Adu estimate — 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 estimate is a preliminary assessment of what your ADU project might cost before the final design is locked in. It helps you decide if your budget aligns with the size of the unit you want. Costs vary based on whether you choose a detached structure or a garage conversion. It is a starting point for planning. Exact pricing confirmed free on the call.
Frequently asked in San Bernardino
What are the rules for adding a modular accessory dwelling unit in San Bernardino?
How does building an accessory dwelling unit home work in San Bernardino?
What makes an accessory dwelling unit the 'best' option for a San Bernardino homeowner?
What's involved in accessory dwelling unit construction in San Bernardino?
Can I get an ADU that functions like an in-law suite in San Bernardino?
What's the process for getting the best ADU for my San Bernardino property?
What factors influence accessory dwelling unit construction cost 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: Highland Palms, Arrowhead Villas, North San Bernardino, South San Bernardino, Muscoy — and every surrounding area.
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