Looking to add more living space to your home?
Need a guest house, a rental unit, or a private office right outside your back door?
We’re your trusted ADU builders in Greater Boston.
We make building your accessory dwelling unit (ADU) simple and stress-free.
An ADU, or accessory dwelling unit, is a small home built on the same property as your main house.
Some people call them in-law units, granny flats, backyard cottages, or tiny homes.
No matter what you call it, an ADU gives you more room to live, work, or rent—without having to move.
ADUs are usually:
From start to finish, most ADU construction projects take 6 to 12 months.
That includes design, permits, and construction.
The timeline depends on the type of ADU and how fast your town processes building permits.
No matter what type of ADU you want, we’ve got the skills and experience to build it right.
Building and ADU can do so much for property owners.
ADUs don’t need to be built from the ground up on-site.
If you’re looking for a faster or sometimes more affordable ADU option, modular or prefab could be a great fit.
What is a modular or prefab ADU?
A modular or prefab ADU is built in a factory.
Then it’s delivered to your property, usually in one or two large pieces.
Once it arrives, our team connects it to your foundation and hooks it up to plumbing, electrical, and HVAC systems.
These units are still high quality; they’re just built off-site instead of in your backyard.
What are the pros of prefab ADUs?
Are modular ADUs allowed in Massachusetts?
Yes—but just like with traditional builds, your local town must approve the design, zoning, and permits.
Some towns have specific requirements for the appearance of prefab homes and their placement on the property.
As experienced ADU contractors in Greater Boston, we’ll make sure your modular unit meets all local rules.
Do modular ADUs cost less?
They can cost less, especially when it comes to labor and time savings.
But you still need to prepare the site, pour a foundation, and hook everything up.
We’ll walk you through the total cost—whether it’s prefab or custom-built—so there are no surprises.
Can I customize a modular ADU?
Definitely! There are lots of floor plans, sizes, and finish options.
We’ll help you choose a model that fits your property and your lifestyle—or work with you to customize one to your needs.
ADU laws in Massachusetts vary depending on the city or town, but in 2021, the state made it easier to build these units.
A law known as the Affordable Homes Act allows cities and towns by-right zoning for ADUs statewide.
Here are some common ADU rules you’ll find across Greater Boston:
Every city and town is a little different.
For example, Cambridge, Somerville, and Newton have more flexible ADU rules.
Suburbs like Needham, Dedham, and Quincy have stricter zoning, but it’s still possible to build with the right team guiding you.
We know the ins and outs of local ADU regulations and will make sure your project follows the rules—no surprises, no delays.
The cost to build an ADU in Greater Boston can range from $150,000 to $400,000+, depending on the size, type, and level of finish.
Detached ADUs often cost more than garage conversions or basement apartments.
This is because they need their own foundations and utility connections.
But we’ll walk you through all your options to find a design that fits your budget and your goals.
We’ve built ADUs across the eastern part of Massachusetts—from Boston suburbs to the South Shore and MetroWest.
Our team knows the local rules, the best building practices, and how to work with city officials to get your ADU project approved.
We take care of it all:
If you’re just getting started or you already have plans drawn up, we can help at any stage.
And we’ll guide you through every step with clear communication and honest pricing.
Ready to Start?
Contact us today for a free consultation.
We’ll assess your property, discuss your goals, and review what’s possible.
No pressure—just straight answers and a plan you can feel good about.
📍 Serving Boston, Cambridge, Newton, Quincy, Brockton, and surrounding areas.
Call us at (617) 359-6060 to schedule your FREE consultation.
We design and construct beautiful outdoor living spaces in Greater Boston and surrounding suburbs.
