Foster City ADU topic page
Foster City ADU Rules
Start with the official local ADU rules, then confirm lot-specific limits before requesting provider quotes.
Short answer
Start with the official local ADU rules, then confirm lot-specific limits before requesting provider quotes.
Source requirement: Official city or county rule source parsed and cited.
Local rule evidence
Size
Min:150 square feet Max ADU in single-family zoning districts: 1200 square feet or 50% of main home floor area (whichever is less), unless under 800 square feet (state law allows an ADU up to 800 square feet on every property, some exceptions may apply) Max ADU in...
Setbacks and parking
Side and Rear: 4 feet Front: may not be located in the front yard. JADUs: No parking required ADUs: One spot may be required (tandem allowed). No parking required if: The ADU is located within one-half mile walking distance of public transit. The ADU is a conversion...