Accessory dwelling unit construction — 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.
Frequently asked in San Bernardino
Where can I find qualified accessory dwelling unit builders in San Bernardino?
What exactly is an accessory dwelling unit in San Bernardino?
Can I build an accessory dwelling unit in my backyard in San Bernardino?
What's involved in getting an ADU permit in San Bernardino?
Are there specific types of accessory dwelling unit homes allowed in San Bernardino?
How do I get an ADU quote for my San Bernardino property?
Is it difficult to find an ADU contractor near me 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, Reche Canyon, Mountain View — and every surrounding area.
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