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Looking for a Licensed Addition Builder in Greater Boston?

If you’re researching contractors for a home addition or major remodel, you know the risk: the wrong hire means delays, hidden costs, and headaches that drag on for months.

Cap Construction is a fully licensed and insured general contractor based in Billerica, MA. We’ve built our reputation in the state’s most discerning communities — Wellesley, Newton, Lexington, and Winchester — by doing what most contractors won’t: showing up when we say, communicating clearly, and treating your home like it’s ours.

From the initial design consultation to the final walkthrough, we handle every detail — permitting, structural work, finishes — so you don’t have to manage a rotating cast of subcontractors.

About Cap Construction

Cap Construction is a licensed general contractor serving homeowners in Wellesley, Newton, Lexington, Winchester, and surrounding communities.

We specialize in home additions, second story builds, structural remodels, and living space expansions that require both design expertise and precision construction. What sets us apart is our commitment to full accountability on every project.

Whether you’re adding a first-floor suite in Newton, a second story in Lexington, or a full structural remodel in Wellesley — we bring the same level of focus and transparency to every build.

Some Of Our Services:

– Home Additions (Room Additions, In-Law Suites, Family Rooms)
– Second Story Additions
– Sunrooms & Three-Season Rooms
– Garage Conversions & ADUs
– Kitchen Expansions & Structural Remodels
– Basement Finishing

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Your perfect outdoor living space doesn’t need to be a hassle.

Why Massachusetts Homeowners Choose Cap Construction

Choosing the right contractor for a home addition or structural remodel is one of the most significant decisions you’ll make as a homeowner. Here’s what sets Cap Construction apart from every other name on your list:

Licensed General Contractor – Fully licensed, insured, and bonded for your protection
One Point of Contact, Start to Finish — You work directly with us from design through final walkthrough — no being handed off to a project manager you've never met
5-Star Rated with Real Reviews – See what your neighbors are saying about us in Greater Boston
We manage every permit application and coordinate directly with your town's building department — especially important in Wellesley, Newton, and Lexington where inspections are thorough

Ready to add the space your family needs? Request your free design consultation today and discover why Greater Boston homeowners trust Cap Construction.

Proudly Serving Greater Boston's Premier Communities

We specialize in home additions and structural remodels throughout the Greater Boston area, with a focused commitment to these communities:

Wellesley, MA — Custom additions and structural remodels for Wellesley's most discerning homeowners
Newton, MA — Second stories, in-law suites, and room additions that complement Newton's diverse architecture
Lexington, MA — Thoughtful additions built to honor historic character while delivering modern living space
Winchester, MA — High-end additions and remodels for Winchester's established neighborhoods
Billerica, MA — Our home base. Premium craftsmanship for homeowners throughout Billerica and surrounding MetroWest towns
Surrounding Communities — Burlington, Woburn, Wilmington, Chelmsford, Bedford, and across Greater Boston

Questions homeowners ask when selecting a contractor in Massachusetts

Here’s what sets Cap Construction apart — and direct answers to the questions you should be asking every contractor you consider.

FAQ'S

Question: How long does a home addition typically take?

Answer: Most room additions in the 400–800 sq ft range take 8–16 weeks from permit approval to completion. Second story additions run 16–24 weeks depending on scope. We build a detailed project schedule before we break ground and communicate every milestone — so you’re never left wondering what’s happening on your property.

Question: What does a home addition cost in Greater Boston?

Answer: Home additions in Wellesley, Newton, Lexington, and Winchester typically run $450–$600 per finished square foot, depending on complexity, structural requirements, and finish selections. We provide a fully itemized proposal before any work begins so you understand every line item — no vague estimates that quietly balloon by the end of the project.

Question: Do you have a portfolio of completed projects?

Answer: We share a full portfolio of completed additions and remodels during your consultation. For larger projects, we can connect you directly with past clients in your town so you can hear firsthand what the process was like. We have nothing to hide and everything to show.

Question: Are you licensed and insured?

Answer: Yes. Cap Construction holds a Massachusetts Home Improvement Contractor (HIC) license and carries full general liability insurance and workers’ compensation. We provide proof of both before signing any contract. Never hire a contractor who can’t produce current insurance documents — it puts your own homeowner’s policy at risk.

Question: How can homeowners get $1000 off?

Answer: Qualifying projects of $15,000 or more receive a $1,000 credit applied before work begins — our way of putting skin in the game from day one.

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