An ADU is a small, secondary dwelling located on the same property as a primary home. Often called in law suites or granny flats, ADUs can be attached—such as converted basements, garages, or additions—or detached, like standalone tiny homes. These dwellings offer adaptable space for guests, rental opportunities, home offices, art or fitness studios, or comfortable living arrangements for aging family members.

Homeowners with eligible residential property can add an ADU as long as they meet local zoning and state building codes. Massachusetts identifies ADUs as suitable for uses such as guest housing, rental units, studios, and other flexible living spaces. 

The Massachusetts Affordable Homes Act and updated statewide guidance have made ADUs a widely supported option for homeowners in the Berkshires. State resources highlight that ADUs help homeowners make the most of their property while adding long term value. Visit mass.gov for more on statewide regulations.

Locally, the Berkshire Regional Planning Commission has moved to update bylaws to reflect a broader right to build ADUs within single family zoning districts—creating more clarity and opportunity for residents interested in adding this type of space.

ADUs take 4–10 months to build once construction begins, with timing varying based on design and site conditions. Because each ADU is fully customized, costs depend on factors such as size, materials, complexity, and location. At Xanadu Build, we provide accurate estimates after learning more about your goals and the needs of your property.

We provide full ADU design and build services, including permitting, placement strategy, construction, and healthy building options like nontoxic materials and high-performance air systems. With decades of carpentry and building experience, our team brings care and craftsmanship to every project.

If you’re exploring an ADU for your property this year, we’d be happy to schedule a site visit and help you imagine what’s possible. Call us at 413-822-9395 or email info@xanadubuild.com.