San Carlos ADU topic page
San Carlos 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
One bedroom or less: 850 square feet Two+ bedrooms: 1000 square feet Conversion of existing legally established detached structures: None JADU: 500 square feet *50% of main home floor area, unless under 800 square feet (state law allows an ADU up to 800 square feet on...
Setbacks and parking
First floor attached and detached: Side and rear – 4 feet, Front: setbacks determined by base zoning district The second floor is attached: determined by the base zoning district The second floor is attached on reversed corner lots: rear – 5 feet JADUs: Any parking...