Affordable accessory dwelling unit

Looking for affordable accessory dwelling unit in San Bernardino, CA? Call AccessoryDwellingUnit Solutions 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 several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

Building an affordable unit often comes down to choosing efficient designs and pre-planned layouts rather than full custom builds. By simplifying utility connections and minimizing complex excavation, you can keep your project within a reasonable budget. While we aim to make the process accessible, the final bill depends on your specific site conditions. Exact pricing confirmed free on the call.

Frequently asked in San Bernardino

What are the disadvantages of ADUs in San Bernardino?

The primary disadvantages can be the initial investment and the permitting process, which can sometimes be lengthy. You also need to consider potential impacts on your existing utilities and lot coverage. Thorough planning with experienced professionals can mitigate these concerns. We can help you find those experts.

How much does an ADU cost in California?

The cost of an ADU in California, including in San Bernardino, is highly variable. It depends on factors like the size of the unit, the quality of materials used, and site preparation needs. Complex plumbing or electrical work can also increase costs. A personalized quote is the most reliable way to determine your specific project's expense.

What are the rules for ADUs in California?

California has statewide laws that streamline ADU development, but San Bernardino has its own local ordinances that must be followed. These rules often dictate setbacks, maximum size, and parking requirements. Understanding these specific regulations is vital for a smooth build. We can help you connect with pros who know these details.

Is an ADU allowed in Maryland?

California has had grant programs aimed at making ADUs more accessible, sometimes offering substantial financial assistance. Eligibility for these grants typically depends on income levels and other specific criteria. It's important to research current grant availability for your San Bernardino project. We can point you to resources for this information.

What are the typical ADU sizes in San Bernardino?

ADU sizes in San Bernardino, as with much of California, can vary but are often designed to be efficient. Common sizes range from studio units to two-bedroom configurations, typically within the maximum square footage allowed by local ordinances. The size will ultimately depend on your property's constraints and your needs. We can help you explore options.

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, Highland, Loma Linda, Rialto — and every surrounding area.