Renovation and remodel work in Napa requires building, electrical, plumbing, and/or mechanical permits issued by the Napa Building Division under Title 15 of the Napa Municipal Code (which adopts the 2022 California Building Standards Codes). Permits are processed through the City's Community Development Department.
Napa Municipal Code Title 15 adopts the 2022 California Building Standards Code, including the California Building Code, California Residential Code, California Electrical Code, California Plumbing Code, California Mechanical Code, California Energy Code, California Green Building Standards Code (CALGreen), and California Fire Code. Under CBC and CRC Section R105, a permit is required for any construction, alteration, repair, addition, moving, demolition, or change of occupancy of a building or structure, with limited exemptions for minor repairs (typical examples: replacement of less than the entire roof covering, like-for-like fixture swaps, fences 7 feet or shorter at least 10 feet from public right-of-way, painting and wallpaper, simple cabinet work). Common Napa renovations that DO require permits include: kitchen and bathroom remodels (electrical, plumbing, structural); window or door replacements (window U-factor and Title 24 energy compliance); reroofs; water heater replacements (T&P, seismic strapping, expansion tank); HVAC equipment changes; electrical panel upgrades and EV-charger circuits; room additions; ADU and JADU construction; garage conversions; and structural work. In Very High Fire Hazard Severity Zones (covering much of the hillside neighborhoods around Napa), substantial remodels also trigger Chapter 7A WUI material upgrades. For pre-1978 homes in Old Town, Fuller Park, and other older neighborhoods, EPA RRP lead-safe work practices apply on top of the building permit. Inspections are scheduled through the Napa Community Development Department and performed by Napa Building Inspection staff.
Work performed without a required permit is a violation of Title 15 (adopted CBC/CRC Section R105). The Napa Building Division can issue a stop-work order, require an after-the-fact permit (often at an investigation-fee multiple of the standard fee under the City's policy), require exposure of concealed framing, plumbing, or electrical work for inspection, and require corrective work. Selling a Napa home with significant unpermitted work also creates civil-disclosure liability under California Civil Code Section 1102.
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