Adu services — San Bernardino, CA | AccessoryDwellingUnit Pros

Looking for adu 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

ADU services simplify the complex process of turning unused yard space into a functional, independent living unit. This involves architectural drafting, structural engineering, and managing municipal building departments to secure necessary approvals. You should look for these services when you are ready to expand your home’s footprint for rental income, guest accommodations, or multi-generational living. Engaging experts ensures the project stays compliant with state codes while meeting your specific design goals for a secondary dwelling.

Frequently asked in San Bernardino

What are the disadvantages of ADUs in California?

Potential drawbacks include the initial investment and the time it takes to get permits and complete construction. You might also encounter neighborhood feedback or challenges with existing utility connections. However, for many San Bernardino homeowners, the long-term benefits of increased property value and rental income are significant. A free discussion can help you weigh these factors.

How much does an ADU cost in California?

The cost of an ADU in California is highly variable, influenced by factors like the size of the unit, the quality of materials used, and the specific site conditions in San Bernardino. Complex foundation work, extensive plumbing, or electrical upgrades will increase the overall expense. Getting a detailed, no-obligation quote is the best way to understand your project's cost.

What are the rules for ADUs in California?

California has state laws that set a baseline for ADU development, aiming to simplify the process. These laws typically address minimum unit sizes and limitations on impact fees. San Bernardino has its own specific ordinances that must be followed, covering things like setbacks and parking. A professional can clarify these for your property.

Is an ADU allowed in Maryland?

What are the rules for ADU in California?

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, Crestline, Loma Linda — and every surrounding area.