Placer County begins local adoption of 2025 California building code; staff warns of higher snow-load and WUI standards

The Placer County Board of Supervisors on Nov. 4 introduced an ordinance to adopt the 2025 California Building Standards Code as amended locally. Building Services staff said the state-level update incorporates revised snow-load calculations based on the American Society of Civil Engineers standard ASCE 7-22 and consolidates wildfire-related construction and mitigation standards into a new Part 7.

Tim Wagner, deputy director and chief building official, told the board the updated snow-load methodology will significantly affect mountain and high-country areas, citing Serene Lakes and Bridal Gorge as examples where ground snow-load figures increased substantially. "Snow loads in some areas of the county have doubled," Wagner said, noting the change will require stronger structural designs and, in some cases, a shift to different construction materials.

Wagner said the new Part 7 merges multiple wildfire-related standards (including Chapter 7A and CAL FIRE regulations) to streamline compliance and focus on home-hardening and fire-resistant construction materials. He said local fire agencies will continue to enforce parcel-specific requirements such as road widths, turnouts and water supply.

The staff's only recommended local amendment would align Placer County's pool barrier standards with state health and safety requirements and add a limited exception for parcels of three acres or larger.

During discussion Supervisor Gustafson asked staff to quantify the downstream cost impacts for housing projects and modular/manufactured housing so the board could better understand affordability implications. Wagner said he would work with the local engineers association to produce sample cost estimates.

The board introduced the ordinance and asked staff to return with additional cost analyses and implementation guidance; a final adoption vote is expected at a subsequent meeting.