CWUIC · California Wildland-Urban Interface Code

Definitions for access, roads, fuel modification and Title 14 cross-references

This page explains the CWUIC definitions you must use for access, roads and fuel modification (the definitions live in **§ 202**). It highlights the measurable thresholds you’ll check in design/review (lane widths, clearances, one‑way limits) and explains that “fuel modification” requires ongoing maintenance and that several CWUIC terms point to Title 14 sections you must consult.

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Last reviewed: July 6, 2026

What the code requires — 2-4 sentences

The heart of the CWUIC definitions is § 202: it collects the defined terms used throughout the code (including the terms that control access, road geometry, fuel modification and the Title 14 cross‑references). Use the defined terms in § 202 when applying Chapter 4 access rules and Appendix/Title 14 references; many CWUIC sections (for example Section 403 on access) expressly call back to the definitions and to Title 14 for detail.

The single most important point: when the CWUIC uses a defined term (for example Driveway, Dead‑end Road, Defensible Space, Fuel Modification), apply the exact meaning given in § 202 (and follow the Title 14 cross‑references the CWUIC flags).

Requirements in detail

Use this section as a concise, decision‑ready reference for the definitions and the common dimensions/thresholds that matter for access and fuel modification.

Key CWUIC definitions you must apply (first use bolded)

  • § 202 — the definitions chapter; it is the controlling repository for terms used elsewhere in the CWUIC.
  • Driveway — defined in § 202; used in Chapter 4 access rules (driveways are treated differently from roads for lane/clearance requirements).
  • Dead‑end Road — defined in § 202 and cross‑referenced to Title 14 definitions; used to determine required turnarounds/length limits.
  • Defensible Space — the parcel perimeter area where fuel modification/vehicle access/addressing and water reserves are managed; CWUIC points user to the Title 14 definition as adopted into CWUIC terms.
  • Fuel Modification — defined in § 202 as a method of reducing or altering nonfire‑smart vegetation to reduce fuel load; continuous maintenance is required to count as fuel modification per Appendix B.
  • Fuel Mosaic — defined in § 202 as a fuel modification approach that creates islands/irregular boundaries to reduce visual/ecological impact.
  • Fuel Break and Green Belt (Title 14) — the CWUIC includes Title 14 cross‑referenced definitions for fuel break and green belt; see the Title 14 citations included in the definitions table.

Decision table — access, road and fuel modification dimensions (use in plan review or design checks)

Decision dimension / threshold Typical value or definition you must check Code reference
Minimum two‑way road lanes Two 10‑foot traffic lanes (does not include shoulders/striping) — requirement appears in access rules applied by CWUIC and cross‑referenced to Title 14 access standards. § 403.1.2(a); Title 14 § 1273.01
One‑way road lane One 12‑foot traffic lane (no shoulders required); one‑way roads must meet connection/length limits. § 403.1.2(b); Title 14 § 1273.01
Max length of one‑way road 2,640 feet maximum; turnout at approximately midpoint required. § 403.1.2(b)(2); Title 14 § 1273.01
Driveway minimum lane and clearances One 10‑foot traffic lane, 14 feet unobstructed horizontal clearance, and 13 ft‑6 in (13'6") vertical clearance. § 403.1.2(c); Title 14 § 1273.01
Turnaround type for dead‑end roads CWUIC defines Dead‑end Road in § 202 and relies on Title 14/CWUIC access rules for required turnarounds (hammerhead/T allowed; Title 14 defines Hammerhead/T). § 202 and § 403; Title 14 § 1270.01(q) and § 1273.01
Fuel modification — operational requirement Fuel modification must be a method that reduces/changes nonfire‑smart vegetation and must be continuously maintained to qualify (see vegetation management plan requirements). § 202 (definition of Fuel Modification) and Appendix B101.3 (continuous maintenance required).
Defensible Space — CWUIC linkage Defensible Space defined by Title 14 is incorporated by reference; it includes establishment/maintenance of access, water reserves, road naming and fuel modification measures. CWUIC § 403.1.1 referencing Title 14 § 1270.01(f) and CWUIC § 202.

Notes on the table: the CWUIC central definitions are in § 202 and Chapter 4 (Section 403) applies access geometry and headings; Title 14 sections are called out throughout the CWUIC where the State code text applies verbatim.

How Title 14 cross‑references are presented

  • CWUIC includes Title 14 text by reprint for convenience and flags Title 14 provisions in square brackets where the CCR text is authoritative for certain definitions (for example Dead‑end Road (T14), Driveway (T14), Hammerhead/T (T14), Green Belt (T14)). See the Chapter 2 definitions cross‑reference table.
  • When CWUIC points to a Title 14 definition (marked “(T14)” in the CWUIC definitions list), use the Title 14 section cited in the CWUIC entry; the CWUIC indicates these cross‑references explicitly in the definitions table.

Exceptions & special cases

  • Roads used solely for agriculture, mining, timberland management or harvesting are exempt from the access/road standards in Section 403; CWUIC explicitly notes this exemption quoting Title 14 § 1270.03(d). Do not apply the standard 403 lane/turnaround requirements to those roads unless your local adopting ordinance states otherwise.
  • Fuel modification as a concept in CWUIC is a management method — to qualify as “fuel modification” for code compliance it must be continuously maintained (Appendix B, B101.3). Temporary clearing or one‑time removal does not meet the CWUIC definition unless maintenance is ongoing.
  • Local jurisdictions may adopt local subdivision/access standards that are more restrictive than the CWUIC; CWUIC often cross‑references the California Fire Code and Title 14, so always check the adopting ordinance and local enforcement guidance. The CWUIC notes Title 14 provisions are reprinted for convenience but are not adopted by the State Fire Marshal in the same manner as other text.

Common mistakes

  • Relying on a general (non‑code) definition of “driveway” or “road” instead of the CWUIC/Title 14 definitions in § 202 — always use the CWUIC definition for plan review.
  • Treating a one‑time brush clearance as “fuel modification” for compliance — CWUIC requires continuous maintenance per Appendix B (B101.3).
  • Omitting Title 14 cross‑references: the CWUIC flags several terms as “(T14)” — failure to read the Title 14 definition where noted leads to incorrect application (for example Hammerhead/T and Green Belt).
  • Designing a one‑way access route longer than 2,640 feet with no midpoint turnout — Title 14/CWUIC limits will be triggered.

Worked example — applying the definitions and access dimensions

Scenario: A small new subdivision will have a single road serving 8 homes. The local AHJ treats the road as a one‑way access connection.

Apply the CWUIC definitions and rules:

  1. Because CWUIC/Title 14 allow a one‑way road only to serve up to 10 residential units and with a maximum length of 2,640 feet, confirm the road length and unit count. If length ≤ 2,640 ft and units ≤ 10, the one‑way geometry may be allowed. (See § 403.1.2(b); Title 14 § 1273.01.)
  2. Provide one 12‑ft traffic lane for the one‑way section and place a turnout at approximately the midpoint (per § 403.1.2(b)).
  3. Driveways off that road: design each driveway with at least one 10‑ft lane width, 14 ft horizontal clearance and 13'6" vertical clearance per § 403.1.2(c).
  4. For vegetation: to meet the CWUIC Fuel Modification definition for defensible space adjacent to the road, implement a vegetation plan showing ongoing maintenance (Appendix B, B101.2–B101.3). One‑time thinning will not qualify.

Related provisions (CWUIC sections)

  • Definitions — § 202 (primary repository of definitions).
  • Applicability for subdivisions and individual structures — § 402 (calls to access and water supply requirements).
  • Access — § 403 (geometry, widths, driveways, one‑way/turnarounds).
  • Vegetation management / Fuel modification — Appendix B (B101.2–B101.3: plan content and continuous maintenance).
  • Defensible Space (Title 14 referenced in CWUIC Section 403.1.1) — Title 14 § 1270.01(f) as cited by CWUIC.
  • Definitions Table / Title 14 cross‑references — Chapter 2 definitions table (see the CWUIC definitions list showing T14 cross refs).

If you need, I can extract and compile the specific CWUIC and Title 14 text snippets for any of the definitions above (for use in plan submittals), or produce a one‑page checklist you can use at plan check.

Code references

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

  • CWUIC § 403.2 High relevance — show source text

    APPENDIX I-4 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

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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 § 4902.1 High relevance — show source text

    01(i)||||| ||Exterior wall assembly|Y||702A||||||| ||Exterior wall covering|Y||702A||||||| ||Fire chief|Y||||||||| ||Fire code official|Y|||202|||||| ||Fire flow calculation
    area|Y||||||||| ||Fire hazard severity
    zones|Y||702A|4902.1|||2201||| ||Fire protection plan|Y||702A|4902.1|||||| ||Fire weather|Y||||||||| ||Fire-resistance-rated
    construction|Y||||||||| ||Fire-smart vegetation|Y|||4902.1|1271.01||||| ||Flame spread index|Y||||||||| ||Fuel|Y||||||||4291(a)(1)(A)| ||Fuel break_(T14)|Y||||1270.01(n)||||| ||Fuel modification|Y||||||||| ||Fuel mosaic|Y||||||||| ||Fuel-loading|Y||||||||| ||Green belt(T14)|Y||||1270.01(o)||||| ||Greenways (T14)|Y||||1270.01(p)||||| ||Hammerhead/T (T14)|Y||||1270.01(q)||||| ||Hazardous land use
    (T14)_|Y||||1270.01(r)||||| ||Hazardous materials|Y||||||||| ||Heavy timber
    construction|Y||||||||| ||Ignition-resistant
    building material|Y||||||||| ||Local responsibility
    area (LRA)|Y||702A|4902.1|||||| ||Log wall construction|Y|||||||||

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    APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

    2025 CWUIC—continued Col2 Adopted
    Yes/No    		 IWUIC
    Section    		 CBC
    Section    		 CFC
    Section    		 Title 14,
    Division 1.5
    Section    		 Title 19,
    Division 1
    Section    		 Gov Code
    Section    		 PRC
    Section    		 HSC
    Section
    Section Title Title Title Title Title Title Title Title Title Title
    Chapter 2 Definitions Definitions Definitions Definitions Definitions Definitions Definitions Definitions Definitions Definitions
    Multilayered glazed
    panels    		 Y
    Noncombustible roof
    covering    		 Y
    Outbuilding (T14) Y 1299.02(c)
    Peer review Y
    Rafter tail Y 702A
    Registered design
    professional    		 Y
    Residential unit (T14) Y 1270.01(w)
    Ridgeline
    (topography) (T14)    		 Y 1270.01(x)
    Road (T14) Y 1270.
  • CWUIC § 402.1.1 High relevance — show source text

    402.1.1 Access. New subdivisions, as determined by this jurisdiction, shall be provided with fire apparatus access roads in accordance with the California Fire Code; the California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Article 2; and access requirements in accordance with Section 403.

    402.1.2 Water supply. New subdivisions as determined by this jurisdiction shall be provided with water supply in accordance with Section 507 of the California Fire Code; California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Article 4; and Section 404.

    402.1.2.1 Parcel map approval. Water supply requirements shall apply in the tentative and parcel map process when new parcels are approved by the local jurisdiction.

    402.2 Individual structures. Individual structures shall comply with Sections 402.2.1 and 402.2.2.

    402.2.1 Access. Individual structures hereafter constructed or relocated into or within wildland-urban interface areas shall be provided with fire apparatus access in accordance with the California Fire Code; the California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Subsection 1273; and Section 403 .

    402.2.2 Water supply. Individual structures hereafter constructed or relocated into or within wildland-urban interface areas shall be provided with a conforming water supply in accordance with the California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Article 4; California Fire Code Section 507; and Section 404.

    402.3 Existing conditions. Existing buildings shall be provided with address markers in accordance with Sections 403.2.4 and 403.2.5 . Existing roads and fire protection equipment shall be provided with markings in accordance with Sections 403.4 and 404.8, respectively.

    SECTION 403—ACCESS

    USER NOTE: The standards in Section 403 applicable to roads shall not apply to roads used solely for agriculture; mining; or the management of timberland or harvesting of forest products. [CCR, Title 14 §1270.03(d)]

    403.1 General. Roads and driveways, whether public or private, unless exempted under 14 CCR § 1270.03(d), shall provide for safe access for emergency wildfire equipment and civilian evacuation concurrently, and shall provide unobstructed traffic circulation during a wildfire emergency consistent 403.1.1 to 403.1.9. [CCR, Title 14 §1273.00]

    403.1.1 Section 403 definitions. When used in Section 403, the term listed below shall be defined as follows:

    DEFENSIBLE SPACE. The area within the perimeter of a parcel, development, neighborhood or community where basic wildland fire protection practices and measures are implemented to defend against encroaching wildfire or to escape structure fires. The perimeter as used in this regulation [CCR Title 14] is the area encompassing the parcel or parcels proposed for construction and/or development, excluding the physical structure itself. The area is characterized by the establishment and maintenance of emer- gency vehicle access, emergency water reserves, road names and identification, and fuel modification measures. [CCR Title 14 §1270.01(f)]

  • CWUIC § 4.1 High relevance — show source text

    4|Combustible
    materials|N||||||||| |A105.4.1|Individual piles|N||||||||| |A105.4.2|Separation|N||||||||| |A106|Dumping|N||||||||| |A106.1|Waste material|N||||||||| |A106.2|Ashes and coals|N||||||||| |A107|Protection of pumps
    and water storage
    facilities|N||||||||| |A107.1|General|N||||||||| |A107.2|Objective|N||||||||| |A107.3|Fuel modification
    area|N||||||||| |A107.4|Trees|N||||||||| |A107.5|Protection of electri-
    cal power supplies|N||||||||| |A108|Land use limitations|N||||||||| |A108.1|General|N||||||||| |A108.2|Objective|N||||||||| |A108.3|Permits|N||||||||| |A108.4|Access roadways|N||||||||| |A109|Referenced standards|N||||||||| |A109.1|General|N|||||||||

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    APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

    2025 CWUIC—continued Col2 Adopted
    Yes/No    		 IWUIC
    Section    		 CBC
    Section    		 CFC
    Section    		 Title 14,
    Division 1.5
    Section    		 Title 19,
    Division 1
    Section    		 Gov Code
    Section    		 PRC
    Section    		 HSC
    Section
    Section Title Title Title Title Title Title Title Title Title Title
    Appendix B Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan
    B101 General N
    B101.1 Scope N
    B101.2 Plan content N
    B101.3 Fuel modification N
    Appendix C Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework **_Community Wildland-Urban Interface (WUI)
  • CWUIC § 1.11. High relevance — show source text
    • 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.

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    APPENDIX B-2 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

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    B VEGETATION MANAGEMENT PLAN

    The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

    User notes:

    About this appendix: Appendix B, while not part of the code, can become part of the code when specifically included in the adopting ordinance. Its purpose is to provide criteria for submitting vegetation management plans, specifying their content and establishing a criterion for considering vegetation management as being a fuel modification.

    SECTION B101—GENERAL

    B101.1 Scope. Vegetation management plans shall be submitted to the code official for review and approval as part of the plans required for a permit.

    B101.2 Plan content. Vegetation management plans shall describe all actions that will be taken to prevent a fire from being carried toward or away from the building. A vegetation management plan shall include the following information:

    1. A copy of the site plan.
    2. Methods and timetables for controlling, changing or modifying areas on the property. Elements of the plan shall include removal of slash, snags, vegetation that may grow into overhead electrical lines, other ground fuels, ladder fuels and dead trees, and the thinning of live trees.
    3. A plan for maintaining the proposed fuel-reduction measures.

    B101.3 Fuel modification. To be considered a fuel modification for purposes of this code, continuous maintenance of the clearance is required.

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    CALIFORNIA WILDLAND-URBAN INTERFACE CODE – MATRIX ADOPTION TABLE APPENDIX C – COMMUNITY WILDLAND-URBAN INTERFACE (WUI) FIRE HAZARD EVALUATION FRAMEWORK

  • CWUIC § 1.5 High relevance — show source text

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    APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS

    2025 CWUIC—continued Col2 Adopted
    Yes/No    		 IWUIC
    Section    		 CBC
    Section    		 CFC
    Section    		 Title 14,
    Division 1.5
    Section    		 Title 19,
    Division 1
    Section    		 Gov Code
    Section    		 PRC
    Section    		 HSC
    Section
    Section Title Title Title Title Title Title Title Title Title Title
    Chapter 2 Definitions Definitions Definitions Definitions Definitions Definitions Definitions Definitions Definitions Definitions
    Multilayered glazed
    panels    		 Y
    Noncombustible roof
    covering    		 Y
    Outbuilding (T14) Y 1299.02(c)
    Peer review Y
    Rafter tail Y 702A
    Registered design
    professional    		 Y
    Residential unit (T14) Y 1270.01(w)
    Ridgeline
    (topography) (T14)    		 Y 1270.01(x)
    Road (T14) Y 1270.01(y)
    Roof assembly Y
    Roof covering Y
    Roof covering system Y
    Roof deck Y
    Roof eave Y 702A
    Roof eave soffit Y 702A
    Slope Y
    State Responsibility
    Area (SRA)    		 Y 702A 4902.1
    Strategic
    ridgeline (T14)    		 Y 1270.01(dd)
    Structure Y 202 1270.01(ee)
    Subdivision Y
    Tree crown Y
    Undeveloped
    ridgeline (T14)    		 Y 1270.01(ii)
    Unenclosed acces-
    sory structure    		 Y
    Vertical curve (T14) Y 1270.01(k)
    Wildfire Y 702A 4902.1
    Wildfire exposure Y 702A 4902.1
    Wildland Y
    Wildland-urban inter-
    face area    		 Y 702A 4902.1
    Chapter 3 Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas Wildland-urban interface areas
    301 General Y
    301.1 Scope Y 4201
    301.
  • CWUIC § B101 High relevance — show source text

    SECTION B101—GENERAL

    B101.1 Scope. Vegetation management plans shall be submitted to the code official for review and approval as part of the plans required for a permit.

    B101.2 Plan content. Vegetation management plans shall describe all actions that will be taken to prevent a fire from being carried toward or away from the building. A vegetation management plan shall include the following information:

    1. A copy of the site plan.
    2. Methods and timetables for controlling, changing or modifying areas on the property. Elements of the plan shall include removal of slash, snags, vegetation that may grow into overhead electrical lines, other ground fuels, ladder fuels and dead trees, and the thinning of live trees.
    3. A plan for maintaining the proposed fuel-reduction measures.

    B101.3 Fuel modification. To be considered a fuel modification for purposes of this code, continuous maintenance of the clearance is required.

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    CALIFORNIA WILDLAND-URBAN INTERFACE CODE – MATRIX ADOPTION TABLE APPENDIX C – COMMUNITY WILDLAND-URBAN INTERFACE (WUI) FIRE HAZARD EVALUATION FRAMEWORK

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

    (Not adopted by the State Fire Marshal)

    Adopting Agency BSC BSC-
    CG    		 SFM Col5 HCD Col7 Col8 DSA Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting Agency BSC BSC-
    CG    		 T-24 T-19* 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended sections
    listed below)
    Adopt only those sections that
    are listed below
    [California Code of Regulations,
    Title 19, Division 1]
    Chapter / Section
  • CWUIC § 1270.01 High relevance — show source text

    FUEL MODIFICATION. A method of modifying fuel load by reducing the amount of nonfire-smart vegetation or altering the type of vegetation to reduce the fuel load.

    FUEL MOSAIC. A fuel modification system that provides for the creation of islands and irregular boundaries to reduce the visual and ecological impact of fuel modification.

    FUEL-LOADING. The oven-dry weight of fuels in a given area, usually expressed in pounds per acre (lb/a) (kg/ha). Fuel-loading may be referenced to fuel size or time-lag categories, and may include surface fuels or total fuels.

    GREEN BELT (applicable to CCR, Title 14 provisions only). Open space, parks, wildlands, other areas or a combination thereof, as desig- nated by Local Jurisdictions, which are in, surround or are adjacent to a city or urbanized area, that may function as Fuel Breaks and where Building construction is restricted or prohibited. [CCR Title 14 §1270.01(o)]

    GREENWAYS (applicable to CCR, Title 14 provisions only). Linear open spaces or corridors that link parks and neighborhoods within a community through natural or manmade trails and paths. [CCR Title 14 §1270.01(p)]

    HAMMERHEAD/T (applicable to CCR, Title 14 provisions only). A “T” shaped, three-point turnaround space for fire apparatus on a road or driveway, being no narrower than the road or driveway that serves it. [CCR Title 14 §1270.01(q)]

    HAZARDOUS LAND USE (applicable to CCR, Title 14 provisions only). A land use that presents a significantly elevated potential for the igni- tion, prolonged duration or increased intensity of a wildfire due to the presence of flammable materials, liquids or gasses, or other features that initiate or sustain combustion. Such uses are determined by the local jurisdiction and may include, but are not limited to, power-generation and distribution facilities; wood processing or storage sites; flammable gas or liquids processing or storage sites; or shooting ranges. [CCR Title 14 §1270.01(r)]

    HAZARDOUS MATERIALS. As defined in the California Fire Code .

    HEAVY TIMBER CONSTRUCTION. As described in the California Building Code .

    IGNITION-RESISTANT BUILDING MATERIAL. A type of building material that resists ignition or sustained flaming combustion sufficiently so as to reduce losses from wildfire exposure of burning embers and small flames.

    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. See also “State Responsibility Area (SRA).”

    LOG WALL CONSTRUCTION. A type of construction in which exterior walls are constructed of solid wood members and where the smallest horizontal dimension of each solid wood member is not less than 6 inches (152 mm).

    MULTILAYERED GLAZED PANELS. Window or door assemblies that consist of two or more independently glazed panels installed parallel to each other, having a sealed air gap in between, within a frame designed to fill completely the window or door opening in which the assembly is intended to be installed.

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    DEFINITIONS

  • CWUIC § 4-1 High relevance — show source text

    2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE 4-1

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    4 WILDLAND-URBAN INTERFACE AREA REQUIREMENTS

    User notes:

    About this chapter: Chapter 4 provides requirements that apply to all occupancies in the wildland-urban interface and pertain to all of the following:

    1. Fire service access to the property that is to be protected, including fire apparatus access roads and off-road driveways.

    2. Premises identification.

    3. Key boxes to provide ready access to properties secured by gated roadways or other impediments to rapid fire service access.

    4. Fire protection water supplies, including adequate water sources, pumper apparatus drafting sites, fire hydrant systems and system reliability.

    5. Fire department access to equipment such as fire suppression equipment and fire hydrants.

    SECTION 401—GENERAL

    401.1 Scope. Wildland-urban interface areas shall be provided with emergency vehicle access and water supply in accordance with this chapter.

    401.2 Objective. The objective of this chapter is to establish the minimum requirements for emergency vehicle access and water supply for buildings and structures located in the wildland-urban interface areas.

    401.3 General safety precautions. General safety precautions shall be in accordance with this chapter. See also Appendix A.

    SECTION 402—APPLICABILITY

    402.1 Subdivisions. Subdivisions shall comply with Sections 402.1.1 and 402.1.2.

    402.1.1 Access. New subdivisions, as determined by this jurisdiction, shall be provided with fire apparatus access roads in accordance with the California Fire Code; the California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Article 2; and access requirements in accordance with Section 403.

    402.1.2 Water supply. New subdivisions as determined by this jurisdiction shall be provided with water supply in accordance with Section 507 of the California Fire Code; California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Article 4; and Section 404.

    402.1.2.1 Parcel map approval. Water supply requirements shall apply in the tentative and parcel map process when new parcels are approved by the local jurisdiction.

    402.2 Individual structures. Individual structures shall comply with Sections 402.2.1 and 402.2.2.

    402.2.1 Access. Individual structures hereafter constructed or relocated into or within wildland-urban interface areas shall be provided with fire apparatus access in accordance with the California Fire Code; the California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Subsection 1273; and Section 403 .

    402.2.2 Water supply. Individual structures hereafter constructed or relocated into or within wildland-urban interface areas shall be provided with a conforming water supply in accordance with the California Code of Regulations, Title 14, Division 1.5, Chapter 7, Subchapter 2, Article 4; California Fire Code Section 507; and Section 404.

  • CWUIC § 1-2 High relevance — show source text

    Population growth and the expanding urban development into traditionally nonurban areas have increasingly brought humans into contact with wildfires. According to the National Fire Protection Agency (NFPA), every year, wildfires burn across the United States and a growing number of people are living where wildfires are a real risk. In 2018 more than 58,000 fires burned nearly 9 million acres across the US. More than 25,000 structures were destroyed, including 18,137 residences and 229 commercial structures. California accounted for the highest number of structures lost in one state due to the number of significant fires, including the Mendocino Complex, Carr, Camp and Woolsey fires.

    The IWUIC is a model code that is intended to be adopted and used supplemental to the adopted building and fire codes of a jurisdiction. The unrestricted use of property in wildland-urban interface areas is a potential threat to life and property from fire and resulting erosion. The IWUIC has as its objective the establishment of minimum special regulations for the safeguarding of life and

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    property from the intrusion of fire from wildland fire exposures and fire exposures from adjacent structures and to prevent structure fires from spreading to wildland fuels, even in the absence of fire department intervention.

    Safeguards to prevent the occurrence of fires and to provide adequate fire protection facilities to control the spread of fire in wildland-urban interface areas are provided in a tiered manner commensurate with the relative level of hazard present.

    ARRANGEMENT AND FORMAT OF THE 2025 CWUIC

    The format of the CWUIC allows each chapter to be devoted to a particular subject. The following table shows how the CWUIC is divided. The chapter synopses detail the scope and intent of the provisions of the CWUIC.

    CHAPTER TOPICS Col2
    CHAPTER SUBJECT
    1-2 Administration and Definitions
    3-4 Wildland-Urban Interface Area Designation and Requirements
    5 Building Construction Regulations
    6 Fire Protection Requirements
    7 Referenced Standards
    Appendices A-I Adoptable and Informational Appendices

    Chapter 1 Scope and Administration.

    Chapter 1 establishes the limits of applicability of the code and describes how the code is to be applied and enforced. The provisions of Chapter 1 establish the authority and duties of the code official appointed by the authority having jurisdiction and also establish the rights and privileges of the design professional, contractor and property owner.

    Chapter 2 Definitions.

    Chapter 2 is the repository of the definitions of terms used in the body of the code. The user of the code should be familiar with and consult this chapter because the definitions are essential to the correct interpretation of the code and because the user may not be aware that a term is defined.

    Chapter 3 Wildland-Urban Interface Areas.

    Chapter 3 provides for the fundamental aspect of applying the code—the legal declaration and establishment of wildland-urban interface areas within the adopting jurisdiction, mapping of the area, periodic review and updates.

    Chapter 4 Wildland-Urban Interface Area Requirements.

    The requirements of Chapter 4 apply to all occupancies in the wildland-urban interface and pertain to all of the following:

    1. Fire service access to the property that is to be protected, including fire apparatus access roads and off-road driveways.

    2. Premises identification.

  • CWUIC § 402.3 High relevance — show source text

    402.3 Existing conditions. Existing buildings shall be provided with address markers in accordance with Sections 403.2.4 and 403.2.5 . Existing roads and fire protection equipment shall be provided with markings in accordance with Sections 403.4 and 404.8, respectively.

    SECTION 403—ACCESS

    USER NOTE: The standards in Section 403 applicable to roads shall not apply to roads used solely for agriculture; mining; or the management of timberland or harvesting of forest products. [CCR, Title 14 §1270.03(d)]

    403.1 General. Roads and driveways, whether public or private, unless exempted under 14 CCR § 1270.03(d), shall provide for safe access for emergency wildfire equipment and civilian evacuation concurrently, and shall provide unobstructed traffic circulation during a wildfire emergency consistent 403.1.1 to 403.1.9. [CCR, Title 14 §1273.00]

    403.1.1 Section 403 definitions. When used in Section 403, the term listed below shall be defined as follows:

    DEFENSIBLE SPACE. The area within the perimeter of a parcel, development, neighborhood or community where basic wildland fire protection practices and measures are implemented to defend against encroaching wildfire or to escape structure fires. The perimeter as used in this regulation [CCR Title 14] is the area encompassing the parcel or parcels proposed for construction and/or development, excluding the physical structure itself. The area is characterized by the establishment and maintenance of emer- gency vehicle access, emergency water reserves, road names and identification, and fuel modification measures. [CCR Title 14 §1270.01(f)]

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    WILDLAND-URBAN INTERFACE AREA REQUIREMENTS

    403.1.2 Width.

    (a) All Roads shall be constructed to provide a minimum of two ten-foot traffic lanes, not including shoulder and striping. These traffic lanes shall provide for two-way traffic flow to support emergency vehicle and civilian egress, unless other standards are provided in this article or additional requirements are mandated by local jurisdictions or local subdivision requirements. Verti- cal clearances shall conform to the requirements in California Vehicle Code Section 35250. (b) All one-way roads shall be constructed to provide a minimum of one twelve-foot traffic lane, not including Shoulders. The Local Jurisdiction may approve One-way Roads. (1) All one-way roads shall, at both ends, connect to a road with two traffic lanes providing for travel in different directions, and shall provide access to an area currently zoned for not more than ten (10) Residential Units. (2) In no case shall a One-way Road exceed 2,640 feet in length. A turnout shall be placed and constructed at approximately the midpoint of each One-way Road. (c) All Driveways shall be constructed to provide a minimum of one (1) ten-foot traffic lane, fourteen (14) feet unobstructed hori- zontal clearance, and unobstructed vertical clearance of thirteen feet, six inches (13' 6”).

    [CCR, Title 14 §1273.01]

    403.1.3 Road surfaces.

  • CWUIC § 601.3 Medium 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

Frequently asked questions

What is the single authoritative definition to use when a term appears in multiple places?

Use the CWUIC § 202 definition first; when the CWUIC flags a term as “(T14)” use the Title 14 section cited in the CWUIC entry.

Is a one‑time fuel thinning considered “fuel modification” for code compliance?

No — Appendix B requires continuous maintenance for a treatment to qualify as fuel modification under the CWUIC.

Do the CWUIC road dimensions apply to agricultural roads?

No — Section 403 standards for roads do not apply to roads used solely for agriculture, mining, timber management or harvesting (Title 14 exemption cited in CWUIC).

Where does CWUIC tell me the required driveway clearances?

Driveway lane and clearance values are given in the access rules applied by CWUIC (see § 403.1.2(c) and the Title 14 cross‑reference § 1273.01).

If CWUIC points to Title 14, which text controls?

The CWUIC reproduces Title 14 provisions for convenience and marks them with (T14). For the exact legal wording, refer to the cited Title 14 section; CWUIC will tell you which Title 14 section to consult.

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California Wildland-Urban Interface Code