San Diego County, CA Building Safety: Building Permits (2026)
Key Facts
- Permit required
- Reroof work needs a building permit
- Fire-rating trigger
- Over 50% of roof or 2,500 sq ft
- Standard triggered
- Entire roof must be Class A rated
- Enforcing agency
- Planning & Development Services building official
- Historic exception
- Wood roofs allowed on qualified historic buildings
Summary
In unincorporated San Diego County, roof repair or replacement needs a building permit, and reroofing more than 50% of the roof area (or 2,500 sq. ft.) in one year triggers a Class A fire-rated covering requirement for the entire roof.
The roof covering for every new structure and addition to an existing structure shall be fire-retardant, that is at least Class A rated in accordance with ASTM E 108 or UL 790. A construction project for an addition to an existing structure, or the alteration, repair, recover, or partial replacement of an existing roof, that involves more than 50 percent of the roof area of the existing structure or 2,500 square feet, whichever is less, within any one year period, shall require that the entire structure's roof covering complies with this section. For the purposes of this section, gambrel roofs, mansard roofs and other similar roof configurations shall be considered roofs regardless of the steepness of the roof pitch. Exceptions:
1. The roof covering of a building not classified as an R-3 or U occupancy may have a minimum Class B rating when not located in a wildland- urban interface fire area.
2. On a qualified historical building a wood roof covering may be repaired or reconstructed as allowed by the State Historical Building Code.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-141: Administrative: Current through Ord. No. 11007 (N.S.), effective 7-10-26 | Regulatory: Current through Ord. No. 11008 (N.S.), effective 7-24-26).
Full Breakdown
County Code § 91.1.105.1 requires a building permit before anyone repairs, alters or replaces a roof: reroofing is not on the § 91.1.105.2 list of permit-exempt work. Substantively, § 92.1.1505 requires all new roofs to be at least Class A fire-rated, and if a repair, recover or partial replacement job covers more than 50% of the existing roof area (or 2,500 sq. ft., whichever is less) within any one-year period, the entire roof must be brought up to that Class A standard. Homes in a wildland-urban interface fire area face an added layer of requirements under the California Wildland-Urban Interface Code. Permits are reviewed and issued by the Department of Planning & Development Services building official.
Violations & Fines
Reroofing without a permit is unpermitted construction; the building official can issue a stop-work order and require the owner to obtain a permit and correct any portion of the roof that doesn't meet the Class A fire-rating threshold.
Frequently Asked Questions
Do I need a permit to reroof my house in unincorporated San Diego County?
How much of my roof can I replace before the whole roof must meet fire code?
Sources & Official References
Other rules in San Diego County
California rules heatmap·Compare San Diego County to another location·View the California building safety overview
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