Additions & Expansionsin Southern NH & Northern MA
Add space to your home with seamless structural additions managed from permits to finish.

What We Handle
Adding on to a home is part construction, part surgery. You're tying new framing, roofline, and systems into a house that's already standing - and if the connection isn't planned right, you'll see it in the finish. We manage additions and expansions end to end, from the first structural conversation through the last piece of trim, so the new space feels like it was always part of the house.
The work starts before anything gets built. We walk the existing structure, bring in structural engineering where the design calls for it, and coordinate the permitting and inspections so the project moves instead of stalling. Foundations, framing, roof tie-ins, and the full run of mechanical, electrical, and plumbing all get scheduled and overseen by us - you're not the one calling the framer to find out why the electrician hasn't shown.
Every addition is different. A first-floor bump-out to enlarge a kitchen is a different animal than a full second-story addition or a new primary suite, and we scope each one for what it actually needs. Where the new space meets the old, we take extra care - matching siding and rooflines, blending floors and ceilings, and making the transition disappear.
Expanding a home isn't always about enclosed square footage. A ground-level or side-entry deck extends how you use the house without touching the interior - and we build them to last, with proper framing, composite decking, and clean stair and skirt details. Whether it's living space inside or out, the standard is the same.
You get one point of contact through the whole build. We schedule every trade, hold each one to our standard, and keep you current on where things stand and what's next. The crews on your project are people we work with again and again - not names pulled off a list.
If you're thinking about adding space anywhere in Southern New Hampshire or Northern Massachusetts, we'll walk the property, talk through what the structure can support, and hand you a clear written estimate. Straight answers, start to finish.
- Permitting and zoning coordination
- Structural engineering management
- Foundation and framing oversight
- Seamless integration with existing structure
- Full MEP (mechanical, electrical, plumbing) coordination
Recent Additions & Expansions Projects
“We were very pleased with J & M Contracting. They were professional and the area was clean & tidy when they were done for the day. Our deck was completed timely & within budget. I would highly recommend for any project.”
Doreen Rizzo · Merrimac, MA
Additions & Expansions — FAQs
Will an addition match the rest of my house?
Can you add a second story, or only build out?
Do I need an architect or engineer for an addition?
Can we live in the house during an addition?
Does an addition include a deck or outdoor space?
Who manages the trades and inspections on an addition?
Get a Quote for Your Additions & Expansions Project
We respond to every quote request within one business day.
