Accessory dwelling unit financing — 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
Financing an ADU involves finding a loan product that covers the construction of a secondary home on your existing property. Homeowners often look into cash-out refinances, home equity lines of credit, or specialized renovation loans to cover these costs. Factors like your current equity, credit score, and project scope determine which options you qualify for. It is best to explore your lending options before breaking ground. Exact pricing confirmed free on the call.
Frequently asked in San Mateo
What ADU services are available in San Mateo?
What is ADU housing and how is it used in San Mateo?
ADU housing in San Mateo refers to the construction of accessory dwelling units, which are secondary housing units on a single-family lot. These units are used for rental income, housing family members, or as guest quarters. They increase housing density and property value. We specialize in building these versatile units in San Mateo. Our goal is to provide functional and valuable additions to your home.
What kind of accessory dwelling unit services do you offer?
Are there 24-hour ADU services in San Mateo?
What does an ADU builder do in San Mateo?
How do I get an ADU estimate in San Mateo?
What's involved in ADU construction 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: Downtown San Mateo, Bay Meadows, Edgewater, Hillsdale, Shoreview — and every surrounding area.
Areas we serve
Browse by state, then city.
California (4)
All of California · Rialto · San Buenaventura (Ventura) · San Mateo · Vacaville