Honest 2026 pricing for Westside ADU projects. These ranges are installed cost — design, permit, construction, and standard finishes — based on jobs we've actually closed in this market.
Installed cost ranges
Detached new-build
$475–$625/sqft
Garage / interior conversion
$275–$400/sqft
Why Westside prices look like this
☐Westside labor and dump fees price 8–12% above LA County median.
☐Coastal Zone parcels often add $15–40k in CDP consultant + biology survey costs.
☐Santa Monica seismic retrofit pairing on a duplex can add $35–80k tied to the ADU permit cycle.
☐Tight street parking (Venice, Mar Vista) drives crane / pump days higher than Valley jobs.
How to read these numbers
These are total installed $/sqft, not just construction. The detached range assumes a clean 600–900 sqft new-build with mid-range finishes. Conversions price lower because the shell already exists — most cost lives in plumbing, electrical, and the kitchen. Move outside these ranges and we'll tell you why before you sign anything.