Adu unit — Boston, MA

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

An ADU unit is simply another term for a secondary dwelling unit located on the same lot as a primary residence. Whether it is a conversion of a garage or a brand-new structure, the unit serves as an independent living space with its own kitchen and bath. Homeowners often add these units to increase property value or house guests comfortably. Exact pricing confirmed free on the call.

Frequently asked in Boston

Also serving nearby: Quincy · Cambridge · Lynn · Newton · Brockton

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

Serving all of Boston — population 653,833; about 13,525 residents per square mile across 48.3 sq mi. ZIP codes covered include 02108, 02109, 02110, 02111, 02112, 02113, 02114, 02115.

Neighborhoods served in Boston: Back Bay, South End, Beacon Hill, North End, Allston — and every surrounding area.