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Newly built detached ADU behind a New England home in Greater Boston

Now legal by-right in Massachusetts

ADU Construction for Greater Boston Homes

Add a backyard cottage, an in-law suite, or a garage conversion. One licensed crew handles design, permits, framing, and wiring, start to finish.

Get a Free EstimateCall (781) 475-6392

ADU construction

More Room on the Lot You Already Own

An accessory dwelling unit, or ADU, is a second small home on your property. It might be a backyard cottage, a suite attached to the house, or a converted garage or basement. For families across Somerville and Greater Boston it is how you keep parents close, give an adult kid a start, or add steady rental income without moving.

A 2024 Massachusetts law made ADUs legal by-right in most single-family zones, so the door is finally open. The work still has to be done right, from zoning and utilities to a foundation or conversion and clean wiring. We handle the whole thing with one crew, so the finished unit is legal, comfortable, and built to last.

What ADU Construction Covers

Detached, attached, or converted, planned around your lot and the new state rules.

  • Detached backyard units

    A standalone cottage in the backyard, sized to your lot and matched to your main home, for rental income or family who wants their own front door.

  • In-law and attached suites

    A private suite added onto the house or built into the existing footprint, with its own entrance, kitchenette, and bathroom for parents or adult kids.

  • Garage and basement conversions

    Turning an underused garage, basement, or attic into a legal, comfortable dwelling, often the fastest and most affordable path to an ADU.

  • Design and zoning first

    We lay out a unit that fits your lot, setbacks, and the new state rules, then handle the drawings and paperwork so approval goes smoothly.

  • In-house electrical and utilities

    Separate metering where you want it, panel capacity, dedicated circuits, and clean tie-ins for water and heat, wired to code by our own licensed crew.

  • Permits and final inspection

    We pull the permit with your city or town, build to code, and coordinate the inspection, so the ADU is legal square footage you can rent or move into.

How it works

How an ADU Project Runs

From the first feasibility visit to a finished, inspected unit.

01

Free feasibility visit

We look at your lot, home, and goals, then tell you honestly what kind of ADU fits and what the new Massachusetts rules allow on your property.

02

Design, zoning, and fixed quote

You get a layout, a realistic budget, and a plan for permits and utilities up front, with no surprises once the work starts.

03

Permitted build, one crew

We pull the permit and handle foundation or conversion, framing, electrical, and finishes with one team, so the trades never wait on each other.

04

Inspection and handover

We pass inspection with you and hand over a finished, legal unit that is ready for family to move in or a tenant to rent.

ADU Construction FAQs

Common questions about the new law, cost, conversions, and permits.

In most cases, yes. A 2024 Massachusetts law now lets homeowners add one accessory dwelling unit by-right in single-family zones, without a special permit, subject to size and setback rules. Every lot is different, so we start with a free feasibility visit and confirm exactly what your city or town allows before you spend a dollar on design.
A detached ADU is a separate small building, like a backyard cottage. An attached suite shares a wall with your main house but has its own entrance. A conversion turns existing space, such as a garage, basement, or attic, into a legal dwelling. Conversions are usually the fastest and most affordable, while a detached unit gives the most privacy. We help you weigh the trade-offs for your lot and budget.
It depends heavily on the type. A garage or basement conversion is typically far less than a new detached unit, since the shell already exists. New construction costs more because of the foundation, utilities, and full exterior. We give you a fixed, itemized quote after the feasibility visit so you can compare the options honestly instead of guessing.
Yes. We manage the permit with your local building department, plan the water, heat, and electrical tie-ins, and our own licensed crew runs the wiring, panel, and any separate metering. Keeping it all under one roof is why an ADU with us moves start to finish without the usual subcontractor delays.
That is one of the main reasons homeowners build them. A legal, permitted ADU can be rented, which is why so many families in Somerville and Greater Boston are adding them. We build it to code as legal square footage so you can rent it or house family without gray-area risk. We hold MA HIC #217519 and CSL #122193 and are fully insured.

Thinking about an ADU?

Get a free feasibility visit from a licensed team that handles the design, the permits, the build, and the wiring.

Get Free EstimateCall (781) 475-6392
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