ADUs & Additions
Additions & Accessory Dwelling Units
More space. More value. Built to last.
What We Do
Expand Your Home, Expand Your Options
Whether you need a ground-floor addition, a second-story expansion, or a fully permitted ADU in your backyard, Monteiro Builders handles every phase — design coordination, permitting, foundation, framing, and finish.
ADUs are one of the smartest investments a Massachusetts homeowner can make. We build them to code, on budget, and with the same craftsmanship as the main house.
How It Works
Our Process
Design & Feasibility
We assess your lot, zoning, and goals to determine what's buildable and what delivers the best return.
Permitting
We handle all permit applications and coordinate with your municipality so you don't have to navigate the paperwork.
Construction
Foundation through finish — our crews work efficiently with daily site updates so you always know where the project stands.
Certificate of Occupancy
We see the project through final inspection and CO so your new space is fully legal, insurable, and ready to use.
Ready to Add Space & Value?
Free estimates. 100% financing available. Massachusetts licensed & insured.