ADU rules by city

Each page shows what the city allows, what it charges, and the licensed builders that list it. Read from the city's own pages on Oct 18, 2026.

City	Detached, max	Height	Side and rear setback	City fees, 750 sq ft	Builders
South Bay
Campbell	1,200 sq ft	20 ft	4 ft	not published	9
Cupertino	1,000 sq ft	18 ft	4 ft	not published	12
Los Gatos	1,200 sq ft	16 ft	4 ft	not published	12
Milpitas	1,200 sq ft	16 ft	4 ft	$5,255	8
San Jose	1,200 sq ft	18 ft	4 ft	$13,092	18
Santa Clara	1,200 sq ft	18 ft	4 ft	not published	13
Saratoga	1,200 sq ft	16 ft	4 ft	not published	12
Sunnyvale	1,000 sq ft	16 ft	4 ft	not published	13
Peninsula
Burlingame	1,000 sq ft	16 ft	4 ft	not published	7
Los Altos	1,200 sq ft	18 ft	4 ft	not published	11
Mountain View	1,000 sq ft	28 ft	4 ft	not published	13
Palo Alto	1,000 sq ft	16 ft	4 ft	$7,346	13
Redwood City	1,200 sq ft	16 ft	4 ft	$5,322	8
San Mateo	800 sq ft	24 ft	4 ft	$2,832	10
San Francisco
San Francisco	1,000 sq ft	18 ft	4 ft	not published	8
East Bay
Berkeley	1,200 sq ft	25 ft	4 ft	not published	9
Fremont	1,200 sq ft	16 ft	4 ft	not published	10
Oakland	1,000 sq ft	20 ft	4 ft	not published	11

Detached size and height are the city's limit for a one-story detached ADU on a single-family lot. Some cities allow more on larger lots; the city page has the details.