REFRESH YOUR HOME: 50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus
Cocheco River valley · cold, damp, heavy snow
Siding, Windows, Roofing & Doors in Dover, NH
Dover's river-valley humidity keeps north-facing walls damp, and the New Hampshire freeze does the rest — opening joints, cracking old vinyl, and building ice at the eaves.
We install across downtown Dover, Garrison Hill, Dover Point and Sawyer Mills — on mill-era multifamilies, Victorians, capes and newer colonials.
Current offer: 50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus
730+
Towns served
19
Counties · 3 states
1,000+
5-star reviews
50+
Years combined experience
#1
James Hardie® in New England
Services in Dover
Everything we install in Dover, NH
Six products, one certified crew, one warranty conversation. Pick a product to see the full Dover detail — process, comparison, cost drivers, and local FAQ.
About Dover
The neighborhoods and housing stock we work on in Dover, NH
Dover's growing neighborhoods and its older mill-era stock need different specs, but the same building science: repair the sheathing, wrap it correctly, flash every opening, then install a product that doesn't absorb water.
Neighborhoods we serve
- downtown Dover
- Garrison Hill
- Dover Point
- Sawyer Mills
Common home styles
- mill-era multifamilies
- Victorians
- capes
- newer colonials
Local conditions
Cocheco River valley · cold, damp, heavy snow
Local knowledge
What Dover homes actually need
Dover's river-valley humidity keeps north-facing walls damp, and the New Hampshire freeze does the rest — opening joints, cracking old vinyl, and building ice at the eaves.
Nor'easters & wind-driven rain
Water is pushed uphill into laps, joints, and flashing. We build the wall to shed it and flash every opening — the panel is the last line of defense, not the only one.
Salt air
Salt breaks down field-applied paint and corrodes fasteners. Factory-finished fiber cement and correctly specified fastening are what survive it.
Freeze-thaw & ice dams
Trapped moisture expands and reopens every joint each winter. Proper intake-plus-ridge ventilation and heavy ice-and-water shield stop it at the roof.
Why Coastal
The credentials behind every Dover install
Manufacturer certifications aren't decoration — they're what makes the warranty real. An uncertified install voids most premium product warranties, which is why we hold the top tier with every manufacturer we represent and why every crew on your property is a W-2 employee, never a subcontractor.
Our promise
You don't pay until you're satisfied.
We walk the finished job with you before final payment. If something isn't right, it gets made right first.
Get your free estimate#1 James Hardie® contractor in New England
Elite Preferred status — the manufacturer's highest contractor tier — which is what keeps the HZ5® install and ColorPlus® finish warranties intact.
GAF Master Elite® roofer
A designation held by fewer than 2% of U.S. roofing contractors, and the only way to offer GAF's Golden Pledge® 25-year workmanship coverage.
Inc. 5000 honoree · woman-owned
Recognized on the Inc. 5000 list of America's fastest-growing private companies, and the #1 woman-owned construction company in New England.
EPA Lead-Safe Certified
Required for any home built before 1978 — which is most of the North Shore. Our W-2 crews follow lead-safe practice on every tear-off.
Reviews
What Dover and nearby homeowners say
“They made this experience personable and easy… so fast at returning my call. Emily was patient and answered all our questions.”
“Very happy with the speed of scheduling — completed the same day! Peace of mind going into the winter months. Thank you Coastal!”
“Great all-around process from selecting a product to pricing and installation. Everything cleaned up every day. Highly recommend.”
Recent projects
Projects near Dover, New Hampshire
Service area
Serving Dover and the surrounding New Hampshire coast
Same crews, same lifetime warranties, across 19 counties in Massachusetts, New Hampshire, and Maine. Don't see your town? Call 978-818-1503 — we probably still serve it.
How to use this map
- • Click a county to lock it, then open its page from the panel
- • Hovering only previews until something is locked
- • Filter by branch above; Tab and Enter also work
Counties we serve
Essex County, MA
- Towns
- 13
- ZIP codes
- 13
Top towns
Newburyport, Amesbury, Salem, Beverly, Gloucester +8 more
Serviced from
Beverly, MA branch
View Essex County →ZIP codes served in Dover
- 03820
Nearby town hubs
Browse up a level
Where can we help?
Check your ZIP code
FAQ
Common questions from Dover homeowners
We serve Dover and every surrounding community across Massachusetts, New Hampshire, and Maine. Local crews handle every install — same lifetime warranty across the entire service area.
Financing
Financing up to 20 years
Affordable monthly payments on full-exterior projects, with approved credit.
Ready for a straight answer on your Dover project?
We measure in person, inspect what's behind the siding, and put the full scope in writing before any work begins. 50% Off Installation + Financing up to 20 Years + $250 Online Booking Bonus.
Dover product pages