Accessory dwelling unit services

Looking for accessory dwelling unit services 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

These services cover the entire lifecycle of building a backyard home, from initial property assessments and architectural design to navigating local zoning permits. You need this when you want to add living space to your property but don’t know where to start with city regulations or site feasibility. Professionals handle the paperwork, site planning, and technical requirements so you can focus on the final layout and how you plan to use the additional square footage on your lot.

Frequently asked in San Bernardino

What are the disadvantages of ADUs in San Bernardino?

Some potential downsides to ADUs include the initial construction costs and the impact on your existing property's yard. You should also consider how it might affect your property taxes and utility usage. Discussing these aspects with the pros who work in San Bernardino will give you a clearer picture.

How much does an ADU cost in California?

What are the rules for ADUs in California?

Is an ADU allowed in California?

Yes, ADUs are permitted across California, and state laws encourage their construction. San Bernardino, like most cities, has specific regulations in place to govern ADU development. These local rules ensure that ADUs integrate well into existing neighborhoods. The professionals can detail these requirements for your San Bernardino property.

What are the rules for ADUs in San Bernardino?

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, Verdemont, Highland, Palm Square — and every surrounding area.