Sunrooms
Three-season and four-season sunrooms by Holloway Company
Sunrooms and Four-Season Rooms
“Sunroom” covers a lot of ground. It can mean a vinyl-windowed room off the back of the house that gets used eight months a year, or a fully insulated addition with its own heat that works as another living room in February. The two cost very different amounts and involve different construction.Holloway Company builds both. Sorting out which one you want is the first conversation, and it usually starts with a question: which months do you plan to be in there?
Three Season Room or Four Season Room?
This is the decision that drives everything else about the project, including the budget.
Three Season Room
Three-season rooms use vinyl glazing rather than insulated glass. They block wind, rain, pollen, and insects, and hold warmth well enough to stretch comfortable use from early spring into late fall. No foundation is required and there is no tie-in to your home's heating and cooling, which keeps both cost and construction time down. For most homeowners this is the practical answer.
Four Season Room
Four-season rooms are built with insulated glass and designed to stay comfortable in January. That means insulation, a proper foundation, and integration with your home's conditioned space. It is a heavier project, and it can count as finished square footage.
A three-season room is not a compromised four-season room. It is a different thing, with an openness a sealed room cannot match. On a mild October afternoon you can slide most of a wall open, which is not something an insulated glass room is built to do.
Sunspace Glazing Systems
Holloway Company is a Sunspace dealer, and the glazing choice does most of the work in determining how the finished room feels.
- WeatherMaster windows and doors. Vinyl panels that slide and stack, so you can open most of a wall on a mild day and close it against weather. They give direct control over light and airflow in a way fixed glass does not. This is the system used on our 2022 first-place NADRA project.
- WeatherMaster Plus. A bi-fold configuration available with either WeatherMaster panels or fully insulated glass. The bi-fold opens wider than sliding panels, and the insulated glass option is the route to four-season performance.
Converting a Porch You Already Have
Not every sunroom starts from bare ground. An existing covered porch, or the space under an elevated deck, can often be enclosed rather than built new, which is faster and less expensive than an addition.
What determines whether that works is how the original structure was framed: post spacing, roof pitch, floor construction, and whether the framing can carry a glazing system. We assess that before proposing it as an option.
A Recent Project
The 2022 NADRA Closed Porch First Place project was a 480 sf three-season room built on a 600 sf deck platform, with Sunspace WeatherMaster vinyl windows, Lincoln folding doors, and a gable roof with exposed rafters in a rustic stain.
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What Makes a Sunroom Comfortable
Glazing gets the attention. These are the details that determine whether the room actually gets used.