Home Addition Contractor
Home Addition Contractors & Construction Services in Central Massachusetts
Room additions, second-story additions and in-law suites, built by an in-house crew from permit to final walkthrough.
How much does a home addition cost in Massachusetts?
A single-room, ground-floor addition typically runs $35,000 to $70,000, or roughly $150 to $350 per square foot depending on finishes and complexity. Second-story additions run higher, generally $300 to $500 per square foot, since they involve new structural support and roofing work. Additions with a kitchen or bathroom (plumbing and electrical) cost more than a bedroom or family room addition of the same size.
That range reflects general Massachusetts market pricing. We confirm your exact number in writing after a free in-home visit and a look at your existing structure.
Why homeowners choose us for additions
- Permit-ready plans and full permit handling, including plumbing and electrical permits
- Structural assessment before we quote a second-story addition, not after
- One in-house crew from foundation to final finish, not a rotating set of subcontractors
- Flat-rate written quote before work starts
A home addition contractor plans, permits and builds new living space onto your house: a ground-floor room, a second story, an in-law suite, a bathroom or a primary suite. Mr. Gomes Remodeling assesses your existing structure first, prepares permit-ready plans, pulls the building, plumbing and electrical permits, and builds with one crew from foundation to final finish across Central Massachusetts.
What We Build
Types of home additions we build
Room additions
A ground-floor family room, bedroom or office on a new foundation, usually the lowest cost per square foot.
Second-story additions
New rooms built on top of your house without giving up yard space, after we confirm the structure can carry them.
In-law suites
Bedroom, bathroom and living space for a parent or adult child, built to Massachusetts code. Basements work too, see basement finishing.
Bathroom additions
A new full or half bath where the house never had one, with plumbing and electrical permits handled. Remodeling an existing bath instead? See bathroom remodeling.
Primary suite additions
A larger bedroom with its own bathroom and closet, added to the ground floor or a second story.
Bump-outs
A few extra feet for a kitchen, bathroom or living room without the scope of a full addition. Costs are in our home addition cost guide.
See The Work
Addition and construction projects from our portfolio
Home additions are featured in our project portfolio alongside kitchen, bathroom and exterior work.
View the portfolio →How It Works
What happens after you call
Consultation & structural assessment
We review your home's existing structure, foundation and framing to confirm what your addition needs before we price it.
Permit-ready plans & permitting
We prepare plans and pull the building, plumbing and electrical permits, then manage every inspection.
Construction & final walkthrough
Our crew builds the addition start to finish, and we walk it with you before calling the job done.
FAQ
Home addition questions Massachusetts homeowners ask
How much does a home addition cost in Massachusetts?
A single-room, ground-floor addition typically runs $35,000 to $70,000 in Massachusetts, or roughly $150 to $350 per square foot depending on finishes and complexity. Second-story additions run higher, generally $300 to $500 per square foot, since they involve new structural support and roofing work.
Do I need a permit for a home addition?
Yes. Any addition that increases your home's footprint or adds living space requires a building permit in Massachusetts, along with plumbing and electrical permits if those systems are extended. We pull all required permits and manage inspections as part of every addition project. See our full permit guide for more detail.
What is the difference between a ground-floor and second-story addition?
A ground-floor addition extends your home's footprint and requires a new foundation, which is usually less expensive per square foot. A second-story addition builds on top of your existing structure, which avoids losing yard space but requires verifying your existing foundation and framing can support the added weight, and typically costs more per square foot.
How long does a home addition take?
A single-room ground-floor addition typically takes 8 to 14 weeks from permit approval to completion, depending on size and season. Second-story additions and in-law suites with full plumbing typically take longer. We give you a written schedule before work begins.
Do you build bathroom additions?
Yes. We add full and half bathrooms as part of a larger addition or on their own, including the plumbing and electrical rough-in, permits and inspections. An addition with a bathroom costs more than a bedroom addition of the same size because of the plumbing work.
How do I choose a home addition contractor in Massachusetts?
Check that the contractor holds a Massachusetts Construction Supervisor License and Home Improvement Contractor registration, will assess your structure before quoting, pulls the permits in their own name, and gives you a written fixed-scope price. Mr. Gomes Remodeling holds CSL #CS-085498 and HIC Reg. #654604 and sends proof of license and insurance with every estimate.
Service Area
Construction services across Central Massachusetts
Planning Guides
Guides for your addition
Home Addition Cost in Massachusetts
Ground-floor rooms, bump-outs and second stories priced per square foot, plus permits and hidden costs.
Read the guide →Get your addition estimate
Free in-home visit. Written, fixed-scope quote. No obligation.