How Much Does It Cost to Build an ADU?

Cost is understandably a top consideration when you’re trying to decide whether to add an ADU (accessory dwelling unit) to your yard. Our prices range from $199,000 for a 440-square-foot one-bedroom home to $269,000 for a 1,200-square-foot three bedroom home, both with standard features. We have 10 models to choose from, all with customization options. See our complete price list here, and check out all our units with floor plans here.

What’s included in the price of our ADUs

When you build with Villa, everything you need for a standard project is included in the price of the unit: site evaluation and prep, permit creation and submission, the foundation, trenching, the fully completed unit with fixtures and appliances, delivery, utility connections, and the final inspection. Extra work and upgrades are additional charges.

Many other ADU builders charge extra for everything beyond the unit itself, and those costs can really add up.

Don’t forget property taxes and insurance


The good news is that in California, an ADU does not require your primary home’s value to be reassessed—ADUs do not trigger Prop 13. Your property tax will be recalculated based on a blended assessment, which should increase your annual property tax only by about 1 percent of the value of the ADU project. The base value of your existing primary dwelling will stay the same.

As for property insurance, whether you get an extension on your primary home’s insurance policy or a separate policy for your ADU, make sure to include the added cost in your calculations.

Want to learn the ADU price for your specific site? Start by clicking the button below to get a free, no-commitment property assessment.

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