of Section 4291 within five years, that person is guilty of a misde- meanor and shall be punished by a fine of not less than five hundred dollars ($500). If a person is convicted of a third violation of Section 4291 within five years, the department may perform or contract for the performance of work necessary to comply with Section 4291 and may bill the person convicted for the costs incurred, in which case the person convicted, upon payment of those costs, shall not be required to pay the fine. If a person convicted of a violation of Section 4291 is granted probation, the court shall impose as a term or condition of probation, in addition to any other term or condition of probation, that the person pay at least the minimum fine prescribed in this section. (b) If a person convicted of a violation of Section 4291 produces in court verification prior to imposition of a fine by the court, that the condition resulting in the citation no longer exists, the court may reduce the fine imposed for the violation of Section 4291 to fifty dollars ($50).

4291.3.

(a) Subject to any other applicable law, a state or local fire official, at their discretion, may authorize an owner of property, or the owner’s agent, to construct a firebreak, or implement appropriate vegetation management techniques, to ensure that defensi- ble space is adequate for the protection of a hospital, adult residential care facility, school, aboveground storage tank, hazardous materials facility, or similar facility on the property. The firebreak may be for a radius of up to 300 feet from the facil- ity, or to the property line, whichever distance is shorter. (b) The director may authorize an owner of a property not listed in subdivision (a) to construct a firebreak, or implement appropri- ate vegetation management techniques, within a radius of up to 300 feet from a structure, or to the property line, whichever distance is shorter, if it is determined by the director as necessary to protect life, property, and natural resources from unrea- sonable risks associated with wildland fires.

4291.5.

(a) For purposes of this section, the following definitions apply: (1) “Home hardening” means the replacement or repair of structural features that are affixed to the property with features that are in compliance with Chapter 7A (commencing with Section 701A.1) of Title 24 of the California Code of Regulations. (2) “Qualified entities” means the following entities that have completed the program developed and received a certifica- tion, pursuant to Section 4291.6: (A) Counties, state conservancies, special districts, and other political subdivisions of the state. (B) Members of the California Conservation Corps, the Board of Commissioners under California Volunteers described in Section 8411 of the Government Code, local conservation corps, resource conservation districts, fire safe coun- cils, and Firewise USA organizations. (C) University of California fire advisors. (D) Registered Professional Foresters. (E) Other entities or individuals deemed appropriate by the director. (3) “Wildfire safety improvements” mean wildfire resilience and fire safety improvements, including measures for home hardening, the creation of defensible space, and other appropriate fuel reduction activities, to residential, commercial, industrial, agricultural, or other real property identified by the State Fire Marshal, in consultation with the director. (b) The director shall establish a statewide program to allow qualified entities to support and augment the department in its defensible space and home hardening assessment and education efforts. Qualified entities participating in the program shall be authorized by the director to conduct defensible space assessments to assess compliance with Section 4291 within the state responsibility area, educate property owners about wildfire safety improvements that may be undertaken to harden a struc- ture and make it more resistant to fire, and assess whether wildfire safety improvements have been completed in or on a

structure.

(c) (1) The director shall establish a common reporting platform that allows defensible space and home hardening assessment data, collected by the qualified entities, to be reported to the department and shall establish any necessary quality control measure to ensure that the assessment data is accurate and reliable.

(2) The department shall compile the data submitted pursuant to paragraph (1). (d) The director may use the defensible space and home hardening assessment data to do any of the following: (1) Direct inspection and enforcement resources away from landowners who meet or exceed the department’s standards and regulations for maintaining defensible space.

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

APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

(2) Direct inspection and enforcement resources toward landowners who do not meet the department’s standards and regulations for maintaining defensible space. (3) Direct educational resources toward landowners who own or maintain structures that can be hardened to make them more resistant to fire.

(4) Assist in estimating defensible space compliance in the state responsibility area. (e) The department may expand or amend existing programs for the implementation of this section. (f) This section does not grant any right of entry onto private land or regulatory or enforcement authority to participating quali- fied entities.

(g) Any local governmental entity that is qualified to conduct defensible space assessments pursuant to this section in very high and high fire hazard severity zones, as identified by the State Fire Marshal pursuant to Section 51178 of the Government Code or Article 9 (commencing with Section 4201) of this chapter or by a local agency pursuant to Section 51179 of the Government Code and reports that information to the department, shall report that information using the common reporting platform established pursuant to subdivision (c). (h) (1) On December 31, 2023, and annually thereafter, the department shall report to the Legislature all defensible space data collected pursuant paragraph (2) of subdivision (c). The report may include information on the proportion of unique parcels that were inspected, the degree of compliance with requirements set forth in Section 4291, any enforcement actions that may have been taken for noncompliant parcels, and the proportion of parcels that were found to be in compliance across jurisdictions. At minimum, the report shall include data with sufficient detail to facilitate comparisons of community compliance with the requirements of Section 4291 between local governmental entities qualified to conduct defensible space assessments pursuant to this section and local governmental entities that are not. (2) A report submitted pursuant to this subdivision shall be submitted in compliance with Section 9795 of the Government Code.

(i) This section shall remain in effect only until January 1, 2026, and as of that date is repealed.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Contents — 2025 California Wildland-Urban Interface Code (Title 24, Part 7.5)

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.