Accessory dwelling unit contractor

Looking for accessory dwelling unit contractor in San Jose, CA? Call AccessoryDwellingUnit Services 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 involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

About this service

A contractor oversees the physical build, managing the subcontractors, materials, and daily construction progress. They are responsible for making sure the structure is built according to the approved plans and local safety standards. You need a contractor when you have your designs finalized and are ready for the actual building phase to begin. They act as the primary point of contact for all site activity.

Frequently asked in San Jose

What are the disadvantages of ADUs in San Jose?

Potential disadvantages include upfront construction costs and potential impacts on your existing yard space. You'll also need to consider how an ADU might affect your property taxes and utility bills. However, many homeowners find the long-term benefits outweigh these initial concerns. Let's discuss your specific situation.

How much does an ADU cost in California?

What are the rules for ADUs in California?

California has state laws encouraging ADUs, but local jurisdictions like San Jose have specific zoning ordinances and permit requirements. These often cover lot coverage, setbacks, and design standards to ensure ADUs fit within neighborhoods. Understanding these rules is key to a successful project. We can help clarify them for you.

Is an ADU allowed in my San Jose neighborhood?

The state of California has offered various grant programs to help offset ADU costs, though specific funding and eligibility can change. These grants often target specific income levels or types of ADUs. It's worth exploring current opportunities; we can point you in the right direction for information.

Can I build an ADU on my small lot in San Jose?

Yes, California state law has made it easier to build ADUs on smaller lots, and San Jose follows these guidelines. There are often minimum lot size requirements, but many standard-sized lots in areas like Naglee Park are suitable. A site assessment will determine feasibility for your property.

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

All cities in California →

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, Almaden Valley, Berryessa, Naglee Park, Santana Row — and every surrounding area.