Sunroom contractors in New England
A sunroom sits between an addition and an outdoor project, and the price swings with one decision: three-season or four-season. A four-season room is an addition in every sense — foundation, insulation, HVAC, and full code compliance — while a three-season room skips most of that and gives up winter use.
Mid-range cost by metro
A 200 sq ft scope at a mid-range finish, with each metro's cost factor applied and a 10% contingency included. Estimates for budgeting, not quotes.
| Metro | Low | Likely | High |
|---|---|---|---|
| Boston, MA1.12× metro factor | $89k | $121k | $161k |
| Worcester, MA0.94× metro factor | $68k | $93k | $124k |
| Providence, RI1.02× metro factor | $70k | $95k | $127k |
| Hartford, CT0.98× metro factor | $69k | $94k | $125k |
| Manchester, NH1.00× metro factor | $64k | $87k | $117k |
| Portland, ME1.06× metro factor | $65k | $89k | $119k |
| Cambridge, MA1.14× metro factor | $90k | $123k | $164k |
| Lowell, MA0.96× metro factor | $76k | $104k | $138k |
| Springfield, MA0.90× metro factor | $62k | $85k | $113k |
| Stamford, CT1.10× metro factor | $79k | $107k | $143k |
| New Haven, CT0.99× metro factor | $68k | $93k | $124k |
| Portsmouth, NH1.05× metro factor | $65k | $89k | $119k |
| Nashua, NH1.01× metro factor | $65k | $88k | $118k |
| Bangor, ME0.93× metro factor | $55k | $75k | $100k |
| Burlington, VT1.03× metro factor | $64k | $87k | $116k |
| South Portland, ME1.03× metro factor | $64k | $87k | $116k |
| Westbrook, ME1.00× metro factor | $62k | $84k | $112k |
| Scarborough, ME1.04× metro factor | $64k | $88k | $117k |
| Falmouth, ME1.07× metro factor | $66k | $90k | $120k |
| Cape Elizabeth, ME1.08× metro factor | $67k | $91k | $121k |
| Biddeford, ME0.98× metro factor | $60k | $82k | $110k |
| Saco, ME0.99× metro factor | $61k | $83k | $111k |
| Brunswick, ME0.99× metro factor | $61k | $83k | $111k |
| Gorham, ME0.99× metro factor | $61k | $83k | $111k |
| Windham, ME0.98× metro factor | $60k | $82k | $110k |
| Yarmouth, ME1.05× metro factor | $65k | $88k | $118k |
| Freeport, ME1.02× metro factor | $63k | $86k | $114k |
Estimated range — based on BLS OEWS national average wages and BLS PPI material indexes applied to Our Haus baseline unit costs, as of June 2026. Estimates are shown as a range and help set expectations. They are not a quote, a verified price, or an appraisal of what a contractor will charge.
City guides
- Sunroom addition in Boston, MA
- Sunroom addition in Worcester, MA
- Sunroom addition in Providence, RI
- Sunroom addition in Hartford, CT
- Sunroom addition in Manchester, NH
- Sunroom addition in Portland, ME
- Sunroom addition in Cambridge, MA
- Sunroom addition in Lowell, MA
- Sunroom addition in Springfield, MA
- Sunroom addition in Stamford, CT
- Sunroom addition in New Haven, CT
- Sunroom addition in Portsmouth, NH
- Sunroom addition in Nashua, NH
- Sunroom addition in Bangor, ME
- Sunroom addition in Burlington, VT
- Sunroom addition in South Portland, ME
- Sunroom addition in Westbrook, ME
- Sunroom addition in Scarborough, ME
- Sunroom addition in Falmouth, ME
- Sunroom addition in Cape Elizabeth, ME
- Sunroom addition in Biddeford, ME
- Sunroom addition in Saco, ME
- Sunroom addition in Brunswick, ME
- Sunroom addition in Gorham, ME
- Sunroom addition in Windham, ME
- Sunroom addition in Yarmouth, ME
- Sunroom addition in Freeport, ME
What a complete estimate spells out
- • Three-season or four-season stated explicitly, with what that includes
- • Glass specification: low-E, gas fill, and frame thermal break
- • Foundation type and frost-depth compliance
- • How the room is heated and cooled, and whether existing equipment can carry it
- • Whether the room will count as finished living area, and the permit path that makes it so
Frequently asked questions
Is a three-season room worth it in New England?
For April-through-October use, often yes — it is the cheapest glass room you can add and carries a simpler permit path. Go in clear-eyed: unconditioned glass rooms are genuinely unusable in January, and they usually do not count as living area at appraisal.
Prefab system or stick-built?
Prefab room systems install fast and pencil well for three-season use. For a four-season room meant to live like part of the house, stick-built on a real foundation usually wins on comfort, appraisal treatment, and how well it matches the house.