Tell us your vision
Share how you want to use the space, what matters most, and what you hope to achieve.
More room for what matters
A little more space.
A lot more possibility.
Beautifully considered accessory dwelling units that make your property work harder — and your life feel roomier.
Designed for real life.
Made for your property.
Made for your property.
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The Mass ADU difference
Small footprint.
Big potential.
Your property has more possibilities than you think.
At Mass ADU Realty, we believe an accessory dwelling unit should feel like a natural extension of your home — considered in every detail, comfortable to live in, and designed around the way you want to use your space.
From a private place for family to a peaceful studio or a potential rental, we help you explore smart, modern options for making more of the space you have.
Get to know us ↗01One property.
More possibilities.
More possibilities.
02Design with
purpose.
purpose.
03A plan built
around you.
around you.
Architecture that feels at home.01 / ADU inspiration
Our point of view
Good design is about more than square footage.
It is about how a room welcomes the morning light. Where everything belongs. How a smaller space can feel open, private, and entirely your own.
We focus on practical layouts, considered details, and design options that balance everyday comfort with the realities of your site and goals.
01
Purposeful layouts
Spaces designed to live beautifully.
02
Modern character
Clean lines, warm materials, timeless appeal.
03
Guided decisions
A clearer path from idea to next steps.
A clearer path forward
From first idea
to a thoughtful plan.
Every property and project is different. We help you take the next steps with a clearer understanding of your goals, options, and site considerations.
Explore your options
Review possible layouts and styles while considering your property's needs and limitations.
Plan your next steps
Identify the questions to resolve around site suitability, local rules, utilities, and project scope.
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The right space doesn't have to be bigger. It has to work better.
Thoughtful ADU living, designed around what matters to you.
Your project starts here
Let's make room
for possibility.
Tell us what you're imagining. Whether you have a clear plan or are just beginning to explore, let's start with a conversation.
Call our team978.821.0233
Based inMassachusetts
01A smaller home.
More room to grow.
More room to grow.
The basics
What is an ADU?
An Accessory Dwelling Unit is a self-contained home on the same lot as a primary residence.
It may be a detached backyard cottage, an addition to the main house, or a converted space such as a basement or garage. A qualifying ADU includes living, cooking and bathroom facilities, plus a separate entrance.
↗DetachedA separate backyard home
⌂AttachedAn addition connected to the house
▤ConvertedA suitable existing interior space
Massachusetts overview
What is the ADU law?
Massachusetts updated its state law to make it easier to create certain accessory dwelling units.
Under the Affordable Homes Act, a qualifying single ADU can generally be allowed by right in single-family residential zoning districts, subject to state requirements and applicable reasonable local rules.
Read the official state guidance ↗Size matters
The state definition generally caps a qualifying ADU at 900 sq. ft. or half the principal home's gross floor area, whichever is smaller.
Local requirements still apply
Permits, building and fire codes, setbacks, utilities, septic/Title 5 and other site-specific rules may affect your project.
Check before you build
Requirements can vary by property and municipality. Confirm the current rules with your local building department and qualified professionals.
General information only—not legal, zoning, tax or construction advice. Eligibility and requirements depend on the property and current regulations.
Homeowner voices
Good spaces.
Good experiences.
Clear communication and thoughtful planning are an important part of every project. Here are the testimonials currently featured in the supplied website content.
★★★★★
“A very positive experience from the first conversation. The team helped us understand the options and think through the details.”
MKMansour K.Homeowner
★★★★★
“The process felt much easier with clear communication and guidance at each stage. We appreciated the thoughtful approach.”
KHKen H.Homeowner
★★★★★
“Helpful, professional and focused on finding a practical solution. We felt our questions were heard throughout the process.”
MYMo Y.Homeowner