Adu unit — 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
An ADU unit is simply a secondary dwelling located on the same lot as a primary residence. You might look into an ADU if you need more space for a home office, a gym, or housing for extended family. Exact pricing confirmed free on the call.
Frequently asked in San Bernardino
What are the rules for building a modular ADU in San Bernardino?
San Bernardino has specific guidelines for modular accessory dwelling units. These units are built off-site and then assembled on your property. The pros we work with understand these regulations thoroughly. They can ensure your modular ADU meets all local codes and requirements. This often streamlines the building process significantly. Talk to us to learn more.
How do I find ADU services near me in San Bernardino?
What’s involved in building a home with a mother-in-law suite in San Bernardino?
Are there affordable options for accessory dwelling units in San Bernardino?
What are the key considerations for building homes with in-law suites?
What's the general accessory dwelling unit cost in San Bernardino?
Can I get a prefab ADU built in San Bernardino?
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, Muscoy, University District, North San Bernardino, South San Bernardino — and every surrounding area.
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