CWUIC · California Wildland-Urban Interface Code

What clearances are required for outbuildings and accessory structures?

For homeowners in WUI areas: clear a 10‑foot radius around any outbuilding to bare mineral soil and manage plants from just beyond 10 feet to 20 feet as fire‑smart vegetation. This requirement is set out in **§ 604.4** of the CWUIC.

Last reviewed: July 6, 2026

What the code requires — plain English (controlling §)

The California Wildland‑Urban Interface Code requires that outbuildings be cleared to 10 feet (3048 mm) down to bare mineral soil in all directions. Vegetation between more than 10 feet and less than 20 feet (6096 mm) from an outbuilding must be fire‑smart vegetation (i.e., managed to reduce wildfire intensity). This rule is stated in § 604.4.

Clear brush and fuels so there is no combustible ground fuel within 10 feet of an outbuilding; any plants from 10–20 feet away must be maintained as fire‑smart vegetation.

Requirements in detail

The two clear zones

  • Zone 1 — 0 to 10 feet (3048 mm) from the outbuilding: cleared to bare mineral soil. § 604.4
  • Zone 2 — >10 feet to <20 feet (3049–6095 mm) from the outbuilding: vegetation allowed but must be fire‑smart (managed to reduce flammability). § 604.4

Quick reference table (decision‑relevant dimensions)

Item Required clearance / condition Code Reference
Cleared zone around outbuilding 10 feet (3048 mm) cleared to bare mineral soil in all directions § 604.4
Vegetation beyond immediate cleared zone Vegetation >10 ft and <20 ft (6096 mm) must be fire‑smart § 604.4

What “in all directions” means

  • The code language is radial: measure horizontally from the outbuilding’s exterior to determine the 10‑ and 20‑foot limits. § 604.4

Who is responsible / where it applies

  • These defensible‑space maintenance rules apply to buildings and structures located in the areas listed in Chapter 6 (e.g., SRAs, Very High Fire Hazard Severity Zones, or local WUI areas) and are part of the maintenance of defensible space obligations in Chapter 6. See § 604.1–604.3 for scope and applicability.

Exceptions & special cases

  • Construction‑related exemptions in other chapters (for example, small Group U accessory structures exempt from some construction rules) do not change the vegetation‑clearance requirement in § 604.4 unless a different exception is expressly stated in Chapter 6. See related exemptions for accessory structures in § 501.1 and construction rules in § 504.11 (these address materials and distance‑based construction requirements, not the defensible‑space clearance itself).
  • Disposal of removed flammable vegetation must follow the disposal rules in § 604.5 (local approval and applicable laws).

Common mistakes

  • Treating the 10‑foot rule as “10 feet of trimmed plants” instead of clearing to bare mineral soil. The code requires bare mineral soil in the immediate 10‑foot zone, not merely trimmed vegetation. § 604.4
  • Confusing construction material rules (when an accessory building must be noncombustible or ignition‑resistant) with these vegetation clearance rules; § 504.11 covers accessory building construction at certain separations, but the vegetation clearances are in § 604.4.
  • Measuring clearance from the property line or neighbor’s structure instead of from the outbuilding’s exterior wall — the measurement in § 604.4 is from the outbuilding itself.

Worked example

Scenario: You have a detached shed (an outbuilding) in a WUI area. The shed’s exterior wall is the starting point.

  • Step 1 — Immediately around the shed, clear a circle (or the actual plan shape) 10 feet (3048 mm) in every direction down to bare mineral soil (no combustible mulch, low shrubs, or leaf litter). This satisfies the immediate requirement in § 604.4.

  • Step 2 — From just beyond that 10‑foot line out to the 20‑foot (6096 mm) line, inspect and convert plantings to fire‑smart vegetation (e.g., irrigated, lower‑volume plants, widely spaced shrubs, removal of ladder fuels) per the code’s intent in § 604.4.

Numeric example: if your shed wall to the nearest shrub measures 8 feet, remove that shrub and any combustible ground cover within the 10‑ft radius (clear to bare soil). If a tree trunk is 12 feet from the shed, that tree’s surrounding fuels must be maintained as fire‑smart (but the trunk itself is not required to be removed solely by distance; the fuels under/around it must be managed). § 604.4

Related provisions (CWUIC sections)

  • § 604.4 — Outbuildings clearance requirement (controlling text)
  • § 604.1 — General maintenance objective for defensible space (context)
  • § 604.2 — Where the defensible‑space maintenance applies (SRAs, Very High FHSZ, local WUI areas)
  • § 604.3 — Reference to laws and regulations governing hazardous vegetation and fuels (responsibility)
  • § 604.5 — Disposal of flammable vegetation and fuels (post‑clearing requirements)
  • § 504.11 — Detailing accessory building construction requirements and separations (construction materials and distances) — related but distinct from vegetation clearances.
  • § 501.1 — Exceptions for small Group U accessory structures (where certain construction provisions differ).

Code references

Grounded in the retrieved California Wildland-Urban Interface Code — click a citation to read the verbatim passage:

  • CWUIC § 6-4 High relevance — show source text

    structure.

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    FIRE PROTECTION REQUIREMENTS

    SECTION 604—MAINTENANCE OF DEFENSIBLE SPACE

    604.1 General. Hazardous vegetation and fuels shall be managed to reduce the severity of potential exterior wildfire exposure to build- ings and to reduce the risk of fire spreading to buildings as required by applicable laws and regulations.

    Defensible space shall be managed around all buildings and structures in State Responsibility Areas (SRA) as required in Public Resources Code 4291.

    604.2 Application. Buildings and structures located in the following areas shall maintain the required hazardous vegetation and fuel management: 1. All unincorporated lands designated as a State Responsibility Area (SRA). 2. Land designated as a Very High Fire Hazard Severity Zone by a city or local agency. 3. Land designated in a city or local agency ordinance as a wildland-urban interface (WUI) area.

    604.3 Requirements. Hazardous vegetation and fuels around all buildings and structures shall be maintained in accordance with the following laws and regulations: 1. Public Resources Code, Section 4291.

    2. California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 3, Article 3, Section 1299.03. 3. California Government Code, Section 51182.

    4. California Code of Regulations, Title 19, Division 1, Chapter 7, Subchapter 1, Section 3.07.

    604.4 Outbuildings. Outbuildings shall have a minimum clearance of 10 feet (3048 mm) down to bare mineral soil in all directions. Vege- tation more than 10 feet (3048 mm) but less than 20 feet (6096 mm) from outbuildings shall be fire-smart vegetation.

    604.5 Disposal of flammable vegetation and fuels. The disposal, including burning or removal to a site approved by the local jurisdic- tion in consultation with the fire authority, of flammable vegetation and fuels caused by site, road and driveway construction shall be in accordance with all applicable laws and regulations. [CCR T14 §1276.05]

    SECTION 605—SPARK ARRESTORS

    605.1 General. Chimneys serving fireplaces, barbecues, incinerators or decorative heating appliances in which solid or liquid fuel is used shall be provided with a spark arrestor. Spark arrestors shall be constructed of woven or welded wire screening of 12 USA standard gage wire (0.1046 inch) (2.66 mm) having openings not exceeding [1] / 2 inch (12.7 mm).

    605.2 Net free area. 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.

    SECTION 606—LIQUEFIED PETROLEUM GAS INSTALLATIONS

    606.1 General. The storage of liquefied petroleum gas (LP-gas) and the installation and maintenance of pertinent equipment shall be in accordance with the California Fire Code .

    606.2 Location of containers or tanks. LP-gas containers or tanks shall be located within the defensible space in accordance with the California Fire Code .

  • CWUIC § 504.11.3 High relevance — show source text

    504.11.3 Accessory buildings greater than 120 square feet, located 3 feet or more but less than 50 feet. Accessory buildings that are greater than 120 square feet (11.15 m2) in size and separated from an applicable building on the same lot by a distance of 3 feet (914 mm) or more but less than 50 feet (15 240 mm) shall be constructed of noncombustible materials or of ignition-resistant building materials as described in Section 503.2.4.

    504.11.4 Accessory buildings 120 square feet or less, located 3 feet or more but less than 50 feet. Where required by the code offi- cial, accessory buildings 120 square feet (11.15 m2) or less and separated from an applicable building on the same lot by a distance of 3 feet (914 mm) or more but less than 50 feet (15 240 mm) shall be constructed of noncombustible materials or of ignition-resistant building materials as described in Section 503.2.4.

    504.11.5 Miscellaneous structures located 3 feet or more but less than 50 feet. Where required by the code official, miscellaneous structures that require a permit and are separated from an applicable building on the same lot by a distance of 3 feet (914 mm) or more but less than 50 feet (15 240 mm) shall be constructed of noncombustible materials or of ignition-resistant building materials as described in Section 503.2.4.

    504.11.6 Roof construction. Roof assemblies and roof coverings of accessory buildings required to be constructed entirely of noncombustible materials or of ignition-resistant building materials shall comply with Sections 504.2 and 504.2.1. Roofs shall have a roofing assembly installed in accordance with its listing and the manufacturer’s installation instructions. Roof assemblies in Fire Hazard Severity Zones shall comply with a Class A fire classification when tested in accordance with ASTM E108 or UL 790.

    SECTION 505— RESERVED

    SECTION 506— RESERVED

    SECTION 507—REPLACEMENT OR REPAIR OF ROOF COVERINGS

    507.1 General. The roof covering on buildings or structures in existence prior to the adoption of this code that are replaced or have 50 percent or more replaced in a 12-month period shall be replaced with a roof covering required for new construction in accordance with Sections 504.2 and 504.2.1. All portions of a roof covering applied during an addition, alteration or repair to an existing structure shall meet at least a Class A fire classification.

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    CALIFORNIA WILDLAND-URBAN INTERFACE CODE – MATRIX ADOPTION TABLE

    CHAPTER 6 – FIRE PROTECTION REQUIREMENTS

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

  • CWUIC § 101.3.1 High relevance — show source text

    This code shall supplement the jurisdiction’s building and fire codes, if such codes have been adopted, to provide for special regulations to mitigate the fire- and life-safety hazards of the wildland-urban interface areas.

    101.3.1 Application. New buildings located in any Fire Hazard Severity Zone or Wildland-Urban Interface (WUI) Fire Area designated by the enforcing agency constructed after the application date shall comply with the provisions of this code. This shall include all new buildings with residential, commercial, educational, institutional or similar occupancy type use, which shall be referred to in this code as “applicable buildings,” as well as new buildings and structures accessory to those applicable buildings.

    Exceptions: 1. Group U occupancy accessory buildings of any size located at least 50 feet (15 240 mm) from an applicable building on the same lot.

    2. Group U occupancy agricultural buildings, as defined in Section 202 of the California Building Code of any size located at least 50 feet (15 240 mm) 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 504.11 shall comply only with the requirements of that section.

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

    101.3.1.1 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 Wildland-Urban Interface Area shall comply with this code, including all of the following areas:

    All unincorporated lands designated by the State Board of Forestry and Fire Protection as State Responsibility Area (SRA) including:

    Moderate Fire Hazard Severity Zones.

    High Fire Hazard Severity Zones.

    Very High Fire Hazard Severity Zones.

    Land designated as a Very High Fire Hazard Severity Zone by cities and other local agencies.

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    ADMINISTRATION

    Land designated as a wildland-urban interface area by cities and other local agencies.

    Exceptions: 1. New buildings located in any Fire Hazard Severity Zone within a State Responsibility Area, for which an application for a building permit is submitted on or after January 1, 2008, shall comply with this code. 2. New buildings located in any Fire Hazard Severity Zone within a State Responsibility Area or any wildland-urban interface area designated by cities and other local agencies for which an application for a building permit is submit- ted on or after December 1, 2005, but prior to July 1, 2008, shall only comply with the following sections of this chapter: 2.1. Section 507 – Replacement or Repair of Roof Coverings.

    2.2. Section 504.10 – Vents.

    [A] 101.4 Retroactivity. The provisions of the code shall apply to conditions arising after the adoption thereof, conditions not legally in existence at the adoption of this code and conditions that, in the opinion of the code official, constitute a distinct hazard to life or property.

    Exception: Provisions of this code that specifically apply to existing conditions are retroactive.

  • CWUIC § 5-1 High relevance — show source text

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    5 SPECIAL BUILDING CONSTRUCTION REGULATIONS

    User notes:

    About this chapter: Chapter 5 provides regulations that establish minimum standards for the location, design and construction of buildings and structures based on construction within a Fire Hazard Severity Zone or a Wildland-Urban Interface (WUI) Area.

    The construction provisions of Chapter 5 are intended to supplement the requirements of the California Building Code and California Residential Code and address mitigation of the unique hazards posed to buildings by wildfire and to reduce the hazards of building fires spreading to wildland fuels. This is accomplished by requiring ignition-resistant construction materials. Construction features regulated include underfloor areas; roof coverings; eaves and soffits; gutters and downspouts; exterior walls, doors and windows; ventilation openings and accessory structures.

    SECTION 501—GENERAL

    501.1 Scope. Buildings and structures in a wildland-urban interface area shall be constructed in accordance with the California Build- ing Code and this code.

    Exceptions:

    1. Group U accessory structures not exceeding 120 square feet (11 m [2] ) in floor area where located not less than 50 feet (15 240 mm) from applicable buildings.
    2. Group U agricultural buildings not less than 50 feet (15 240 mm) from applicable buildings.

    501.2 Objective. The objective of this chapter is to establish minimum standards to locate, design and construct buildings and structures or portions thereof for the protection of life and property, to resist damage from wildfires, and to mitigate building and structure fires from spreading to wildland fuels.

    501.3 Fire-resistance-rated construction. Where this code requires 1-hour fire-resistance-rated construction, the fire-resistance rating of building elements, components or assemblies shall be determined in accordance with the test procedures set forth in ASTM E119 or UL 263.

    Exceptions:

    1. The fire-resistance rating of building elements, components or assemblies based on the prescriptive designs prescribed in Section 721 of the California Building Code .
    2. The fire-resistance rating of building elements, components or assemblies based on the calculation procedures in accordance with Section 722 of the California Building Code .

    501.4 Noncombustibility tests. The tests indicated in Section 501.4.1 shall serve as criteria for acceptance of noncombustible building materials. The term “noncombustible” does not apply to the flame spread characteristics of interior finish or trim materials. A material shall not be classified as a noncombustible building construction material if it is subject to an increase in combustibility or flame spread beyond the limitations herein established through the effects of age, moisture or other atmospheric conditions.

    501.4.1 Noncombustible materials. Materials required to be noncombustible shall be tested in accordance with ASTM E136 and pass the test. Alternately, materials required to be noncombustible shall be tested in accordance with ASTM E2652 using the accep- tance criteria prescribed by ASTM E136.

  • CWUIC § 307.2 High relevance — show source text

    Exception: Handrails shall be permitted to protrude 4 [1] / 2 inches ( 114 mm) maximum.

    FIGURE 11B- 307.2—LIMITS OF PROTRUDING OBJECTS

    11B- 307.3 Post-mounted objects. Free-standing objects mounted on posts or pylons shall overhang circulation paths 12 inches (305 mm) maximum when located 27 inches ( 686 mm) minimum and 80 inches ( 2032 mm) maximum above the finish floor or ground. Where a sign or other obstruction is mounted between posts or pylons and the clear distance between the posts or pylons is greater than 12 inches (305 mm), the lowest edge of such sign or obstruction shall be 27 inches ( 686 mm) maximum or 80 inches ( 2032 mm) minimum above the finish floor or ground.

    Exception: The sloping portions of handrails serving stairs and ramps shall not be required to comply with Section 11B- 307.3.

    FIGURE 11B- 307.3—POST-MOUNTED PROTRUDING OBJECTS

    11B-307.3.1 Edges and corners. Where signs or other objects are mounted on posts or pylons, and their bottom edges are less than 80 inches (2032 mm) above the floor or ground surface, the edges of such signs and objects shall be rounded or eased and the corners shall have a minimum radius of [1] / 8 inch (3.2 mm).

    11B- 307.4 Vertical clearance. Vertical clearance shall be 80 inches ( 2032 mm) high minimum. Guardrails or other barriers shall be provided where the vertical clearance is less than 80 inches ( 2032 mm) high. The leading edge of such guardrail or barrier shall be located 27 inches ( 686 mm) maximum above the finish floor or ground.

    Exception: Door closers and door stops shall be permitted to be 78 inches ( 1981 mm) minimum above the finish floor or ground.

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    ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMMODATIONS, COMMERCIAL BUILDINGS AND PUBLIC HOUSING

    FIGURE 11B- 307.4—VERTICAL CLEARANCE

    11B-307.4.1 Guy braces. Where a guy support is used within either the width of a circulation path or 24 inches (610 mm) maximum outside of a circulation path, a vertical guy brace, sidewalk guy or similar device shall be used to prevent a hazard or an overhead obstruction.

    FIGURE 11B- 307.4.1—GUY BRACES

    11B- 307.5 Required clear width. Protruding objects shall not reduce the clear width required for accessible routes.

    SECTION 11B- 308 REACH RANGES

    11B- 308.1 General. Reach ranges shall comply with Section 11B- 308 .

  • CWUIC § 2.1 High relevance — show source text

    Application – Permanent buildings, and permanent accessory buildings or structures, constructed within mobilehome parks and special occupancy parks that are under the control and ownership of the park operator. Sections of this code which pertain to applications listed in this section are iden- tified using the abbreviation “HCD 2.”

    Enforcing Agency – The Department of Housing and Community Development, local building depart- ment or other local agency that has assumed respon- sibility for the enforcement of Health and Safety Code, Division 13, Part 2.1, commencing with Section 18200 for mobilehome parks and Health and Safety Code, Division 13, Part 2.3, commencing with Section 18860 for special occupancy parks.

    Authority Cited – Health and Safety Code Sections 17040, 17920.9, 17921, 17921.5, 17921.6, 17921.10, 17922, 17922.6, 17922.12, 17922.14, 17922.15, 17926, 17927, 17928, 17958.12, 18552, 18554, 18620, 18630, 18640, 18670, 18690, 18691, 18865, 18871.3, 18871.4, 18873, 18873.1 through 18873.5, 18938.3, 18944.11, and 19990; and Government Code Section 12955.1.

    References – Health and Safety Code Sections 17000 through 17062.5, 17910 through 17995.5, 18200 through 18700, 18860 through 18874, 18938.6, 18941, 19890, 19891, 19892 and 19960 through 19997; Civil Code Sections 1101.4, 1101.5 and 1954.201; and Government Code Sections 12955.1 and 12955.1.1. California Code of Regula- tions, Title 20, Sections 1605.1, 1605.3 and 1607; and Title 25, Sections 1042 and 2042.

    1.8.3 Local Enforcing Agency.

    1.8.3.1 Duties and Powers. The building department of every city, county, or city and county shall enforce all the provisions of law, this code, and the other rules and regu- lations promulgated by the Department of Housing and Community Development pertaining to the installation, erection, construction, reconstruction, movement, enlargement, conversion, alteration, repair, removal, demolition, or arrangement of apartments, condo- miniums, hotels, motels, lodging houses, and dwellings, including accessory buildings, facilities, and uses thereto.

    The provisions regulating the erection and construc- tion of dwellings and appurtenant structures shall not apply to existing structures as to which construction is commenced or approved prior to the effective date of these regulations. Requirements relating to use, mainte- nance, and occupancy shall apply to all dwellings and appurtenant structures approved for construction or constructed before or after the effective date of this code.

  • CWUIC § 403.2 High relevance — show source text

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    Access Applicability 402 Driveways 403.2 Fire apparatus access roads 403.3 Grade 403.7

    Individual structures 402.2 Marking of roads 402.3, 403.4 Restricted 403.1

    Subdivisions 402.1 Accessory Buildings and Miscellaneous Structures

    Defined 202

    Detached 504.11 Exempt from permit 105.3 Additions or Alterations 101.5

    Address Markers 402.3 Agriculture 202 Alternative Materials or Methods 104.2.2

    Appeals 112 Appendices 101.2.1 Applicable Building 202 Applicability 102 Approved 202 Approved Agency 104.2.2.6.1, 202 Authority of Code Official 104

    Building 202 Building Official 202

    Certificate of Completion 111 Certificate of occupancy 111.2 Revocation 111.4

    Temporary occupancy 111.3

    Code Official 202 Code Official, Authority 104 Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Appendix C Compliance Alternatives 105 Construction Documents 106

    Amended 106.10

    Examination of 106.9 Information on plans and specifications 106.2 Phased 106.12

    Previous approval 106.11 Retention of 106.8 Site plan 106.3 Vegetation management plans 106.4 Control of Storage Appendix A, A105 Critical Fire Weather 202

    Dead-end Road 202 Defensible Space 403, 601.3 Vegetation Plan 603 Definitions 202 Designation of Wildland-Urban Interface Area 302.1

    Director 202 Driveway 202 Dumping Appendix A, A106 Dwelling 202

    Exterior Covering 202

    INDEX

    Fees 109 Findings of Fact Appendix E Fire Chief 202 Fire Danger Rating System Appendix D Fire Flow Calculation Area Application 404.5 Defined 202 Fire Hazard Severity Zones 1.1.2, 202, 302.1, 302.2, Appendix D, Appendix H Fire Protection Plans 602

    Fire Weather 202

    Fire-Resistance-Rated Construction 501.3 Fire-Resistive Vegetation Appendix F Fire-Retardant-Treated Lumber or

    Wood 503.2, 504.5, 504.7, 504.11 Flame Spread Index 202 Flashing 504.2.1, 504.5.1 Fuel Break 202, 609 Fuel Models Appendix D Fuel Modification 202

    Fuel Modification Distance 603.2

    Fuel Mosaic 202 Fuel-Loading 202

    General Requirements Appendix A Green Belt 202

    Greenways 202

  • CWUIC § 1.8.4.1 High relevance — show source text

    **_ 1.8.4.1 Permits. A written construction permit shall be obtained from the enforcing agency prior to the erection, construction, reconstruction, installation, relocation, or alteration of any mechanical system. Exceptions: (1) Work exempt from permits as specified in Chapter 1, Scope and Administration, Division II, Section 104.2 Items (1) through (5) of this code. (2) Changes, alterations, or repairs of a minor nature not affecting structural features, egress, sanitation, safety, or accessibility as determined by the enforcing agency.

    (3) Retroactive permits issued in accordance with Health and Safety Code Section 17958.12.

    Exemptions from permit requirements shall not be deemed to grant authorization for any work to be done in any manner in violation of other provisions of law or this code. 1.8.4.2 Fees. Subject to other provisions of law, the governing body of any city, county, or city and county may prescribe fees to defray the cost of enforcement of rules and regulations promulgated by the Department of Housing and Community Development. The amount of the fees shall not exceed the amount reasonably neces- sary to administer or process permits, certificates, forms, or other documents, or to defray the costs of enforcement. For additional information, see State Housing Law, Health and Safety Code, Division 13, Part 1.5, Section 17951 and California Code of Regulations, Title 25, Divi- sion 1, Chapter 1, Subchapter 1, Article 3, commencing with Section 6.

    1.8.4.3 Plan Review and Time Limitations. Subject to other provisions of law, provisions related to plan checking, prohibition of excessive delays, and contracting with or employment of private parties to perform plan checking are set forth in the State Housing Law, Health and Safety Code Section 17960.1, and for employee housing, in Health and Safety Code Section 17021. 1.8.4.3.1 Retention of Plans. The building depart- ment of every city, county, or city and county shall maintain an official copy, microfilm, or electronic or other type of photographic copy of the plans of every building, during the life of the building, for which the department issued a building permit. Exceptions: (1) Single or multiple dwellings not more than two stories and basement in height. (2) Garages and other structures appurtenant to buildings listed in Exception 1. (3) Farm or ranch buildings appurtenant to build- ings listed in Exception 1. (4) Any one-story building where the span between bearing walls does not exceed 25 feet (7620 mm), except a steel frame or concrete building. All plans for common interest developments as defined in Section 4100 of the California Civil Code shall be retained. For additional information regarding plan retention and reproduction of plans by an enforcing agency, see Health and Safety Code Sections 19850 through 19852. 1.8.4.4 Inspections. Construction or work for which a permit is required shall be subject to inspection by the building official and such construction or work shall remain accessible and exposed for inspection purposes _until approved.

  • CWUIC § 0.049 High relevance — show source text

    18 B.W. gage) steel tie wires. Lath applied over1/2"
    spacers made of3/ 4" furring channel with 2" legs bent around
    each corner. Spacers located 1" from top and bottom of
    member and not greater than 40" on center and wire tied
    with a single strand of 0.049" (No. 18 B.W. gage) steel tie
    wires. Corner bead tied to the lath at 6" on center along each
    corner to provide plaster thickness.|—|—|15/8|—| |1. Steel columns
    and all of
    primary
    trusses—
    continued|1-9.1|Minimum W8x35 wide flange steel column (w/d ≥ 0.75) with
    each web cavity filled even with the flange tip with normal
    weight carbonate or siliceous aggregate concrete (3,000 psi
    minimum compressive strength with 145 pcf ± 3 pcf unit
    weight). Reinforce the concrete in each web cavity with a
    minimum No. 4 deformed reinforcing bar installed vertically
    and centered in the cavity, and secured to the column web
    with a minimum No. 2 horizontal deformed reinforcing bar
    welded to the web every 18" on center vertically. As an alter-
    native to the No. 4 rebar,3/4" diameter by 3" long headed
    studs, spaced at 12" on center vertically, shall be welded on
    each side of the web mid-way between the column flanges.|—|—|—|See
    Note n| |2. Webs or
    flanges of steel
    beams and
    girders|2-1.1|Carbonate, lightweight and sand-lightweight aggregate
    concrete (not including sandstone, granite and siliceous
    gravel) with 3" or finer metal mesh placed 1" from the
    finished surface anchored to the top flange and providing not
    less than 0.025 square inch of steel area per foot in each
    direction.|2|11/2|1|1| |2. Webs or
    flanges of steel
    beams and
    girders|2-1.2|Siliceous aggregate concrete and concrete excluded in Item
    2-1.1 with 3" or finer metal mesh placed 1" from the finished
    surface anchored to the top flange and providing not less
    than 0.025 square inch of steel area per foot in each direction.|21/2|2|11/2|1| |2. Webs or
    flanges of steel
    beams and
    girders|2-2.1|Cement plaster on metal lath attached to3/4" cold-rolled
    channels with 0.04" (No. 18 B.W. gage) wire ties spaced 3" to
    6" on center. Plaster mixed 1: 21/2 by volume, cement to sand.|—|—|21/2
    b|7/8| |2. Webs or
    flanges of steel
    beams and
    girders|2-3.1|Vermiculite gypsum plaster on a metal lath cage, wire tied to
    0.165" diameter (No. 8 B.W. gage) steel wire hangers wrapped
    around beam and spaced 16" on center.

  • CWUIC § 601.3 High relevance — show source text

    Dead-end Road 202 Defensible Space 403, 601.3 Vegetation Plan 603 Definitions 202 Designation of Wildland-Urban Interface Area 302.1

    Director 202 Driveway 202 Dumping Appendix A, A106 Dwelling 202

    Exterior Covering 202

    INDEX

    Fees 109 Findings of Fact Appendix E Fire Chief 202 Fire Danger Rating System Appendix D Fire Flow Calculation Area Application 404.5 Defined 202 Fire Hazard Severity Zones 1.1.2, 202, 302.1, 302.2, Appendix D, Appendix H Fire Protection Plans 602

    Fire Weather 202

    Fire-Resistance-Rated Construction 501.3 Fire-Resistive Vegetation Appendix F Fire-Retardant-Treated Lumber or

    Wood 503.2, 504.5, 504.7, 504.11 Flame Spread Index 202 Flashing 504.2.1, 504.5.1 Fuel Break 202, 609 Fuel Models Appendix D Fuel Modification 202

    Fuel Modification Distance 603.2

    Fuel Mosaic 202 Fuel-Loading 202

    General Requirements Appendix A Green Belt 202

    Greenways 202

    Hammerhead/T 202 Hazardous Land Use 202

    Hazardous Materials 202 Heavy Timber Construction 202

    Ignition Source Control Appendix A, A104 Ignition-Resistant Building Material 202, 503 Ignition-Resistant Construction 504 Appendages 504.7 Detached accessory structures 504.11 Eaves 504.3

    Exterior doors 504.9

    Exterior walls 504.5

    Gutters and downspouts 504.4 Protection of eaves 504.3 Roof covering 504.2 Underfloor protection 504.6 Vents 504.10

    Windows 504.8 Ignition-Resistant Construction and Material 503 Inspection and Enforcement 109 Abatement 109.3.8 Authority to inspect 109.1.2 Citations 109.3.4

    Enforcement 109.2 Placarding 109.3.5.3 Prosecution 109.3.6

    Reinspections 109.1.3 Right of entry 104.4 Testing 109.1.4 Unsafe conditions 109.3.5

    Key Box 403.1

    Land Use Limitations Appendix A, A108 Legal Defense of the Code Official 104.8.1 Liability of the Code Official 104.8

    Log Wall Construction 202 LP-Gas Installations 606

    Maintenance 101.6 Maintenance of Defensible Space 604 Modified area 604.2 Responsibility 604.3 Trees 604.4 Mapping of Wildland-Urban Interface Area 302.2 Multilayered Glazed Panels 202

    Noncombustible Roof Covering 202

    Outbuilding 202

  • CWUIC § 8.1 High relevance — show source text

    8.1_ –504.8.2|||X||||||||||||||||||||| |504.9|||X||||||||||||||||||||| |504.9.1504.9.3|||X||||||||||||||||||||| |504.10.1 – 504.10.3|||X||||||||||||||||||||| |504.11 – 504.11.1|||X||||||||||||||||||||| |504.11.2504.11.6|||X||||||||||||||||||||| |505 – 506_Reserved_|||X||||||||||||||||||||| |507.1|||X|||||||||||||||||||||

    • The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Wildland-Urban Interface Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    The California Code of Regulations (CCR), Title 14, Division 1.5 provisions that are found in the California Wildland-Urban Interface Code are not listed in the Matrix Adoption Tables as they are not within the State Fire Marshal’s authority to adopt. These provisions are a reprint from the current CCR, Title 14, Division 1.5 text for the code user’s convenience only and are identified in the body of the code by square brackets containing references to applicable Title 14 sections.

    2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE 5-1

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

    5-2 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

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

    5 SPECIAL BUILDING CONSTRUCTION REGULATIONS

    User notes:

    About this chapter: Chapter 5 provides regulations that establish minimum standards for the location, design and construction of buildings and structures based on construction within a Fire Hazard Severity Zone or a Wildland-Urban Interface (WUI) Area.

    The construction provisions of Chapter 5 are intended to supplement the requirements of the California Building Code and California Residential Code and address mitigation of the unique hazards posed to buildings by wildfire and to reduce the hazards of building fires spreading to wildland fuels. This is accomplished by requiring ignition-resistant construction materials. Construction features regulated include underfloor areas; roof coverings; eaves and soffits; gutters and downspouts; exterior walls, doors and windows; ventilation openings and accessory structures.

    SECTION 501—GENERAL

    501.1 Scope. Buildings and structures in a wildland-urban interface area shall be constructed in accordance with the California Build- ing Code and this code.

    Exceptions:

    1. Group U accessory structures not exceeding 120 square feet (11 m [2] ) in floor area where located not less than 50 feet (15 240 mm) from applicable buildings.
    2. Group U agricultural buildings not less than 50 feet (15 240 mm) from applicable buildings.
  • CWUIC § 1132A.5 High relevance — show source text

    Note: See Section 1132A.5 for maneuvering clearances at primary entry doors and all required exit doors to covered multifamily dwellings.

    1126A.3.2.2 Hinge side approach. The following provisions shall apply to swinging doors or gates with hinge side approach: 1. Pull side approach. Doors or gates with pull side approach shall be provided with a level floor or landing not less than 60 inches (1524 mm) in depth. A clear and level area shall extend a minimum of 36 inches (914 mm) past the strike edge on the approach side of the door or gate. (See Figure 11A-8A(b).) 2. Push side approach. Doors or gates with push side approach shall have a level floor or landing not less than 44 inches (1118 mm) in depth, and shall be provided with a clear and level area extending a minimum of 54 inches (1372 mm) from the strike edge of the door or gate jamb past the hinge side of the door or gate. Doors or gates with a latch and closer shall have a level floor or landing not less than 48 inches (1219 mm) depth at the push side of the door or gate. (See Figure 11A-8A(b).)

    1126A.3.2.3 Latch side approach. The following provisions shall apply to swinging doors or gates with latch side approach: 1. Pull side approach. Doors or gates with pull side approach shall have a level floor or landing not less than 60 inches (1524 mm) in depth, and shall be provided with a clear and level area extending a minimum of 24 inches (610 mm) past the strike edge on the approach side of the door or gate. (See Figure 11A-8A(c).)

    2. Push side approach. Doors or gates with push side approach shall have a level floor or landing not less than 44 inches (1118 mm) in depth, and shall be provided with a clear and level area extending a minimum of 24 inches (610 mm) past the strike edge on the approach side of the door or gate. Doors or gates with a closer shall have a level floor or landing not less than 48 inches (1219 mm) depth at the push side of the door or gate. (See Figure 11A-8A(c).)

    1126A.3.3 Space between consecutive doors or gates. The minimum space between two hinged or pivoted doors or gates in series, serving other than a required exit stairway, shall provide a minimum of 48 inches (1219 mm) plus the width of the door or gate swing- ing into the space. Doors or gates in a series shall swing either in the same direction or away from the space between the doors or gates. (See Figures 11A-8G and 11A-8H.)

    Where the door or gate opens into a stair or smokeproof enclosure, the landing need not have a minimum length of 60 inches (1524 mm). (See Figure 11A-8H.)

    1126A.3.4 Doorways without doors or gates, sliding doors and folding doors. Doorways less than 36 inches (914 mm) wide without doors or gates, sliding doors or folding doors shall have maneuvering clearances complying with this section.

Frequently asked questions

Do these clearances apply to all accessory structures regardless of size?

Yes — § 604.4 speaks to outbuildings generally. Some construction exemptions for very small Group U accessory structures are found elsewhere (see § 501.1 and § 504.11), but the defensible‑space vegetation clearance in § 604.4 remains the cited vegetation‑management requirement.

What does “bare mineral soil” mean in practice?

“Bare mineral soil” means removing combustible ground fuels (mulch, leaf litter, dead vegetation) so the surface is mineral soil or noncombustible surfacing immediately adjacent to the outbuilding, as required in § 604.4.

If I plant low‑water landscaping, can it remain within 10 feet?

No — the code requires the 0–10 ft area to be cleared to bare mineral soil; vegetation (even low‑water plants) is allowed only beyond that 10‑ft limit and must be fire‑smart between 10 and 20 ft. § 604.4

Who enforces these clearances and disposal requirements?

Local code officials and fire authorities enforce Chapter 6 maintenance and defensible‑space provisions; disposal of removed fuels must follow § 604.5 and local regulations.

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