Looking for cost of accessory dwelling unit in San Bernardino, CA? Call AccessoryDwellingUnit Solutions 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 involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

The total price for an ADU depends on several moving parts, including the square footage, your foundation type, and local labor rates. Choosing high-end finishes or complex site prep will naturally increase the budget, while standard layouts help keep things manageable. Exact pricing confirmed free on the call.

Frequently asked in San Bernardino

What are the disadvantages of ADUs in San Bernardino?

Potential drawbacks might include initial construction costs and potential impacts on your property's existing utilities. Some homeowners also consider the added responsibility of managing a rental unit if that's the intended use. The pros can help you weigh these factors for your specific San Bernardino situation.

How much does an ADU cost in California?

What are the rules for ADUs in California?

Is an ADU allowed in Maryland?

Our services are focused on California cities like San Bernardino. For ADU regulations in Maryland, you'll need to seek out information specific to that state and its local municipalities. Each area has its own set of rules for accessory dwelling units.

What are the rules for ADU in California?

California's ADU laws provide a framework, but cities like San Bernardino may have additional local ordinances. These can address aspects such as setbacks, height restrictions, and how ADUs integrate with existing infrastructure. The pros you speak with will be knowledgeable about these.

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, North San Bernardino, Delmann Heights, Crestline — and every surrounding area.