What is the difference between a three-season and four-season sunroom?

A three-season room is built for spring, summer, and fall, with screened or single-pane glass and no insulation, so it is not climate-controlled on the coldest or hottest days. A four-season room has insulated glass, walls, and roof and is heated and cooled like the rest of your home, so it is comfortable year round and adds heated square footage.

Can I use a sunroom through a Kansas City winter?

A four-season room, yes. With insulated glass and a heat source it stays comfortable through Kansas City winters. A three-season room is not built for sustained cold, so it is best enjoyed from spring through fall.

Do I need a permit to build a sunroom in the Kansas City metro?

Most KC-metro municipalities require a building permit for a sunroom addition, and requirements vary by city and HOA. Horizon Exteriors handles the permitting process as part of your project so the room is built to local code.

How long does it take to build a sunroom?

Timelines depend on the size, the structure, and permitting in your city. After your free consultation we provide a clear schedule before any work begins.

Will a sunroom add value to my home?

A well-built four-season room adds finished, heated square footage and a feature buyers notice. Even a three-season room expands how your family uses the home, which is part of why sunrooms are a popular Kansas City addition.

What does a sunroom cost?

Cost depends on whether you choose a three-season or four-season build, the size, the glass and roof system, and site conditions. Horizon Exteriors provides a written, itemized quote after a free in-home assessment.

Are your sunrooms built to handle Kansas City storms?

Yes. As an authorized Renaissance Patio Products dealer, Horizon Exteriors builds with systems engineered for high winds and Kansas City freeze-thaw swings, backed by a manufacturer lifetime product warranty.

Year-Round Comfort

Sunrooms in Kansas City

Expand your living space and enjoy the outdoors year-round with a beautiful sunroom for every Kansas City home.

What Goes Into Sunrooms in Kansas City

Imagine enjoying the beauty of the outdoors from the comfort of your home, no matter the weather. A custom sunroom from Horizon Exteriors allows you to do just that. Whether you want a cozy space to relax, a bright area for entertaining, or a playroom for the kids, our sunrooms are designed to fit your lifestyle and budget. Built with high-performance glass and durable materials, our sunrooms provide year-round comfort and energy efficiency.

We offer a variety of sunroom styles, including 3-season and 4-season rooms, to match your needs. Our expert team will work with you to design and build the perfect addition to your home.

Our Sunroom Options

Perfect for spring, summer, and fall, 3-season rooms offer protection from insects and rain while letting you enjoy the fresh air. They are a cost-effective way to add living space to your home.

Designed for year-round use, 4-season rooms feature insulated glass and thermally broken frames to keep you comfortable in the heat of summer and the chill of winter.

A budget-friendly first step into outdoor living. We screen and enclose patios and porches so you can enjoy the breeze without the bugs, built with engineered Renaissance systems.

The open-air complement to a sunroom. Aluminum louvered pergolas give you adjustable shade at the turn of a handle, and insulated patio covers keep the space usable rain or shine.

Three-Season vs Four-Season Sunroom: How to Choose

The biggest decision in any sunroom project is whether you want a three-season room or a four-season room. The difference comes down to insulation, climate control, and how you plan to use the space across a Kansas City year. Here is how they compare.

	Three-Season Room	Four-Season Room
Best for	Spring, summer, fall	Year-round living
Glass	Single-pane or screened	Insulated, Low-E double-pane
Walls and roof	Lighter, non-insulated	Fully insulated
Heating and cooling	Not climate-controlled	Tied into HVAC
KC winter use	Limited on cold days	Comfortable through winter
Adds heated square footage	No	Yes
Relative investment	Lower	Higher

Not sure which fits your home and budget? We walk you through both options during a free in-home consultation and recommend the right build for how you actually want to use the room.

Built With Renaissance Patio Products

Horizon Exteriors is an authorized Renaissance Patio Products dealer, so your sunroom is built on engineered systems, not improvised framing. Our four-season rooms use the Renaissance Lumino glass wall system with Low-E insulated glass, and our solid roof panels pair an aircraft-grade aluminum skin with a high-density insulating foam core to hold comfortable temperatures from the heat of July through the cold of January. Every Renaissance structure is engineered to withstand winds up to 175 mph and is backed by a lifetime product warranty, so the room you add today stands up to Kansas City weather for the long run.

As sunroom builders we handle sun room additions in Kansas City, MO and custom sunroom installation in Missouri as a true addition, not a kit. Sunroom installation in Kansas City means footings, permits and a finished interior, which is why homeowners look for sunroom contractors rather than a supplier.

Serving the Kansas City Metro

We proudly design and build custom sunrooms for homeowners across the entire metropolitan area.

Kansas City, MO

Independence, MO

Lee's Summit, MO

Overland Park, KS

Olathe, KS

Kansas City, KS

Why Add a Sunroom?

A sunroom is more than just an addition; it’s a lifestyle upgrade. It brings the outdoors in, providing a bright, airy space for relaxation, hobbies, or entertaining guests.

Key Advantages:

Frequently Asked Questions

Three Season Versus Four Season Sunrooms in Kansas City

The difference is not a marketing tier, it is whether the room is part of your conditioned envelope. A three season sunroom uses single glazing and is not heated or cooled, so it is genuinely pleasant from roughly April to October and closed up in January. A four season room is insulated, uses low-E double glazing, and ties into heating and cooling, which makes it usable every day of the year and changes both the permit and the foundation requirement.

In this climate most homeowners who start out asking for three season end up choosing four season once they see how much of the year they would lose. If budget forces a three season build, the smart move is to size the footings and framing so it can be upgraded later rather than rebuilt.

Three season, single glazed, not conditioned, roughly April to October

Four season, insulated and low-E, heated and cooled, usable year round

Four season needs a frost depth foundation and a conditioned space permit

Build three season on four season footings if you may upgrade later

What Actually Determines the Timeline

A sunroom is an addition, not a product installation, so the schedule is dominated by permitting and concrete rather than assembly. Plan review takes different amounts of time depending on the jurisdiction, HOA architectural review adds its own cycle in most subdivisions, and footings have to cure before framing starts. The glass itself is usually the shortest part of the job.

Do I need a foundation, or can it sit on the existing patio?

Almost never on the existing patio. A typical patio slab is four inches with no footing below frost depth, so it moves through the winter and takes the room with it. A conditioned four season room needs proper frost depth footings, and we will tell you at the measure if your existing slab can carry anything at all.

Ready to Upgrade Your Home?

Take the first step toward enhancing your home with a custom sunroom. Get a free, no-obligation quote tailored to your needs.