Affordable adu construction in San Jose, CA
Affordable adu construction in San Jose, California. Budget jobs start near the low end of $207,000 – $414,000.
Low
$207,000
Average
$310,500
High
$414,000
San Jose crews quote about $345 – $690 per square foot.
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What drives adu construction prices in San Jose
Local labor, permitting and climate move San Jose prices away from the national average.
Labor market
Silicon Valley labor is among the priciest in the country, with skilled trades in short supply.
Permits
San Jose requires permits for nearly all remodels; plan check can add 2-4 weeks.
Climate
Mild climate keeps material demands modest, but seismic detailing adds cost.
Ways to lower your San Jose price
- Use pre-approved ADU plans where your city offers them — saves months and design fees.
- Detach only if required; attached and conversion ADUs cost far less.
- Collect three written bids on an identical scope — spreads of 20–40% are normal.
- Book in the off-season and stay flexible on the start date to save 5–15%.
- Bundle nearby work into one mobilization so you only pay setup and travel once.
- Ask what the contractor would change to cut 10% without hurting durability.
San Jose questions
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