
ADU engineering in San Francisco County is tailored for regional topography, county-level seismic and wildfire risk assumptions, and unincorporated permit-path requirements. Permitting is typically handled by the City and County of San Francisco building authority. The city-county has dense built conditions and frequent slope variation, with seismic design context throughout.
San Francisco County ADU projects require structural planning for regional terrain variation, county-wide seismic and wildfire criteria, and unincorporated permit pathways. San Francisco County ADU projects are primarily urban infill within existing multifamily and single-family building envelopes. Most projects involve interior conversions, lower-level unit creation, or constrained additions rather than detached backyard units.
Single-family ADUs are secondary housing units that are located on the same lot as a single-family home. These units are also sometimes referred to as granny flats, in-law suites or backyard cottages.
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Yes. Permitting is typically handled by the City and County of San Francisco building authority.
The city-county has dense built conditions and frequent slope variation, with seismic design context throughout.
San Francisco County ADU projects are primarily urban infill within existing multifamily and single-family building envelopes. Most projects involve interior conversions, lower-level unit creation, or constrained additions rather than detached backyard units.

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