• Patio Door Installation

    Beautiful sliding glass doors to improve your outdoor space

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  • Residential Window Installation

    Weather-tight, energy-saving windows from quality brands

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  • Front Door Installation

    Curb-appealing & secure entry door installation & replacement

    Shop Front Doors

Professional Window & Door Replacement & Installation

Seacoast Replacement Windows has the products and expertise service that you need for your replacement window and door projects. Contact Seacoast today and you’ll see that it’s the right choice for all of your window projects!

Located in Plaistow NH but covering all of southern New Hampshire and northeast Massachusetts, Seacoast Replacement Windows is owned and operated by Mike Lewis and John Sullivan. Combined they have over 20 years of experience selling and installing replacement windows. Mike and John are hands-on owners; they are the ones who visit customers’ homes to present their high quality replacement window products.

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Casement Windows

casement window

Double Hung Windows

double hung windows

Bay Windows

interior view of bow window above kitchen sink

Slider Windows

slider window

Quality Materials From The Best Brands

At Seacoast Replacement Windows, we don’t skimp on quality when it comes to our work and our materials. Our window and door replacement company in Plaistow NH provides both homeowners and businesses with dozens of door and window options from Andersen Windows & Doors, Harvey Building Products, and Soft-Lite Windows. All orders are placed by our staff on your behalf and installed by our experts.

View Past Projects

Patio & Sliding Doors

patio door

Front Entry Doors

Black entry door

Patio Doors With Blinds

windows with blinds

SILENTGUARD® Noise Reduction Windows

Introducing the SilentGuard® by Thermal Windows, a replacement window line specifically manufactured with SilentGuard, our special noise-reducing technology. SilentGuard® noise reduction windows are engineered to provide the optimum performance for your budget and your specific sound control need.

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Why Replace Doors & Windows

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residential home with new windows
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Improved home security

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Boost curb appeal

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Reduce heating expenses

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Eliminate air & water infiltration

Why Choose Seacoast

  • Free Project Estimates

  • Expertly Trained Specialists

  • Large Service Area Coverage

  • Unmatched Customer Service

  • Energy Efficient Products

  • Competitive Product & Service Warranties

They were amazing. Polite, quiet, respectful. Did an awesome job and no mess made. They even let my six year old son follow them around and ask them a bunch of questions. I would highly recommend this company to anyone!

Amy MFacebook Review

Mike and John was excellent you couldn’t ask for better people They did their work excellent they were very good I’d recommend them to anybody.

Marie TGoogle Business Review

I’ve used Seacoast several times. They have competitive prices and above all do superb work are very professional. I would recommend them to anyone!

Jay RGoogle Business Review