Three-season & screen rooms

Open when the day is perfect. Closed when it is not.

A flexible outdoor room built around multi-track windows and screens—more protection than a screened porch, with the wide-open ventilation that makes spring and fall special.

Book a free design visitSee completed projects
Mattison three-season room with full-height multi-track windows
Best useSpring through fall
Open-air feelUp to 80% opening*
PanelsMulti-track vinyl glazing
StructureWood frame with protected finishes

How it is built

What is behind the finished room.

Every project is adapted to the existing home. This section shows the typical Mattison assembly so homeowners can compare real construction—not just finished pictures.

Typical three-season wall systemThe window and screen package is selected for ventilation and weather protection—not as conditioned living-space glass.
Three-season room wall cross sectionA labeled cutaway showing an insulated roof, multi-track vinyl window panels, insect screen, vinyl-sleeved wood framing, sill pan, flashing, and exterior deck structure.Roof finish + water barrierInsulated roof assemblyMulti-track vinyl panelsUp to 80% opening*Insect screenSill pan + flashingVinyl-sleeved wood frame*Depending on panel and track configuration.

Comfort & energy

Built for ventilation—not sold as conditioned space.

Three-season products manage breeze, insects, rain, and shoulder-season comfort. They are intentionally different from insulated all-season windows and should be compared on that basis.

Large screened openings

Stacking panels can open most of the wall area while the insect screen stays in place. Actual opening percentage depends on the track configuration.

Weather flexibility

Close the panels when wind, pollen, or rain arrives. Open them again when outdoor conditions are comfortable.

Roof comfort

An insulated roof assembly can reduce overhead heat gain and help the room feel more comfortable than an uninsulated porch roof.

Honest energy expectations

Flexible vinyl panels are not insulated glass units. Supplemental heat may take the chill off, but the room is not represented as year-round conditioned living space.

*Up to 80% opening applies to selected five-panel configurations. Three-season performance varies with sun exposure, wind, panel system, roof insulation, and whether the existing floor and walls are insulated.

Design choices

Make it fit your home.

  • Four-track or five-track panel configurations
  • Full-height walls, knee walls, or existing-porch conversions
  • Studio and gable roofs
  • Vinyl-sleeved posts and framing or upgraded finished trim
  • Screen doors, full-view doors, and coordinated entry options
  • Ceiling fans, lighting, gutters, railings, steps, and decking

Built around your house

See the construction before you commit.

We prepare drawings and a detailed contract before a deposit is due.

Schedule your consultation