The cheapest safe way to do adu construction in San Diego
Affordable adu construction in San Diego, California. Budget jobs start near the low end of $177,000 – $354,000.
Low
$177,000
Average
$265,500
High
$354,000
San Diego crews quote about $295 – $590 per square foot.
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What drives adu construction prices in San Diego
Local labor, permitting and climate move San Diego prices away from the national average.
Labor market
San Diego contractors price near the California average, with coastal ZIPs at a premium.
Permits
City of San Diego permits apply to most exterior and structural work; coastal overlay adds review time.
Climate
Marine air corrodes fasteners and finishes near the coast, so upgraded materials are common.
Ways to lower your San Diego 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 Diego questions
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