REFRESH YOUR HOME: 50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus
Portsmouth, NH · Local Install Crew
Fiber-cement siding engineered for coastal weather.







About this product
James Hardie® fiber cement resists rot, moisture, pests, fire, and fading — the reason it is the most-installed premium siding in New England. As James Hardie Elite Preferred contractors, our crews follow the manufacturer's HZ5® best-practice install for our climate, which keeps the ColorPlus® finish warranty intact. Fiber cement returned 121% on the 2024 Remodeling Cost vs. Value report — the highest ROI of any major exterior upgrade.
Our process
Free in-home consultation, siding inspection, and full-elevation measurement
Color and profile selection from the ColorPlus® palette
Tear-off of existing siding and inspection of the sheathing underneath
Any rot or sheathing repair, then house wrap and moisture management
James Hardie HZ5® best-practice install with correct fastening and clearances
Trim, caulking, cleanup, final inspection, and warranty registration
How it compares
| Feature | James Hardie® | Wood or LP® Composite |
|---|---|---|
| Rot / moisture | Immune | Absorbs moisture, can rot |
| Fire rating | Class A (non-combustible) | Combustible |
| Repaint cycle | 15+ years | 5–7 years |
| Cost vs. Value ROI | 121% (2024 Remodeling) | 60–70% |
| Warranty | Lifetime product, 15-year ColorPlus® | 5–25 years |
Gallery

Reviews
★★★★★
"I've contacted Coastal twice for help with my house and both times they were extremely honest, helpful and responsive! The first time was to get an estimate for siding and to replace a window. I was told that I didn't actually need siding (yet) and the window that was broken should actually be under manufacturers warantee and the sash could be replaced for free! (This was after being told by another person that I needed to replace my siding asap and the window would only cost an additional $600!) Based on the trust they built the first time, I called them again for porch windows (which most certainly need replacing!). Tim A. and Terry O. came out and both were just as fantastic as the first person! They explained everything, provided a lot of info I hadn't known, gave a very fair price and were incredibly responsive through the whole process! 5 out of 5 would use them again!"
★★★★★
"I used Coastal Windows & Exteriors to put new siding on my house and install a new front door. Emily came to my house to go over the project with me. She helped me pick out the right siding and shutters even calling the owner of the company to discuss what color would match my roof. Emily is great very personable and she cares about you the customer. I met with Jeffrey and Emily to plan what I wanted for my door and they both helped me pick out and design my door. My house looks fantastic! It looks like a brand new house. The crew were fantastic and helped you with all your questions and quickly resolved any issues. The owners of the company David & Stephanie get involved and want you to be satisfied! The inside trim on my door was supposed to be desert sand and it was installed white and I wanted it to match my trim on my windows and doors. Emily came over to asess and fix the issue, matching the paint and going to sherwin williams to get the paint. She then painted the trim to match my doors. I can't say enough about this company! My light had to be moved to the opposite side of my front door so the shutters could fit. David coordinated their electrician to come and rewire. If you are thinking about having new siding, windows or doors installed you should definitely give this company a call.Donna Thompson"
★★★★★
"I haven't yet had the installation of my new siding and windows, but I've had the most wonderful experience with Coastal's courteous staff so far. Tim Alcott came to my house on three different occasions to talk to me about their products and services, and was friendly, knowledgeable and responsive. I really felt like he wanted to make sure I got exactly what I wanted. (The follow up thank you note via snail mail was a special touch!) Tim was a great introduction to this company - looking forward to my finished product soon!"
FAQ
Recent projects

Salem, MA

Hampton, NH

Salem, MA

Salem, MA

Salem, MA

Hampton, NH
Also in Portsmouth
Cost
Fiber-cement pricing depends on the square footage of siding, the number of stories and elevations, how much trim and detail work your home has, and what the crew finds once the old siding comes off — rotted sheathing or failed flashing adds scope. Profile choice (lap, shake, or board-and-batten) and ColorPlus® versus primed also move the number. We price it after a full on-site measure, and the written estimate includes any repair work we can see coming.
Current offer
50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus
Financing
Affordable monthly payments on full-exterior projects, with approved credit.
Service Area
Local crews, same-day dispatch. Not sure if we cover your street? Call 978-818-1503.
ZIP codes served
James Hardie® Siding 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