Accessory Dwelling Unit
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Custom ADUs Built for Island Living
Adding an accessory dwelling unit is one of the most valuable improvements you can make to your property. Peart Professional Services designs and builds ADUs across Martha’s Vineyard — detached cottages, garage and basement conversions, and attached in-law suites — delivering complete, code-compliant living spaces from the ground up.
From excavation and foundation through framing, utilities, and final finish, we manage the entire build with one trusted team, so you’re never coordinating between multiple contractors.
More Space. More Value. More Options.
An ADU is a fully self-contained living space with its own kitchen, bathroom, and sleeping area, built on the same lot as your main home. For island property owners, that flexibility matters — housing for family, a place for year-round staff, guest accommodations, a home office, or long-term rental income.
Massachusetts law now allows one ADU of up to 900 square feet by right on most single-family lots, which has made these projects far more accessible for homeowners. Our team handles the practical side: what your lot can support, how it connects to your existing systems, and what the finished space will actually cost to build.
Our ADU Construction Services
Our ADU services cover every phase of the project — from evaluating your lot to handing over a finished, move-in-ready unit. Whether you’re converting existing space or building new, we handle the details that keep the project on schedule and up to code.
- Detached ADU Construction – Freestanding backyard cottages and guest houses built from the foundation up.
- Garage & Outbuilding Conversions – Turning existing structures into fully permitted, self-contained living space.
- Basement & Attic Conversions – Interior ADUs created within your existing home, with separate entrances and egress.
- Attached ADUs & Additions – In-law suites and additions built onto the main home with independent access.
- Site Work & Foundations – Excavation, grading, and foundation work sized correctly for the structure.
ADU Projects for Homeowners and Property Owners
We build accessory dwelling units for year-round residents, seasonal homeowners, and property owners across Martha’s Vineyard. Every project starts with an honest look at what your lot allows — setbacks, septic capacity, utility access, and existing site conditions all shape what’s realistic before a single design decision is made.
Our team works within local bylaws and permitting requirements, which vary from town to town on the island, and we keep disruption to your main residence to a minimum throughout the build.
How We Build Your ADU
From the first site visit to the final walkthrough, our process keeps the project clear, predictable, and professionally managed at every stage.
Site Visit & Feasibility Review
We assess your lot, existing systems, and what your property can realistically support.
Design, Permitting & Clear Quote
Plans, approvals, and straightforward pricing before any work begins.
Site Work & Construction
Excavation, foundation, framing, utilities, and build-out handled by one team.
Final Walkthrough & Handover
Inspections, cleanup, and a final review with you.
Why Our ADU Work Stands Apart
We bring construction experience, site knowledge, and clear communication to a project type where all three matter.
One Team, Start to Finish
Excavation, septic, foundations, and finish work under a single company.
Experienced & Fully Insured
A qualified team equipped for full-scope residential construction.
Local Permitting Knowledge
We work within island bylaws, septic requirements, and inspection standards.
Clear & Honest Pricing
Upfront estimates and open communication from first quote to final invoice.
Built for Martha's Vineyard Properties
Peart Professional Services builds accessory dwelling units throughout Martha’s Vineyard, with an understanding of island soil conditions, septic limitations, coastal weather exposure, and the local permitting process. Every unit is built to meet code and to hold up to island conditions for the long term.
Get a Free ADU Consultation!
Thinking about adding an ADU to your property? Let’s find out what your lot can support.