Thinking of building an ADU? You’re probably curious about cost, timing and square footage. Below, we dive into these three popular topics to give you clear answers to these commonly asked questions.
How much does an ADU cost?
Villa’s prices start as low as $199,000 for a one-bedroom, one-bathroom home, all-inclusive. Looking for more space? We have seven two- and three-bedroom options ranging from $209,000 to $269,000. Those prices include everything from site prep, to permits to final inspection, as well as the fully installed unit with fixtures and appliances. The foundation, trenching, and utility connections are all included too.
Following installation, other fees to keep in mind are home insurance and property taxes. The good news is, your primary home will not 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. The base value of your existing primary dwelling will stay the same.
What’s the biggest ADU I can build?
Each municipality in California has different regulations that determine maximum square footage. For example, Santa Rosa allows a maximum size of 800 square feet for one-bedroom ADUs, 1,000 square feet for two-bedroom ADUs, and 1,200 square feet for three-bedroom ADUs, as long as the unit is smaller than 40 percent of the lot. In Napa, the maximum-size ADU you can build is two bedrooms at 1,200 square feet. We’ve compiled regulations for many cities in California here, or you can visit the California Department of Housing and Community Development website to find out the specifics for your neighborhood.
Many types of properties can accommodate a detached ADU, and our floor plan options are flexible to fit a range of backyards.
How long does it take to build an ADU?
Because Villa’s ADUs are built offsite and finished onsite, the installation phase can be as short as 48 hours or up to three or four weeks. Prefab construction has the advantage of being significantly faster and more efficient to build than other construction types. Also note that prefab circumvents weather delays during construction, and limits the mess and noise typically associated with home construction, since the bulk of the build is done offsite.
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Ready to get building? Start with this short property assessment