ADU Permit Requirements in Granite Bay, CA
Granite Bay is an unincorporated community in Placer County with no city government; Placer County Building Services is the AHJ. As of Jan 1, 2026 the county enforces the 2025 California Building Standards Code including the 2025 CRC and Part 7 Wildland-Urban Interface Code. Some Granite Bay parcels fall in the WUI and require ignition-resistant construction.
By Joey, Founder · Last verified May 31, 2026 · How we research →
When you need a ADU permit
Accessory dwelling units (ADUs) and junior ADUs are streamlined under California state ADU law (AB 68, AB 881, SB 13). Placer County Building Services must approve a compliant ADU within 60 days, with no minimum lot size, 4-foot side and rear setbacks, and reduced impact fees. The ADU follows the 2025 California Residential Code (Title 24 Part 2.5, based on the 2021 IRC) plus the California Energy Code. Submit through the county e-permits portal at permits.placer.ca.gov. Placer County also enforces the 2025 California Wildland-Urban Interface Code (Title 24 Part 7); parcels in the WUI must use ignition-resistant exterior materials.
ADU Permit Costs: Granite Bay vs. Nearby
| City | Estimated Fee |
|---|---|
| Granite Bay | N/A |
| Los Angeles | $750 – $7,500 |
| Sacramento County | $750 – $7,500 |
| San Diego | $750 – $7,500 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Granite Bay permit costs →
Zoning Considerations
ADU regulations vary dramatically by state and city. Many states (CA, OR, WA) have preemption laws that override local zoning restrictions. Check both state law and local zoning before designing.
Estimated Project Timeline
Here's a typical timeline for a adu project:
Timeline is based on the typical about 9 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Contact the building department for current ADU permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller ADU projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for ADU permits is about 9 weeks. More complex projects may take longer if plan review is required.
Learn More About ADU Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read ADU Guide →