AccessoryDwellingUnitPros ES 📞 (815) 860-2798

Local adu — San Jose, CA

Looking for local adu in San Jose, CA? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve San Jose and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

Frequently asked in San Jose

What does an ADU contractor in San Jose do?
Where can I find accessory dwelling unit builders near me in San Jose?
What are the main types of accessory dwelling units?

Accessory dwelling units (ADUs) generally fall into three main categories: attached ADUs, which are integrated into an existing home; detached ADUs, which are standalone structures on the property; and converted ADUs, such as transforming a garage or basement into habitable space. The choice often depends on lot size, zoning regulations in San Jose, and homeowner preference for privacy and integration. We can help you determine the best type for your property. This ensures it meets your needs and local codes.

What is involved in getting an ADU permit in San Jose?

Obtaining an ADU permit in San Jose requires submitting detailed architectural and engineering plans to the city's planning and building departments for review. These plans must demonstrate compliance with all local zoning ordinances and state ADU laws, covering aspects like setbacks, height, and lot coverage. You'll also need to address utility connections and potentially pay applicable development fees. We can guide you through this complex application process. Our aim is to make it as straightforward as possible.

How much does it generally cost to build an ADU in San Jose?
What are the steps for ADU construction in San Jose?

ADU construction in San Jose begins with initial design and permitting, followed by site preparation and foundation laying. Next comes the framing, installation of utilities (electrical, plumbing, HVAC), exterior finishing, and finally, interior build-out and final inspections. Each stage must comply with San Jose Municipal Code and state ADU regulations. We ensure all phases are managed professionally. This guarantees your ADU is built to the highest standards.

Can I get an ADU estimate for my property?

Yes, you can get an ADU estimate tailored to your specific property in San Jose. This involves a professional assessment of your lot, existing structures, and your desired ADU design. Factors like topography, soil conditions, and the need for utility upgrades are considered. We provide complimentary, no-obligation estimates after a thorough evaluation. This ensures the quote is accurate and reflects your unique project requirements.

Also serving nearby: Burbank · Santa Clara · Sunnyvale · Fremont · Hayward

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

969,655residents
5,449per sq mile
8ZIP codes served

Serving all of San Jose — population 969,655; about 5,449 residents per square mile across 177.9 sq mi. ZIP codes covered include 95025, 95101, 95103, 95106, 95108, 95109, 95110, 95111.

Neighborhoods served in San Jose: Willow Glen, Rose Garden, Almaden Valley, Evergreen, Downtown San Jose — and every surrounding area.

Areas we serve

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