ADU / granny flat cost in Sacramento & the Bay Area
Contractors declared a value on 2,079 ADU permits in 2025–26 in the cities we track (Sacramento, Elk Grove, West Sacramento, San Francisco, San Jose, Marin County). Half of the jobs fall between $74,928 and $198,804; the median is $126,634. A declared value is what the contractor reported to the city, so your quote can be higher or lower, and prices differ from city to city.
$74,928Low (25%)
$126,634Median
$198,804High (75%)
2,079Permits