Accessory dwelling unit contractor

Looking for accessory dwelling unit contractor in San Jose, CA? Call AccessoryDwellingUnit Experts 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 major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

A dedicated contractor manages the heavy lifting of your ADU project. This involves hiring skilled tradespeople, ordering materials, and ensuring that every phase of construction passes municipal inspections. You need a contractor when you want a single point of contact to oversee the transition from a vacant backyard area to a fully finished, livable home. They bridge the gap between initial architectural designs and the final move-in date for your new space.

Frequently asked in San Jose

What are the disadvantages of ADUs?

While ADUs offer many benefits, potential downsides include the upfront construction costs and the time it takes to get permits approved by the city. You'll also need to consider how it might affect your current property's privacy or yard space. It's important to weigh these factors before committing to a project in San Jose.

How much does an ADU cost in California?

The cost of an ADU in California can vary widely based on size, materials, and site-specific conditions in San Jose. Factors like foundation type, finishes, and whether you need to upgrade utilities all play a role. Getting a personalized quote from a local pro is the best way to understand the investment for your specific situation.

What are the rules for ADUs in California?

California has statewide ADU laws designed to make them easier to build, but local jurisdictions like San Jose often have their own specific requirements for setbacks, height, and parking. Understanding these rules is crucial for a smooth project. A local expert can help you navigate these regulations.

Is ADU allowed in Maryland?

This service focuses on California. If you're interested in building an ADU in Maryland, you'll need to research the specific local ordinances for that state and county. Rules vary significantly by location, so checking with the local planning department is the first step.

What are the rules for ADU in California?

California has made significant efforts to streamline ADU development with statewide standards, but cities like San Jose still have local ordinances. These can cover things like maximum lot coverage, design standards, and utility connections. It's essential to consult with someone familiar with both state and local regulations.

While there have been grant programs in California to incentivize ADU construction, these can change and often have specific eligibility requirements, especially for junior ADUs. It's best to inquire about current programs directly with local authorities or experienced 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: Downtown San Jose, Willow Glen, Japantown, Almaden Valley, Rose Garden — and every surrounding area.