Your Home. Your Future. Your ADU.
Mass ADU is a Massachusetts-based Accessory Dwelling Unit (ADU) company specializing in ADU design, permitting, and construction throughout Massachusetts. We help homeowners build detached ADUs, attached ADUs, garage conversion ADUs, prefab ADUs, backyard cottages, in-law apartments, and multigenerational living spaces designed to support affordable housing and long-term property value.
What We Offer
Detached ADUs
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Create a standalone living space on your property for family, guests, rental opportunities, or multigenerational living.
Attached ADUs
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Expand your existing home with a connected living space designed to blend seamlessly with your current structure.
ADU Conversions
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Transform existing spaces such as basements, garages, or underutilized areas into functional living space.
Prefab ADUs
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Factory-built accessory dwelling units constructed off-site and placed on your property to create flexible living space for family, guests, or rental opportunities.
In addition to ADU construction, we also provide exterior home services throughout Massachusetts. From siding and roofing to decks, additions, and exterior renovations, our team helps homeowners improve and enhance their properties from planning through completion.
“This group is very easy to work with. Leah spent a lot of time with us reviewing the process and moving forward to the permitting. We look forward to the construction phase.”
- Andover Client