REFRESH YOUR HOME: 50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus
Portsmouth, NH · Local Install Crew
Replacement Windows in Portsmouth, NH
Triple-pane, energy-efficient windows built for New England winters.
About this product
Replacement Windows for Portsmouth homes
Every replacement window we install is custom-measured for your opening and sized to the fraction of an inch. Triple-pane glass with low-E coatings, foam-filled frames, and factory-certified installation cut drafts, quiet the house, and lower heating bills. Every window is covered by a limited lifetime warranty and installed by W-2 crews — never subcontractors.
- ✓ENERGY STAR® 7.0 certified
- ✓Triple-pane low-E glass
- ✓Foam-filled insulated frames
- ✓Custom-sized to the opening
- ✓Full-day install for most homes
- ✓Limited lifetime warranty
Our process
How we install Replacement Windows in Portsmouth
- 1
Free in-home consultation and precise opening-by-opening measurement
- 2
Custom manufacture — every window built to your exact opening size
- 3
Install-day protection: floors, furniture, and landscaping covered
- 4
Old-unit tear-out with EPA Lead-Safe practices on pre-1978 homes
- 5
Professional install, insulation, flashing, and exterior trim/capping
- 6
Full cleanup, walkthrough inspection, and warranty registration
How it compares
Coastal Triple-Pane vs. Standard Double-Pane
| Feature | Coastal Triple-Pane | Standard Double-Pane |
|---|---|---|
| Glass panes | 3 with low-E and argon | 2 with basic low-E |
| Frame | Foam-filled vinyl or fiberglass | Hollow vinyl |
| ENERGY STAR rating | 7.0 (Northern zone) | Baseline |
| Install crew | Factory-certified W-2 employees | Subcontracted |
| Warranty | Limited lifetime, transferable | 10–20 years |
Before & After
Real Replacement Windows transformation
Gallery
Replacement Windows — real installs
Reviews
What homeowners say about our Replacement Windows
★★★★★
"Contract was signed in August 13, 2025. Then they created a new contract in September. Took 3 weeks to come measure. Then they ordered windows a week after that. 11/3 and still waiting….they said it’ll be delivered 11/10. Almost 3 months but company said well as of the second contract it’s all working time lines. Production associate not the least bit helpful or empathetic. Go with a different company…."
★★★★★
"Cody and Theo were so good at explaining the window features and helping to point me toward the right style for an antique house. Windows look and work great. Delivery and install were on schedule and all was finished in two days."
★★★★★
"Mark and Theo came to our home this morning as we were contemplating new siding and windows. Both of them were great at providing suggestions, were both highly knowledgeable of the products Coastal provides and they both have very friendly personalities. We felt zero pressure to move forward but it was such a comfortable experience that we signed on the dotted line and are very excited to get our project started!Work is now complete!! We had such a great experience throughout the entire project. The James Hardie siding is beautiful and should stand the test of time being on the beach in Hampton New Hampshire. Our new windows are beautiful and wow what a difference in noise level in the house! Our point person Steve Schofield was extremely attentive and always available throughout the project. The crew was respectful, hardworking and showed up every day. We definitely recommend Coastal for any services they offer!"
FAQ
Replacement Windows — Portsmouth questions
Recent projects
Projects near Portsmouth, New Hampshire
Also in Portsmouth
Other products we install here
Cost
How much does Replacement Windows cost in Portsmouth, NH?
Window pricing is driven by how many openings you're replacing, the size and style of each unit (double-hung, casement, bay, or specialty shapes), the frame and glass package you choose, and the condition of the existing framing. Homes needing rot repair, custom capping, or difficult second- and third-story access take more labor. We don't quote a per-window price sight-unseen — we measure every opening in person and put the full scope in writing before any work begins.
Current offer
50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus
Financing
Financing up to 20 years
Affordable monthly payments on full-exterior projects, with approved credit.
Service Area
Serving Portsmouth & every surrounding New Hampshire town
Local crews, same-day dispatch. Not sure if we cover your street? Call 978-818-1503.
ZIP codes served
- 03801
Replacement Windows in nearby towns
Why Portsmouth chooses Coastal
Award-winning
7,000+ New England homeowners served
Factory-trained installers
James Hardie Elite Preferred
ProVia certified doors