Best accessory dwelling unit — San Mateo, CA
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.
About this service
The right ADU for your property is one that balances your functional needs with the existing architecture of your main home. A great unit maximizes natural light, offers a smart floor plan, and stays within your budget. Whether you need a home office, a rental space, or housing for family, the best unit is built to last and integrates well with your yard. Exact pricing confirmed free on the call.
Frequently asked in San Mateo
What are the benefits of homes with in-law suites in San Mateo?
Homes with in-law suites in San Mateo offer superb multi-generational living. They provide private, comfortable spaces for family members. These suites can also generate rental income, boosting property value. Consult with us to explore these benefits for your San Mateo home.
What accessory dwelling unit services are available in San Mateo?
What is the typical ADU company like in San Mateo?
How do I get an ADU permit in San Mateo?
What is the estimated accessory dwelling unit construction cost in San Mateo?
Are there options for emergency ADU services in San Mateo?
What are accessory dwelling units adus in San Mateo?
Also serving nearby: Hayward · Daly City · Oakland · Sunnyvale · Fremont
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of San Mateo — population 101,327; about 8,350 residents per square mile across 12.1 sq mi. ZIP codes covered include 94401, 94402, 94403, 94404, 94497.
Neighborhoods served in San Mateo: Bay Meadows, Burlingame Terrace, Crown Terrace, East San Mateo, Howard Park — and every surrounding area.
Areas we serve
Browse by state, then city.
California (4)
All of California · Rialto · San Buenaventura (Ventura) · San Mateo · Vacaville