Millbrae ADU topic page
Millbrae 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 one bedroom or less: 850 square feet, two + bedrooms: 1000 square feet Maximum 50% of main home floor area. Max JADU: 500 square feet
Setbacks and parking
Attached: side and rear – 4 feet, front – determined by base zoning district Detached: side and rear – 4 feet, front – determined by base zoning district, 5 feet from primary residence JADUs: No parking required ADUs: One spot may be required (tandem allowed). No...