Permit Sonoma's rule
B-07 requires a Class A roof assembly when more than 50% of an existing roof is re-roofed in unincorporated Sonoma County. Slate, tile, concrete and metal installed per the manufacturer are treated as equivalent to Class A.
Napa and Marin
Check your address on the 2025 state fire hazard severity zone map. FIRESafe MARIN publishes home-hardening guidance for Marin. Napa County and each city apply the state rule and their own codes.
Materials
| Material | Class A? |
|---|---|
| Asphalt shingle | Generally yes |
| Concrete, clay, masonry tile | Generally yes |
| Metal shingles or sheets | Generally yes |
| Wood shake | No |
Source: CDI Safer from Wildfires.
The insurance side
A Class A roof is one of the Safer from Wildfires mitigation actions insurers recognize with discounts. In wine country, it's often the first roof question an underwriter asks.
Every roofer we work with is licensed, insured and highly reviewed by Bay Area homeowners.
Get a free replacement quoteFrequently asked questions
Does B-07 apply inside Santa Rosa city limits?
B-07 is Permit Sonoma's bulletin for unincorporated Sonoma County. Santa Rosa applies its own code; confirm with the city.
Is a tile roof Class A?
Permit Sonoma treats tile installed per the manufacturer as equivalent to Class A, and CDI lists tile among roofs that generally qualify.
Do I need ember-resistant vents?
In fire zones, vents are a common requirement and a key ember entry point; ask your building department.
Sources
- Permit Sonoma B-07: Class A roof requirements
- OSFM: fire hazard severity zone maps
- FIRESafe MARIN
- CDI: Safer from Wildfires
Sources reviewed November 11, 2026. Figures are published estimates and official fees, not quotes. Confirm prices, permits and requirements with your contractor and building department. This page is general information, not legal or insurance advice.