Looking for accessory dwelling unit companies in San Bernardino, CA? Call AccessoryDwellingUnit Direct 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 variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.

About this service

ADU companies provide end-to-end solutions, often integrating design, permitting, and construction under one roof. You need to engage a company when you want a streamlined experience and want to avoid the stress of hiring separate architects and builders. These companies handle the coordination of the entire project, ensuring that every phase of development transitions smoothly while keeping you updated on the progress and budget status of your new unit.

Frequently asked in San Bernardino

What are the disadvantages of ADUs in California?

Potential downsides to ADUs in California can include the initial investment for construction, possible impacts on existing utilities, and the need to comply with local zoning laws. You should also consider any changes to your property's outdoor living area. Being aware of these factors is essential for a smooth project.

How much does an ADU cost in San Bernardino?

The cost for an ADU in San Bernardino is highly dependent on factors like its size, the quality of finishes you choose, and any unique site conditions. The complexity of the foundation and the chosen building materials will also affect the overall price. A personalized quote will give you the most accurate picture.

What are the rules for ADUs in California?

California has state legislation that simplifies ADU construction by requiring local governments to approve qualifying projects. These laws typically cover aspects like minimum unit sizes, required distances from property lines, and potential development fees. Always confirm the latest regulations with the City of San Bernardino's planning department.

Is an ADU allowed in Maryland?

Our services are tailored for California cities, including San Bernardino. Maryland has its own distinct regulations regarding Accessory Dwelling Units. For information specific to Maryland, you'll need to seek out local resources or services operating within that state.

Can I build an ADU on my property in San Bernardino?

Generally, California state law sets guidelines for ADUs, and local ordinances in San Bernardino will further define what's permissible. Factors like lot size, existing structures, and utility connections are considered. A call to us will help clarify the possibilities for your specific location.

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, Loma Linda, Cucamonga, North San Bernardino — and every surrounding area.