Accessory Dwelling Units
Expand your property’s potential with a custom Accessory Dwelling Unit (ADU) designed and built by Macco Construction! Based just outside of Boston, MA, we create backyard cottages, garage conversions, and in-law suites for homeowners across Boston and surrounding communities. Whether you’re building for family, rental income, or extra space, our team makes the ADU process simple and straightforward - from design and permits to a beautiful finished living space that feels like home.
In-Law Apartments & Guest Houses Built to Last.
With more than 34 years of construction experience, Macco Construction has helped shape homes and buildings all across the Boston area. We’ve renovated brownstones, rebuilt apartments, and transformed everyday spaces into something better. From large-scale projects to small home updates, our team brings the skill, organization, and local know-how to make every project run smoothly - and look incredible when it’s done.
Small Spaces. Big Possibilities!
Whether you already have ideas for your ADU or are working from scratch, we can follow your lead or help you discover new design ideas! Accessory Dwelling Units are becoming more and more popular particularly in the Greater Boston area where rents are so high. Our process from blueprint to completion is efficient and focused on quality so that you can utilize your new space as soon as possible.
Let's Talk Possibilities
It all starts with understanding your vision, property layout, and goals for your new space. We’ll review local zoning laws and help determine what type of ADU - detached, attached, or converted - works best for your home and budget.
Design That Fits Your Life
Our team helps you design a space that’s functional, beautiful, and fully compliant with Massachusetts building codes. From layouts to finishes, we make sure your new living area feels like a natural extension of your home.
Build With Confidence
Once plans are finalized, our crew gets to work - managing permits, scheduling, and construction with precision. You’ll stay informed every step of the way while we handle the heavy lifting (literally).
Move In and Enjoy!
After the final walkthrough, your new ADU will be ready for family, guests, or tenants to enjoy. Thoughtfully designed, built to last, and perfectly suited to your property — that’s the Macco Construction difference.
Custom ADU's for Homes and Investment Properties
A custom Accessory Dwelling Unit (ADU) can transform your property into something truly versatile — a space for family, guests, or additional income. Designed around your home and lifestyle, each ADU blends comfort, privacy, and smart use of space. From modern backyard cottages to fully equipped in-law suites, these projects add lasting value to homes throughout Greater Boston.
Backyard Cottages
Turn unused yard space into something extraordinary with a custom backyard cottage. Perfect for guests, rentals, or home offices, these detached ADUs offer privacy and charm while adding value to properties across Boston & the South Shore.
In-Law Suites
Keep loved ones close while giving them a space of their own. In-law suites combine comfort, accessibility, and independence — ideal for multigenerational living in Milton, Weymouth, and surrounding Massachusetts communities.
Garage Conversions
Transform your existing garage into a stylish, livable space without expanding your home’s footprint. Whether it’s a studio, guest apartment, or rental unit, garage conversions are one of the most efficient ways to add functional square footage.
Attached ADU's
Expand your home seamlessly with an attached ADU designed to match your existing layout and style. These connected living spaces blend convenience and privacy - perfect for family, guests, or long-term renters looking for a little comfort close to home.
Our Service Area
We serve all of the City of Boston and surrounding towns, as well as the South Shore, Massachusetts. Don't see your town listed? Don't worry! From Weston to Hingham, there's a good chance if you're near Boston we'll be able to help you out! Reach out through our website form and we are more than happy to discuss your upcoming project and location!
Boston
Brookline
Newton
Weston
Westwood
Hingham
Hanover
Somerville
Cambridge
Accessory Dwelling Unit FAQ's
If you have specific questions that you don't find here, don't worry! We're happy to answer any questions that you have regarding accessory dwelling units, in-law apartments and other types of guest housing! Just send us a message through our contact form or give us a call!
What is an Accessory Dwelling Unit (ADU)?
An ADU is a secondary living space built on the same property as your primary home. It can be a detached backyard cottage, basement suite, garage conversion, or attached addition, offering privacy and versatility for family or rental use. ADU's are definitely becoming more popular in the Boston area as rents increase and space is limited!
Are ADUs legal in Boston and surrounding towns?
Yes! Many Massachusetts communities, including Boston, Quincy, Milton, and Newton, allow ADU's under local zoning rules. Each town has specific requirements for size, parking, and occupancy, which we can help you navigate during the design phase of your project.
What are the benefits of adding an ADU to my property?
There are many! ADU's provide flexible living options! They are perfect for in-laws, adult children, guests, or potential tenants. They also increase your property’s overall value and can make multi-generational living easier and more private.
How long does it take to design and build an ADU in the Greater Boston area?
A full ADU project typically takes 4 to 8 months from design through completion, depending on permitting and current site conditions. Our team manages everything from zoning research to final inspection to keep your project on track and as efficient as possible.
Do I need a permit to build an ADU in Massachusetts?
Definitely. An ADU requires permits for zoning, construction, and utilities. We handle all the necessary applications and work closely with your city’s building department to ensure the project meets local and state regulations.
Can an ADU be used as a rental unit in Boston?
Yes, in many towns you can legally rent your ADU for long-term occupancy, provided it meets local zoning and safety standards. Short-term rentals (like an Airbnb) may have different restrictions depending on your municipality. Airbnb regulations from town to town have become more common, and we can help you do more research into this if this is the goal of your ADU.
Can I convert my existing garage or basement into an Accessory Dwelling Unit??
Yes. Garage and basement conversions are popular options for Boston-area homeowners because they use existing space and can be more cost-effective than new construction. We’ll ensure the area meets code for ceiling height, egress, and ventilation.
Can you match my Accessory Dwelling Unit’s design to my existing home?
Yes. We design ADU's that blend seamlessly with your home’s architecture and materials. From siding and roofing to interior finishes, every detail is chosen to complement your property’s overall look.
Check out Some of our Recent ADU Projects!
Check out some of our recent Accessory Dwelling Unit projects to see how homeowners across Greater Boston are transforming their properties. From cozy in-law suites to modern backyard cottages, each space is thoughtfully designed and beautifully built to fit the home, the lot, and the lifestyle. Get inspired and imagine what’s possible for your own property!
