Accessory dwelling unit cost — San Bernardino, CA
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
About this service
Total costs for an ADU vary based on the size of the unit, the complexity of the site, and the quality of materials you select for the kitchen and bathroom. Things like trenching for new sewer lines or upgrading your main electrical panel can also impact the bottom line. We provide an exact pricing confirmed free on the call.
Frequently asked in San Bernardino
What’s the general cost to build an ADU in San Bernardino?
How much does an ADU permit typically cost in San Bernardino?
What ADU services do you offer in San Bernardino?
Can I rent out my new ADU in San Bernardino?
Absolutely, renting out your new ADU in San Bernardino is a popular option for generating rental income. Many homeowners choose this route to help offset construction costs or supplement their earnings. Local ordinances often have specific guidelines for rental units, which the pros will help you understand. This can be a fantastic way to add value to your San Bernardino property.
What’s involved in building a backyard ADU in San Bernardino?
Building a backyard ADU in San Bernardino involves site preparation, foundation work, framing, and all the necessary utility connections. The pros will assess your yard for space, access, and any potential challenges. They'll ensure the new structure complements your existing home and yard. This is a great way to add functional living space without sacrificing much of your outdoor area.
What are the key ADU permit requirements in San Bernardino?
Key ADU permit requirements in San Bernardino include submitting detailed building plans, ensuring zoning compliance, and passing various inspections throughout construction. The pros will manage the submission and approval process for you. They're familiar with the specific San Bernardino building codes. This ensures your ADU is built legally and safely.
How can I finance my ADU construction in San Bernardino?
Financing your ADU construction in San Bernardino can be achieved through several avenues, including home equity loans, personal loans, or contractor financing options. Some homeowners also explore options like FHA loans for ADUs. We can’t offer financing ourselves, but the pros we work with can often discuss payment structures. They can help you understand the financial aspects of your San Bernardino ADU project.
Also serving nearby: Rialto · Fontana · Jurupa Valley · Rancho Cucamonga · Riverside
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
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, Verdemont, Muscoy, North San Bernardino, South San Bernardino — and every surrounding area.
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