ADU Construction Services in Massachusetts
Unlock the potential of your property with a custom Accessory Dwelling Unit (ADU) from New England Painting & Contracting, your trusted, local experts for complete ADU design and construction across Massachusetts.
What is an ADU?
An Accessory Dwelling Unit (ADU) is a fully self-contained living space built on the same lot as your main home. ADUs can be:
- Internal: Converted basements or attics
- Attached: Additions connected to your main house
- Detached: Standalone structures like backyard cottages or garage conversions
Each ADU includes its own kitchen, bathroom, living space, and private entrance—perfect for family, guests, or long-term renters.
Why Build an ADU in Massachusetts?
With Massachusetts’ new statewide law, ADUs up to 900 square feet (or 50% of your main home’s size, whichever is less) are now allowed by right in all single-family zoning districts. That means:
- No special zoning approvals needed if your ADU meets state law
- No owner-occupancy requirement—rent to anyone, not just family
- No excessive local restrictions—towns can’t impose stricter rules than the state law
- Flexible use: Rent out your ADU for long-term income, create a home for aging relatives, or provide independent living for young adults.
Curious About Building an ADU?
Scroll down to find answers to the most common questions Massachusetts homeowners ask about ADU construction.
Our Complete ADU Design & Construction Process
At New England Painting & Contracting, we manage every phase of your ADU project—from initial concept to move-in ready completion:
- Site Assessment & Consultation: We evaluate your property, discuss your vision, and explain all options.
- Custom Design: Our team creates a tailored ADU design that maximizes space, comfort, and value.
- Permitting: We handle all permitting with your local building department, ensuring compliance with state and local requirements.
- Full-Service Construction: Our licensed and insured crew manages every step:
- Site preparation and demolition
- Foundation and framing
- Electrical, plumbing, and mechanicals
- Interior and exterior finishes
- Inspections and final walkthrough
- Move-In Ready: We deliver a finished ADU, ready for occupancy and built to the highest standards.
Why Choose New England Painting & Contracting for Your ADU Project
Attention to Detail
What distinguishes us from other remodeling contractors in Greater Boston area is our meticulous attention to detail. We recognize that even the smallest details can have a substantial impact on the final result of your project.
Customer Satisfaction
Ensuring your absolute satisfaction is our topmost priority. We aim to surpass your anticipations by presenting a beautifully finished remodeling project, marked by superior craftsmanship and remarkable customer service.
Personalized Service
Owner, Larry Gamst and his dedicated team will collaborate closely with you to comprehend your dream and deliver tailored solutions that align with your unique needs.
- Licensed & Insured: Fully accredited and licensed in Massachusetts, including CSL and HIC licenses.
- Over 30 Years of Experience: Trusted by homeowners throughout Eastern Massachusetts and beyond.
- 5-Star Reviews: Our clients consistently praise our professionalism, craftsmanship, and responsiveness.
- Fast Response & Free Estimates: Quick, clear communication from your first call to final inspection.
- One-Stop Service: We handle every aspect—design, permitting, construction, and finishing—so you don’t have to juggle multiple contractors.
- Guaranteed Quality: We stand behind our work with strong warranties and a commitment to your satisfaction.
Frequently Asked Questions About ADU Construction in Massachusetts
What is an ADU?
An Accessory Dwelling Unit (ADU) is a self-contained residential unit located on the same lot as a main home. It can be internal (such as a basement apartment), attached to the main house, or detached as a separate structure.
How large can my ADU be in Massachusetts?
ADUs can be up to 900 square feet or 50% of the main home’s gross floor area, whichever is smaller. The minimum size is 350 square feet.
Do I need special approval to build an ADU?
No. In single-family zoning districts, you can build an ADU by right, as long as your project meets state law and local building codes. You do not need special or discretionary approval from the local zoning board.
Can I build a detached ADU, or does it have to be part of my house?
You can build an internal, attached, or detached ADU, provided your property meets the size and zoning requirements.
Are there owner-occupancy requirements?
No. Massachusetts law does not require the property owner to live in either the main home or the ADU.
Who can live in my ADU?
There are no restrictions on who can live in an ADU. Occupancy is determined by building, health, and fire codes.
Can I rent out my ADU?
Yes, you can rent out your ADU for long-term housing. However, short-term rentals (like Airbnb) may be restricted depending on your municipality. State law allows towns to prohibit short-term rentals in ADUs only if they also prohibit them in single-family homes generally.
What is the process for getting a permit?
You must submit an application to your local building department. If your ADU meets state and local requirements, the permit cannot be denied except for reasonable conditions or site plan review.
How long does it take to design and build an ADU?
The timeline can vary:
- Feasibility & Design: Up to 3 months
- Permitting: Up to 3 months
- Construction: 6–12 months, depending on the type and complexity of the project.
Do I need to hire a licensed contractor?
Generally, yes. Massachusetts law requires a licensed general contractor for ADU construction. Homeowners of single-family homes may supervise their own project but must file a Homeowner Exemption Form.
Are there parking requirements?
Usually, one additional off-street parking space is required, unless your property is within half a mile of public transit, in which case no extra parking is required.
What building codes apply to ADUs?
ADUs must comply with all state and local building codes, including:
- Fire separation between units
- Proper ventilation and natural light
- Minimum room sizes and ceiling heights
- Two means of egress
- Interconnected smoke and carbon monoxide detectors
- Compliance with energy codes.
Can I build an ADU if my property uses a septic system?
Local zoning ordinances cannot enforce stricter septic requirements than state law. However, your ADU must comply with Title V septic system requirements if applicable.
How do I start my ADU project?
Start by researching local zoning, consulting with an experienced ADU contractor, and preparing your design and permit application. Working with a professional can help ensure your project meets all requirements and moves smoothly through the approval and construction process.
ADU Construction Service Area
New England Painting & Contracting proudly serves homeowners throughout Massachusetts with expert ADU design and construction services. While we work across the entire Commonwealth, we specialize in serving the Greater Boston communities where we've built deep relationships and extensive local expertise over three decades. Our team has particular specialization in Melrose ADU construction, where we understand the unique opportunities presented by the town's proximity to Oak Grove MBTA station and strong rental market demanding $2,200-$3,500 monthly rates.
We also bring extensive experience to Wakefield ADU projects, leveraging the community's lakeside charm and environmental consciousness to create ADUs that maximize both scenic appeal and investment potential. Additionally, our Stoneham ADU construction services help homeowners in this well-positioned community capitalize on strong property values and diverse architectural styles. Whether you're located in these core communities or anywhere else across Massachusetts, our licensed and insured team delivers the same commitment to quality craftsmanship, regulatory compliance, and customer satisfaction that has earned us over 30 years of trust throughout Eastern Massachusetts.
Have more questions?
Call us at (978) 435-5800 or contact us online for expert guidance on your ADU project!
