Per California Residential Code Section R301 as adopted by Marin County, all new single-family dwellings must be designed for: wind exposure category C, seismic design category D2 (high seismicity per ASCE 7 mapping for the Hayward-Rodgers Creek fault system), and ground snow load 0 psf except for elevations above 1500 ft where 10 psf applies. Reference: 2022 CRC R301.2.1, R301.2.2.