Shed Rules: Sonora vs Twain Harte

Do I need a permit for a shed in Sonora?

Sheds over 120 square feet typically require a building permit under the California Building Code. Smaller structures may be exempt.

Can I convert my shed into an ADU?

Yes. Under California Government Code section 65852.2, existing accessory structures can be converted to ADUs with exemptions from additional development standards.

What setbacks apply to sheds in Sonora?

Setback requirements vary by zoning district under Title 17. Contact Community Development at 209-532-3508 for your specific zone.

Do I need a permit for a small shed in Twain Harte?

Tuolumne County has adopted the 2022 California Residential Code, and CRC Section R105.2 generally exempts a one-story detached storage shed 120 square feet or less from a building permit. Title 17 zoning setbacks still apply, and any electrical or plumbing work in the shed needs its own permit. Confirm with the Tuolumne County Building Division at 209-533-5633.

How close to my property line can a shed sit in Twain Harte?

Setbacks for accessory structures depend on the parcel's R district under Tuolumne County Title 17 and are not the same on every lot. Confirm the side, rear, and front yard setbacks for your specific zone with the Community Development Department at 209-533-5637 or 48 Yaney Avenue in Sonora before building.

Does the wildfire zone change my shed requirements?

Twain Harte is in a CAL FIRE State Responsibility Area and a High Fire Hazard Severity Zone. Qualifying structures may need to meet California Residential Code Chapter 7A wildfire-resistant materials, and the parcel must keep 100 feet of defensible space under Public Resources Code Section 4291. Confirm whether your shed triggers Chapter 7A with the Building Division.