Accessory dwelling unit contractor

Looking for accessory dwelling unit contractor in San Bernardino, CA? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve San Bernardino 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.

About this service

A contractor manages the trades, materials, and timeline required to complete your backyard home. You need a contractor when you have design plans ready or need a lead to coordinate electricians, plumbers, and carpenters to get the structure move-in ready. They act as your project manager, ensuring that the work is finished on schedule and adheres to the building plans filed with your local municipality. Their role is essential for keeping the construction phase organized and safe.

Frequently asked in San Bernardino

What are the disadvantages of ADUs in San Bernardino?

Potential drawbacks include managing increased utility bills and the responsibility of maintaining an additional structure. You'll also want to consider potential impacts on your existing property's privacy and yard space. These are important factors to weigh.

How much does an ADU cost in California?

The cost of an ADU in California can vary wildly depending on its size, design complexity, and the quality of materials used. Site conditions, such as the need for extensive grading or complex utility hookups, also significantly impact the price. A personalized quote is essential.

What are the rules for ADUs in California?

California has state laws that encourage ADU development, but local governments like San Bernardino have their own ordinances. These rules often cover things like maximum lot coverage, height restrictions, and parking requirements. We can help you understand these.

Is an ADU allowed in California?

Absolutely, ADUs are permitted and actively encouraged throughout California. State legislation has aimed to simplify their creation, and most cities, including San Bernardino, have established guidelines for them. It's a way to address housing needs.

California has offered various financial assistance programs, including grants and loans, to support ADU construction. The availability and specifics of these programs can change over time. Exploring current incentives is a smart move for any homeowner.

What are the rules for ADUs in San Bernardino?

San Bernardino has specific ADU ordinances detailing requirements for setbacks, maximum unit size, and the number of ADUs permitted per lot. Design guidelines and parking provisions are also part of these local rules. We can help clarify these for your project.

Also serving nearby: Rialto · Fontana · Jurupa Valley · Rancho Cucamonga · Riverside

All cities in California →

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

Service area details

223,728residents

3,602per sq mile

8ZIP codes served

Serving all of San Bernardino — population 223,728; about 3,602 residents per square mile across 62.1 sq mi. ZIP codes covered include 92401, 92402, 92403, 92404, 92405, 92406, 92407, 92408.

Neighborhoods served in San Bernardino: Downtown San Bernardino, Muscoy, Meadowbrook, Palm City, Verdemont — and every surrounding area.