Adu company — San Jose, CA | AccessoryDwellingUnit Services

Looking for adu company 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 professional company handles the heavy lifting, including architecture, engineering, permit submittals, and the actual construction labor. You need an experienced team when you want to ensure your unit is built to code, structurally sound, and completed on a predictable schedule. We act as your single point of contact, coordinating every trade and inspection so you aren't managing subcontractors yourself. We provide professional oversight from start to finish. Exact pricing confirmed free on the call.

Frequently asked in San Jose

What are the disadvantages of ADUs in San Jose?

How much does an ADU cost in California?

ADU costs in California, including San Jose, vary widely based on size, materials, and site conditions. Factors like foundation type, finishes, and permitting fees all play a role. We don't give exact figures here, but a quick call gets you a personalized quote. This helps you understand the investment for your specific project.

What are the rules for ADUs in California?

Is an ADU allowed in Maryland?

This question seems to be about Maryland, but we focus on San Jose, California. In San Jose, ADUs are generally permitted with specific zoning regulations. We can walk you through the local rules that apply to your San Jose property.

California has offered various grant and incentive programs for ADUs to encourage their development. Eligibility and availability can change, and specific requirements must be met. We can discuss current opportunities and how they might apply to your San Jose ADU project during your call. This helps you explore all financial avenues.

How can I find ADU builders in San Jose?

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: Cambrian, Willow Glen, Almaden Valley, Downtown San Jose, Rose Garden — and every surrounding area.