Accessory Dwelling Units (ADUs) built by Greater Boston remodeling experts
Three Sons Window & More is proud to introduce Accessory Dwelling Unit construction for homeowners across Greater Boston. Whether you need space for aging parents, a private suite for adult children, a home office retreat, or a long-term rental opportunity, an ADU can expand your home’s footprint and value — without leaving the property you already love.
As a family-owned remodeling company with more than 40 years of construction experience, we oversee every phase of your ADU project start to finish. We are responsive to our customers’ needs because we realize that adding living space to your home is a big undertaking — and your satisfaction is always our goal.
I am extremely pleased with the window replacement work completed by Jeff and Jon. From start to finish, they were professional, knowledgeable, and highly attentive to detail.
I had wainscoating added to my entry hall, beadboard added to my bathroom, new sink installed which included plumbing, and painting done. James and Rick were great… In and out in 3 days. Everything was done without a hitch.
Three Sons windows & More put in 4 sets of windows in our home did an excellent job. Cleaned up after themselves. The price was the best we found anywhere. We highly recommend them. 5stars without a doubt.
Jon did a fabulous job installing my sliding patio door. He was very professional and every detail was perfect! I would absolutely recommend this company!
From new windows to complete remodels, Three Sons proudly does it all.
Three Sons is dedicated to making your renovation plans a reality by providing you with comprehensive construction services at a reasonable price.
Expand your home's footprint and value with an ADU built by industry experts
An Accessory Dwelling Unit — sometimes called an in-law suite, carriage house, or backyard cottage — is a self-contained living space on your property. ADUs can be attached to your existing home, built above a garage, or designed as a freestanding structure, depending on your lot, lifestyle, and local zoning.
Three Sons guides homeowners through planning, design coordination, permitting support, and construction with the same comprehensive approach we bring to windows, doors, siding, roofing, decks, and full remodels. Every project is unique, and we help you select quality materials and finishes that match both your home and your long-term goals.
ADU questions, answered
An Accessory Dwelling Unit is a secondary living space on the same lot as your primary home. It typically includes its own sleeping area, bathroom, and kitchen or kitchenette, giving occupants independence while remaining close to family.
Common goals include multigenerational living, caregiver housing, flexible guest space, a private office or studio, and creating a rental unit that can help offset housing costs — all while increasing long-term property value.
Yes. We manage remodeling and construction with a start-to-finish approach. That includes planning conversations, material guidance, construction, and coordination with other professionals as your project requires. We keep you informed so the process feels clear and manageable.
Most ADUs require local permits and must meet municipal zoning rules for size, setbacks, parking, and utilities. Requirements vary by town. Three Sons helps homeowners navigate the practical construction side of the process and works within the approvals required for your community.
Start with a free estimate and consultation. We’ll discuss your goals, property considerations, timeline expectations, and next steps. From there, we outline a clear path forward tailored to your home — the same responsive partnership families across Greater Boston have trusted for decades.
A complete ADU build — managed by one trusted local team
From the first conversation through final walkthrough, Three Sons stays involved. We help you understand site constraints, coordinate with design professionals when needed, and keep your project organized so you are never left guessing about next steps.
Homeowners choose Three Sons because we are fully licensed and insured, committed to craftsmanship, and focused on communication. Adding an ADU is one of the most meaningful investments you can make in your property — and we treat it with the care it deserves.
Ready to get started on your next home improvement project?
At Three Sons, we make it as easy as possible for customers to get a free, transparent and honest estimate on their home improvement projects. Contact our team today!
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