Upgrade Your Deck or Patio

Transform your existing deck or patio into a new sunroom.

Enjoy the outdoors longer by turning your deck or patio into a sunroom! Want to finish the floor and decorate this space with comfortable furniture that will not have to be moved because of the weather? Let our factory trained carpenters enclose and seal this space with maintenance-free walls, doors and windows exclusively provided by Seaway Manufacturing.

Enclosed Porch - Year Round Sunroom
Upgraded Screen Porch
Sunroom under existing roof
Studio Sunroom - fill in under existing roofline
Three Season Sunrooms

Why choose a sunroom?

Gain living space.

Year-round functionality.

Excellent investment.

Enjoy outdoors.

No weather worries.


Quick construction process.

No bugs.

More affordable than conventional room addition.

Custom designed and built.

Safe play space for children and pets.

Increase your home’s value.

Vacation retreat in your own home.

Sunrooms done right. No hassles or surprises.

Our sunroom design consultant will come to your home, free of charge, to help you select the perfect solution from a variety of sunroom plans and sunroom design ideas. We will even leave you with a comprehensive, to-the-penny quote of the cost to add a sunroom for your consideration.

I’d like a free idea kit!

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    Special Offer
    Save up to $3,000
    on your new sunroom!
    Hurry! Offer ends soon.

    Project manager assigned to every account

    Online tracking throughout the whole process

    A “No Sub-Contractor” guarantee

    Only factory trained installers

    All permitting handled professionally

    Seaway Manufacturing Corp.

    We are New England’s Premier Seaway Sunrooms Installer!

    Every Seaway sunroom is custom designed, custom engineered, and custom built from top to bottom.

    You will be at ease in a gracious addition to your home, living your dreams, comfortable in your extra living space at a surprisingly reasonable cost. A small investment adds significant appreciation!

    Enjoy the outdoors all year long. Build a modern, year round season sunroom!

    Building a sunroom addition or glass room enclosure is the perfect way to enjoy the comforts of the indoors while experiencing the outdoors. Whether you’re looking for modular sunroom additions or a screened-in porch, we will custom design a sunroom just for you. There’s no need to learn how to build a sunroom—our specialized team has extensive experience in building designer sunrooms that are customized to your exact specifications.

    A fabulous new, modern sunroom addition will enhance your home enjoyment, improve your lifestyle, and also increase the value of your home. Independent surveys have shown that if you invest in a building a modern sunroom, the cost to build a sunroom comes back to you by adding value to your real estate. Typically, 100% of the cost of sunrooms is added on to the value of your home after 10 years of ownership. That’s like having a 10 year vacation… and getting all of your money back!

    Year Round GrandView Sunrooms

    Year Round GrandView Sunrooms

    Fully-insulated sunroom addition

    High-quality vinyl energy star-rated windows

    R30 roof available

    Insulated wall structure

    $1,000 less than standard construction

    Three Season BetterView Sunrooms

    Three Season BetterView Sunrooms

    High-quality, double-strength tempered glass windows and doors

    Engineered to meet or exceed all building codes

    Custom sunroom design specifically for your home

    Custom color matching available

    The most affordable sunroom alternative