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 or keep family close with independence.
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
Typical Bay Area ranges, not a quote. ADU cost is driven most by type (conversion vs. detached), size, site access, and utility connections. We give you a fixed proposal after a free feasibility visit.
Timeline
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.
