Sierra County, CA Fence Regulations: Permit Requirements (2026)

Sierra County's building code (SCC Chapter 12.04) governs when a permit is required, and the exemption section (SCC 12.04.030) expressly states that, in addition to the categories outlined in the California Residential Code Section R105.2 and California Building Code Section 105.2, certain additional work is exempt from a building permit. Under those state code sections, a fence not over 7 feet high (light materials) is permit-exempt, while taller fences and most masonry walls require a permit. Importantly, SCC 12.04.030 adds a critical condition: any exempt structure must still comply with county zoning standards, the county floodplain management code, and the materials and construction methods for exterior wildfire exposure required under CBC Chapter 7A and CRC Section R327. That wildfire clause matters in Sierra County, which lies largely in fire-prone Sierra Nevada terrain. The same chapter also exempts one-story detached accessory structures (such as sheds) up to 120 square feet with no electrical or plumbing. So even when a fence is exempt from a building permit, owners should confirm with the Planning Department that the placement complies with setbacks and that fence materials meet any wildfire requirements. Contact Sierra County Planning and Building in Downieville to verify current requirements before starting work.