A detached ADU with red siding by Gilmore Building Co.

Custom Flexible Living Spaces in Boston MetroWest & Central Massachusetts

Many homeowners are running into the same challenge: you need more space, more flexibility, or a better way to support your family, but moving doesn’t make sense.

Whether it’s aging parents, adult children, or simply the need for privacy, the options can feel limited.

An Accessory Dwelling Unit (ADU) provides independent living space, but only when it’s thoughtfully designed and fully integrated into your property.

Gilmore Building Co. guides you through a design-build process that brings clarity to zoning, layout, and system planning so the space works not just on paper, but in real life.

If you’re considering an ADU and want to understand what’s possible for your property, we’d be happy to talk through your options.

Ready to Build Your Dream ADU?

Let's talk about your ADU goals with a no-pressure conversation. Schedule your consultation today.

Building Extra Living Spaces, In-Law Suites, and Backyard Cottages

One of the most overlooked factors is how the ADU and your main home work together. ADUs require careful planning to balance privacy, functionality, and local requirements. 

That’s why Gilmore Building Co. works with homeowners from the earliest stages to ensure the ADU is fully thought through before construction begins.

A structured design-build approach simplifies complex decisions and reduces risk throughout the project by:

  • Evaluating the feasibility of your property and local regulations
  • Developing a layout that balances independence and connection
  • Aligning design decisions with realistic budgets
  • Integrating energy-efficient systems where they add real value
  • Coordinating all design and construction under one roof

The result is an ADU that feels intentional, functions well, fits your property, and supports how your family grows over time.

Interior of a multi-level garage workspace by Gilmore Building Co.
Image of a carriage house and garage by Gilmore Design Build in Central Massachusetts

Popular Uses for ADUs in Boston MetroWest & Central Massachusetts

Most ADUs are built to solve real lifestyle needs, not simply to add square footage.

In Boston MetroWest and Central Massachusetts, homeowners are increasingly using ADUs to create flexible living arrangements that allow families to stay connected while maintaining privacy and independence.

Here are some of the most common ways local homeowners use ADUs:

  • Multigenerational living and in-law suites

  • Guest houses and backyard cottages

  • Home offices and flexible workspaces

  • Live-in caregiver or support housing

  • Future downsizing options or rental income

  • Recreational or relaxation spaces

Need project planning information? Talk with the Builder!

Image of custom ADU with covered garage and dormer windows in Boston MetroWest by Gilmore Building Co
Photo of custom ADU with pergola detail and black garage doors in Boston MetroWest by Gilmore Building Co
Photo of custom backyard ADU with modern siding and large windows in Boston MetroWest by Gilmore Building Co

An ADU, or Accessory Dwelling Unit, is a secondary living space located on the same property as the primary home. ADUs can be attached additions, detached structures, or spaces built above garages. They are often designed to provide independent living with features like a kitchen, bathroom, and sleeping area.

Most ADU projects in Boston MetroWest and Central Massachusetts range from $450,000 to $600,000+, depending on size, site conditions, utility requirements, and level of finish. Whether the ADU is detached, attached, or built as part of a larger remodeling project can also significantly affect cost.

Yes! Many homeowners build ADUs specifically to support long-term living for parents, relatives, or even to support their future selves. Features like first-floor living, accessible bathrooms, wider doorways, and energy-efficient systems can all be incorporated early in the design process.

 

Yes. ADU regulations vary by town throughout Boston MetroWest and Central Massachusetts. Setbacks, utility connections, parking requirements, and property layout all impact the feasibility. Early planning is important because zoning and permitting requirements often affect both the design and project timeline.

 

A FEW REVIEWS BY OUR CLIENTS

Photo of new-old-home

"While relocating to New England, we researched 100's of homes on-line and through site visits until our real estate agent showed us a new old home designed and built by Gilmore. Upon arrival at this home, we were immediately impressed by the unique yet classic look of the exterior. The interior layout and detailing showed there are still builders who are proud of what they do. When you see quality, you know it ...."

Photo of School House Styling Home

"The level of professionalism Gilmore brings to a project is excellent.  The design and build process really allowed us to explore and then narrow the project's scope of work with ease.  No other company could have applied the knowledge and architectural expertise needed to help us achieve the historic appearance goals we had.  The completed project exceeded our goals."

Photo of addition

"We can't say enough wonderful things about the work completed and the satisfying experience we had teaming with Gilmore Building Co.  Our project came in ahead of schedule and right on budget.  We love our new addition and our new kitchen and bath.  We would recommend Gilmore Building Co. for any project."

Image of a shingle-style home window by Gilmore Building Company in Central, MA

"After a long search, my wife and I found in the Gilmore Building Co. homes everything we believed to be important in a new home. From the classic New England styling, abundant trim work, top of the line mechanicals and hardware, exceptional layout of the kitchen, custom cabinets and high quality appliances. The quality and craftsmanship built into our home was obvious from the street but even more so when you step through the front door."

Photo of beach front shingle style home

"My husband and I spent over a year working with an architect to design our summer home for our family. The execution, workmanship and temperament of the builder were critical to us. Gilmore Building Co. surpassed our expectations throughout the very satisfying process."

Photo of saltbox style home

"We chose to work with Gilmore Building Co. because they presented themselves as offering a detailed project scope and budget, high-quality work and overall excellent communication. And indeed that is what we received - an overall seamless and successful project with a level of customer service and detail not normally seen in this industry. We would highly recommend Gilmore Building Company and look forward to working with them again on future projects."

Ready to Build Your Dream Home?

Let's talk about your ADU goals with a no-pressure conversation. Schedule your consultation today.

Where We Work

Gilmore Building Co. works throughout Boston MetroWest & Central MA, providing high-quality remodeling, custom homes, and additions tailored to each homeowner’s needs.

Our team brings reliable craftsmanship, thoughtful design, and local expertise to every project, ensuring a smooth process and results that enhance both function and value. 

Our Service Area

  • Grafton

  • Westborough

  • Southborough

  • Northborough

  • Hopkinton

  • Sutton

  • Upton

  • Shrewsbury 
  • Boylston
  • Needham

  • Carlisle
  • Westford
  • Harvard
  • Sudbury
  • Berlin
  • Sturbridge
  • Oxford
  • Millbury
  • Newton
  • Natick
  • Wellesley
  • Holliston
  • Stow 

Gilmore Building Company is a proud member of the following organizations: