San Bernardino adu construction pricing per square foot
ADU Construction cost per square foot in San Bernardino, California in 2026.
Low
$154,500
Average
$231,800
High
$309,000
San Bernardino crews quote about $260 – $515 per square foot.
Multiply local unit rates by your real measurements.
What drives adu construction prices in San Bernardino
Local labor, permitting and climate move San Bernardino prices away from the national average.
Labor market
Some of the most affordable licensed labor in Southern California.
Permits
County and city permits apply to most exterior projects.
Climate
High summer heat and occasional wildfire exposure affect material choice.
San Bernardino unit pricing by material
Ways to lower your San Bernardino 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 Bernardino questions
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