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Accessory Dwelling Unit Contractor in Boston Metrowest

Thoughtful ADU Design for Family, Flexibility, and the Future

Accessory Dwelling Units for Flexible, Long-Term Living

An accessory dwelling unit, or ADU, is a self-contained living space that can give homeowners more flexibility without requiring a move. ADUs may be used for aging parents, adult children, caregivers, guests, or other long-term household needs.

Thomas Buckborough & Associates designs and builds ADUs that are thoughtfully incorporated into the home and property. We are a design-build contractor, so we consider architecture, feasibility, budget, permitting, and construction together from the beginning.

We work with homeowners throughout Greater Boston and Boston Metrowest on basement and attic conversions, garage and carriage house renovations, attached additions, and ADUs that are part of larger remodeling projects.

Expansive view of a contemporary home with unique architectural features and a garage, designed by Thomas Buckborough & Associates in Acton, MA

Is Your Acton or Greater Boston Property a Good Fit for an ADU?

Massachusetts’ new ADU regulations have made it easier for many homeowners to add an accessory dwelling unit. Under the current state rules, one qualifying ADU is allowed by right in single-family residential zoning districts, although other building, site, and permitting requirements still apply.

Determining if an ADU is a good fit for a particular property still depends on several factors, including:

  • Available space and existing conditions
  • Site layout, access, and setbacks
  • Structure, utilities, and septic capacity
  • Privacy, accessibility, and long-term use
  • Overall project scope and investment

We help homeowners evaluate these questions early through design and feasibility planning. The goal is to understand what the property can realistically support, compare options when there is more than one approach, and develop an ADU plan that makes sense for the home, budget, and long-term use.

What Kind of ADU Projects Does Thomas Buckborough & Associates Take On?

Thomas Buckborough & Associates focuses on basement and attic ADUs, garage and carriage house conversions, attached additions, and ADUs incorporated into larger remodels.

Basement living area with a couch and a rug.

Basement and Attic ADUs

Basements and attics can sometimes be converted into independent living space without expanding the home's footprint. Feasibility depends on factors such as ceiling height, egress, access, natural light, utilities, and structural conditions.

This can be a strong option for homeowners looking for an in-law suite in Greater Boston or a flexible way to keep family close while preserving privacy.

Yellow garage with a living space above it.

Garage and Carriage House Conversions

An existing garage or carriage house may offer an opportunity to create a separate living space while using a structure already connected to the property.

These projects often require updates to foundations, utilities, insulation, access, and other parts of the existing structure. We focus on making the finished space work naturally with the rest of the property.

Snow-covered exterior of a classic brick home with a modernized rear addition by Thomas Buckborough & Associates, Acton, MA

Attached ADU Additions

An attached addition can be a strong option when the existing home does not have enough suitable space for an ADU.

These projects allow greater flexibility in layout, accessibility, and privacy, while also requiring careful consideration of how the new space connects to the house. Rooflines, windows, materials, proportions, and circulation all play a role in making the addition feel like it belongs.

Front exterior of a modern home featuring a stylish glass and metal railing, designed by Thomas Buckborough & Associates in Acton, MA

ADUs as Part of a Larger Remodel

An ADU can be designed as part of a larger whole-home remodeling project rather than as a separate project.

For example, a homeowner may create private living space while also improving accessibility, reworking circulation, remodeling the first floor, or updating other areas of the home. We can plan the ADU alongside those broader changes so that the spaces work together as a single project.

What Does It Cost to Build an ADU in Acton or Boston, Massachusetts?

For the types of ADU projects described here, homeowners can generally plan to invest about $200,000 to $1 million, depending on the project type, existing conditions, and scope of work. Converting an attic or basement is very different from renovating a carriage house or building a new attached addition.

ADU Project Type

Typical Investment Range

Basement or attic ADU

$200,000 to $400,000

Garage or carriage house conversion

$500,000 to $800,000

Attached ADU addition

$600,000 to $1 million

Actual costs depend on the condition of the existing structure, utility work, site access, architectural complexity, finishes, and permitting requirements.

How Long Does an ADU Project Take?

An ADU project typically takes about 3 to 6 months for design and 4 to 8 months for construction, plus additional time for permitting or municipal approvals when required.

The exact timeline depends on the project type, existing conditions, and the complexity of the work.

Warm and inviting master suite with large windows and dark wood furnishings, part of a Boston home addition project

Our Design-Build Process

Unlike traditional "design-bid-build" models, our integrated design-build process creates collaboration, cost control, and stunning results. Here's what you can expect:

1 | Collaborative Design & Planning
Every successful remodel starts with a clear vision and thoughtful planning. We begin with a detailed consultation to understand your goals, preferences, and budget. Our design team then creates customized concepts, offering 3D renderings and expert recommendations to ensure your new space is both stunning and functional.
2 | Seamless Project Management
With our design-build approach, we handle everything—from permits to construction. Our team manages timelines, materials, and communication so you don’t have to. Weekly updates and on-site project oversight ensure that every detail aligns with your vision, keeping the process smooth and stress-free.
3 | Excellence Delivered
Your home deserves the highest level of craftsmanship. From precision carpentry to luxury finishes, we execute each project with meticulous care. Before we consider your project complete, we conduct a detailed walkthrough to ensure your space is perfect, functional, and built to last.

Frequently Asked Questions About ADUs in Boston Metrowest 

Can an ADU be used as an in-law suite?expand_more

Yes, an ADU can be a good option for aging parents or other family members who want privacy and independence while remaining close to the main household.

The design can also account for accessibility, separate entrances, privacy, and future use of the space.

Can I convert my garage, carriage house, basement, or attic into an ADU?expand_more

Existing spaces such as basements, attics, garages, and carriage houses can sometimes be converted into ADUs, but feasibility depends on the structure, access, ceiling heights, utilities, egress, site conditions, and applicable building requirements.

A feasibility study can help determine which option makes the most sense before moving too far into the design phase.

Do Massachusetts ADU regulations allow me to build one on any property?expand_more

Not necessarily: Massachusetts’ updated ADU rules have made qualifying ADUs easier to pursue, but building, site, utility, septic, and local requirements can still affect what is possible on a specific property.

What should I look for when choosing an ADU contractor in Acton or Boston, Massachusetts?expand_more

Look for an ADU contractor who can evaluate more than just construction. The right team should be able to consider the existing home, site conditions, design, feasibility, permitting, utilities, budget, and construction together.

For projects involving an existing house, garage, carriage house, or attached addition, experience with remodeling and architectural integration can be especially important.

Is an ADU the same as a detached backyard cottage?expand_more

Not always. A detached backyard structure is one type of ADU, but ADUs can also be located inside an existing home, within a garage or carriage house, or in an attached addition.

We primarily focus on ADUs that are integrated into an existing home or structure rather than simple standalone backyard units.

Can an ADU be part of a larger remodeling project?expand_more

Yes, an ADU can be planned alongside a whole-home remodel, first-floor reconfiguration, accessibility improvements, or other major changes to the property.

Planning the ADU as part of the larger project can help the layout, circulation, utilities, and design work together more effectively.

Thomas Buckborough Home Remodeling Cost Guide Graphic

Remodeling Cost Guide

Planning a home renovation but unsure about the budget? Our Remodeling Cost Guide gives you real insights into what to expect, helping you plan with confidence.

  • Breakdown of remodeling costs for kitchens, bathrooms, and whole-home renovations
  • Expert budgeting tips to help you maximize value without surprises
  • Local cost insights specific to Acton, Greater Boston, and surrounding areas

Where We Work

At Thomas Buckborough & Associates, we proudly serve homeowners in Acton and Greater Boston, delivering high-end home remodeling services with a seamless design-build approach. Our team specializes in transforming homes across a variety of communities, ensuring each project is customized to fit the unique character and needs of the area. Whether you’re in Acton, Concord, Lexington, or the surrounding towns, we’re here to bring your vision to life.

Don’t see your town listed? We may still serve your area! Contact us today to discuss your project and find out if we can bring our expert remodeling services to your home.

Our Service Area

  • Acton
  • Greater Boston Area
  • Concord
  • Lexington
  • Boxborough
  • Newton
  • Harvard
  • Sudbury
  • Weston
  • Wayland
  • Carlisle
  • Lincoln
  • Bedford

Thomas Buckborough & Associates is rated 5.0★ on Google. Read our reviews!

Modern kitchen remodel in Acton, MA by Thomas Buckborough & Associates, featuring white shaker cabinets, quartz countertops, and pendant lighting

What Our Clients Think

"We are very pleased with our new kitchen! Thomas created a plan that worked well for us, and gave the kitchen the updated and warm look we were looking for. We were very happy with the quality of the work and excellent communication throughout. On time and on budget. Lead carpenter (Jon) was a pleasure to have on the job every day, and did a great job in minimizing the impact on rest of our home. Subs were first rate. And when we couldn’t vent the exhaust fan out the roof, and there were issues with the long run to vent out the back of house, the TBA team persisted and went the extra mile to resolve the issue. Called in an HVAC Co. to make it right. Much appreciated for an unanticipated problem. Highly recommend TBA!"

Camille Venti

Kitchen Remodel

Luxury kitchen remodel in Acton, MA by Thomas Buckborough & Associates, featuring gray cabinetry, quartz countertops, and modern pendant lighting

What Our Clients Think

"We had a very good experience with TBA in the remodel of our kitchen.  I thought having a local designer and a locally available team was a real advantage.  It allowed them to quickly respond to scheduling opportunities and keep the project moving on time and on budget.  I also thought their on-the-ground team was very strong and that they were very good at communication throughout the project, with standard weekly updates.  Overall, we were very happy with both the process and result."

Stephen Bertolami

Kitchen Remodel

Bright and spacious kitchen remodel in Acton, MA by Thomas Buckborough & Associates, featuring a white island, wood flooring, and modern lighting

What Our Clients Think

"I wanted to say thank you for helping us design our dream kitchen. We are still acclimating to this new beautiful space and love it more each day. Thanks to you your team the job went smoothly. We would highly recommend TBA to others."

Emile Biron

Kitchen Remodel

Custom kitchen remodel with blue cabinetry, marble countertops, and sleek stainless steel appliances in Boston, MA

What Our Clients Think

"We bought our house with one big flaw - a cramped, dark kitchen.  We had a vision for how to address this, but it was a tall order, including pulling a chimney out of our house.  Thomas and his team did a great job translating our loose dream into solid plans, and his company did a fine job turning that dream into reality, on time and budget!  I'd recommend his company to anyone looking for remodeling work!"

Christopher Lloyd

Kitchen Remodel

Elegant powder room renovation in Acton, MA, by Thomas Buckborough, with a framed mirror and a pedestal sink

What Our Clients Think

"If there were a day to give Thomas Buckborough more than five stars, I would do so. We first met him in 1995 when he was newly in business and took on a kitchen renovation (with some side jobs) for us. Since then, we have worked with him on at least five other projects, and each one has been completely successful. He and his crew just finished gutting and updating a bathroom.
Thomas is a skilled designer who listens to our thoughts and then improves them. Every single one of his crew, through the years, has been competent and delightful. We had another bathroom renovation going on during the pandemic, and they managed that with care and attention to safety.
I could not recommend him more highly."

Hester Schnipper

Kitchen & Bathroom Remodel

Warm-toned kitchen remodel in Acton, MA by Thomas Buckborough & Associates, featuring cherry wood cabinetry, quartz countertops, and a functional island

What Our Clients Think

"We have worked with Thomas Buckborough & Associates on several projects over the past eleven years. We have always found Thomas to make excellent design recommendations and to deliver exactly what we requested on time and on budget. Phone calls are returned promptly and questions are quickly answered. Recently Thomas and his team remodeled our kitchen. They always showed up as promised; completed tasks with a minimum of disruption; and came up with excellent solutions to all of the challenges that an older home provides (for example, walls being out of square or discovering hidden behind the wall prior electrical work that had not been done to code and needed to be brought up to current code). They did a beautiful job. Their attention to detail shines through. We couldn’t be happier."

Ion Abraham

Kitchen Remodel

Let’s Bring Your Vision to Life

Explore the Possibilities for an ADU

A successful ADU starts with understanding what you want the space to accomplish and what your home and property can realistically support. Thomas Buckborough & Associates helps homeowners work through those questions with one design-build team responsible from early planning through construction.

If you are looking for an ADU contractor in Massachusetts for an attached addition, conversion, in-law suite, or larger remodeling project, we would be glad to talk through what you are considering.