Looking for adu construction in San Mateo? ODL Construction is a licensed Bay Area general contractor serving San Mateo and the surrounding Peninsula — from San Mateo Park, Aragon, Hillsdale and beyond. Detached, attached, and garage-conversion ADUs — rental income and family space, fully permitted.
Accessory Dwelling Units are the single best way to add value, income, or multigenerational space to a Bay Area property — and California's pro-ADU laws have made them faster to approve than almost any other project. A well-built ADU can rent for thousands a month, house family with independence, and — under California's new AB 1033 — even be sold separately like a condo where your city adopts it.
For San Mateo specifically, it comes down to local realities: San Mateo's mix of period San Mateo Park homes and mid-century neighborhoods rewards remodels that match the era — generic finishes underperform here. San Mateo's building department is established and consistent; older neighborhoods can add character and tree considerations on exterior work. We design and permit your adu construction around exactly those conditions.
ADU Construction in San Mateo — what we handle
- Detached new-construction ADUs
- Attached ADUs
- Garage and basement conversions
- Junior ADUs (JADUs)
- Feasibility, lot, and setback analysis
- California ADU law and local ordinance compliance
- Utility connections and Title 24 energy compliance
- Full permitting and inspections
ADU Construction cost in San Mateo
There's no honest one-size-fits-all price in construction — the true cost of your project depends on scope, size, materials, engineering, permits, and site conditions. That's why we never quote from a table: every estimate is customized to your project and budget after a free consultation and site visit.
We provide detailed, transparent estimates with no hidden fees.
Request a Free EstimateTimeline
Garage conversions often finish in 3–4 months; detached ADUs typically run 6–9 months including the 60-day permit review.
San Mateo permits
San Mateo's building department is established and consistent; older neighborhoods can add character and tree considerations on exterior work.
