Transform Your Home with a Stunning Three-Season Room: Ideas & Tips
May 12, 2025 •Brian Hogan

Few things are more relaxing than spending time outdoors. Unfortunately, as all of us in the Chicago area know, the weather doesn't always cooperate. Enter the three-season room, a type of indoor-outdoor space that lets you get natural light and fresh air without being exposed to the elements.
A three-season room, also called a three-season sunroom, can function like an extended family room or dining room. Its roof and operable windows create a protected and comfortable space for you and your family to use most of the year.
A three-season sunroom isn't designed to be used during the most extreme weather, so it's not quite a year-round space. But it's more affordable to build than a four-season room, making it a solid choice for many homeowners.
In this post, I'll dive into all the details of three-season rooms, including their benefits and design and how they are different from a four-season sunroom or a typical deck or porch.
What Is a Three-Season Room?
As the name clearly indicates, a three-season room is a space that is intended to be used during three seasons of the year, typically spring, summer, and fall. It is usually designed with large windows and glass doors that provide abundant natural light and ventilation.
Depending on your lot, a three-season room can be built to offer easy access to your yard or to an uncovered exterior deck or patio.
Three-season rooms can be used for a variety of purposes. Most people treat them as a living room or family gathering space, like a porch but with comfier furniture and better protection from wind and rain. However, they can also be used as a dining room, quiet reading area, entertainment space, or yoga or exercise studio.
You may hear people refer to a three-season room as a three-season sunroom or a three-season porch. Regardless of the specific term, the idea is the same.
Benefits of a Three-Season Sunroom
A three-season sunroom expands your living space. Whether it's for quietly relaxing or hosting parties with friends and neighbors, a three-season room gives you the flexibility to enjoy your home in new ways.
On warm or mild days, you can open the windows and doors. But if there's bad weather, blistering sun, or annoying bugs, your three-season sunroom is a shaded refuge.
It allows you to comfortably soak up natural light without being subject to the elements. As a result, this type of addition to your home can be used much more frequently than an exposed porch, deck, or patio.
You can actually construct a three-season sunroom in the same place as an existing porch or patio, making it a cost-effective option. You can also use it as a middle point between your house and yard, offering a seamless transition between indoor and outdoor spaces.
What's the Difference Between a Three-Season Sunroom and a Four-Season Sunroom?
The main difference between a three-season and four-season sunroom is that a four-season room has additional design elements that make it usable despite more extreme temperatures.
With a system for heating and cooling, an all-season room can remain comfortable during frigid winter nights and hot summer days. Four-season sunrooms may connect with your home's HVAC or have their own mini-split system for heating and air conditioning. To complement this, all-season sunrooms have more robust insulation.
In a three-season sunroom, it's more common to have single-pane glass and a more limited system of heating and cooling, such as a ceiling fan for hot days or a space heater for cold ones.
As a result, a three-season sunroom is not designed to be a place where you and your family would spend considerable time during our region's more extreme weather, especially in the winter.
Because of these differences, three-season sunrooms generally cost less to build.
How Is a Three-Season Room Different Than a Screened-In Porch?
A three-season room is enclosed with glass, offering better protection from the elements than a screened porch, which is only enclosed with screens.
Although a screened-in porch can let fresh air in and keep bugs out, it's far less helpful when it's rainy or windy. And because a screened porch has no insulation, heating and cooling systems aren't really an option.
For these reasons, a screened-in porch is better for hot climates or for occasional use when it's nice outside. A three-season room is usable for more of the year, and, because of that, it's a better choice for extending the living space of your home.
Can I Convert My Porch to a 3-Season Room?
One way to upgrade your existing porch is with a sunroom addition, turning the porch area into a three-season sunroom. This type of remodel doesn't add additional space to your house; instead, it makes your current space more usable by adding windows and weatherproofing.
Design Ideas for a Three-Season Room
When building out a sunroom, you can choose different features to suit your needs and stylistic preferences.
-
Windows and entries: Most sunrooms have large glass windows and doors to your home and to the outside. You can decide how many windows you want to actually open and close and whether to install screens to keep out bugs. For the entries, you can choose from various options, including traditional doors, sliding glass doors, or French doors.
-
Roofing: Depending on your sense of style and the look of the rest of your house, you can opt for a solid roof or install skylights for additional illumination.
-
Ceiling: Many homeowners opt for a more open ceiling to give their sunroom a spacious feel, but you can also consider an exposed beam or other elements that contribute visual appeal to the space.
-
Decoration: You can put your personal mark on the sunroom by decorating it to your liking. Some people incorporate natural materials like wood and stone to accompany the outdoor feel. Others opt for bright colors on the walls, which can feel energetic in a light-filled room. Others prefer darker tones to make their sunroom feel warm and cozy.
-
Furniture: You can select furniture for your sunroom based on the room's size and how you plan to use it. If you envision an entertaining space, you may want a larger dining table and ample seating. If your goal is relaxation, a sofa or reclining chairs may be your best bet. If you have an adjoining outdoor patio, you could consider having lightweight furniture that you can easily move in or out based on the weather.
-
Unique or convenient elements: Although it can add some extra cost, you can consider installing extra features in your sunroom. Electrical connections enable you to set up a TV and have convenient outlets available. For a homey look, you can add a stone fireplace or an electric fireplace to provide a unique focal point in the room.
Crafting Your Perfect Sunroom
Even though a three-season porch may not seem like the most complex space, it provides you with considerable flexibility to customize the design for you and your family. In this way, it's a major upgrade from a traditional summer porch or backyard patio.
Hogan Design & Construction specializes in high-end remodeling solutions, including three-season porches and year-round sunrooms. We work closely with our clients to design every element to make the space functional and beautiful. And with deep roots in the Chicago and southern Wisconsin area, we know exactly what the seasons here are like and how to design a sunroom accordingly.
We invite you to explore our website to learn more about our process and our team. If you're considering a remodel, don't hesitate to schedule an appointment to discuss how we can help turn your vision into a reality.