Detached accessory dwelling 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
A detached ADU is a standalone building separate from your main house, like a cottage or a converted garage. You choose this style if you want maximum privacy for your tenants or family members. Because it requires its own foundation and utility lines, it is a significant construction project. Exact pricing confirmed free on the call.
Frequently asked in San Bernardino
What's the deal with accessory dwelling units in San Bernardino?
Accessory dwelling units, or ADUs, are secondary housing units on a single-family lot in San Bernardino. These can be attached or detached, offering flexible living options. Think of them as a smart way to increase housing availability or create rental income. Our local pros understand the specific regulations here.
How much does an ADU typically cost in San Bernardino?
The cost of an ADU in San Bernardino really depends on its size, design, and features. Factors like foundation type and utility connections play a big role. To get an accurate idea for your specific project, it's best to get a personalized quote. We can arrange that for you.
What does 'accessory dwelling unit' actually mean for my property?
Is building a backyard ADU a good idea in San Bernardino?
Building a backyard ADU in San Bernardino can be a fantastic idea, especially with our city's density. It provides valuable extra living space without requiring a major move. You can gain rental income or accommodate guests and family. Let's explore how it fits your yard.
What are the steps to get an ADU permit in San Bernardino?
Getting an ADU permit in San Bernardino involves submitting plans to the city for review. These plans must comply with local zoning and building codes. The process ensures your ADU is safe and legal. Pros we work with are familiar with these requirements.
What goes into the construction cost of an ADU?
The construction cost for an ADU in San Bernardino covers materials, labor, and site preparation. Foundation work, framing, roofing, and interior finishes all contribute. Utility hookups and any necessary grading also factor in. We can help you get a clear breakdown.
How do I find the best ADU options for my San Bernardino home?
Finding the best ADU for your San Bernardino home starts with assessing your needs and property. Consider the size, style, and intended use of the unit. Talking to experienced local builders is key to understanding what's feasible and most beneficial. We can set that up.
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, Crestline, Muscoy, Del Rosa, Verdemont — and every surrounding area.
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