How Much Does It Cost to Install a Sunroom?

Sunlight is essential for well-being. It helps increase the production of serotonin, which can boost your mood and fight off depression. It also produces vitamin D in your body, which helps build strong bones and may improve the appearance of your skin. A sunroom installation in your home can provide convenient access to natural light and the benefits of ultraviolet rays year-round. As a bonus, you create a cozy environment for entertaining.

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Like any home improvement project, when it comes to installing a sunroom, the first thing to consider is price. This article explores the different costs associated with installation so you can make your dream a reality.

What Is the Cheapest Way to Build a Sunroom?

The most cost-effective way to create a sunroom addition is by converting an existing living space into a patio enclosure or screen room. With the foundation already in place, you can significantly cut costs. These three-season sunrooms typically don’t have air conditioning or heat, so they're best enjoyed in spring through early fall.

If you have building experience and knowledge, you can also save hundreds or even thousands of dollars by completing the work on your own instead of hiring a professional. Prefab sunrooms are also an inexpensive option. Sunroom kits are manufactured in a factory and then delivered and assembled on-site.

How Much Does a Prefabricated Sunroom Cost?

Prefab sunrooms are custom-made to your exact specifications using frames made from aluminum or steel with fiberglass or glass wall panels. The pieces are delivered to your property and installed directly on an existing patio or deck. Adding a sunroom using prefabricated parts can go much faster than a traditional build. However, it still requires a local building permit prior to the start of installation.

As of 2025, the average cost of a prefab sunroom kit is $1,500 to $8,000 (CAD 2,075 to CAD 11,065).

How Much Does a 12 x 12 Sunroom Installation Cost?

The two most popular sunroom sizes are 12 x 12 and 16 x 24. These rooms have enough square footage to accommodate furniture and guests but aren't so large that they're difficult to maintain. The cost of having a 12 x 12 sunroom built varies depending on the type and quality of the materials.

Three-season rooms have glass walls but don't include heating and air conditioning. The average cost is $11,500 to $33,000 (CAD 15,897 to CAD 45,617). A four-season sunroom includes heating and air integration and runs between $28,500 and $47,500 (CAD 39,397 and CAD 65,662).

While these figures are estimates, the final cost for your room addition depends on the type of windows you choose, the number of doors, the style of flooring and the electrical features you decide to include. These options can add or subtract thousands from your total. You also need to consider whether it's a DIY project or you plan on hiring a professional contractor.

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How Long Does It Take to Build a Glass Enclosure Sunroom — and How Much Does It Cost?

The exact time it takes to build a glass three- or four-season room varies depending on the complexity of the design. It may take several days to install a prefab design on an existing base, while a more complex glass enclosure may take several weeks to several months. The process can be broken down into different phases:

• Design and permitting. If you’re having your sunroom professionally built, you need to sit down with a designer to finalize your design. Before building can begin, you have to apply for building permits through your local planning and zoning department. This step is extremely important and can sometimes cause delays in getting started.

• Site preparation. If you’re building a home addition instead of using an existing structure, some site preparation has to be completed before building can begin. This step includes clearing the area, leveling it and pouring a concrete foundation or building a reinforced deck.

• Construction. As previously stated, a prefab sunroom can go up in days. However, a custom-built sunroom can take several weeks or longer.

• Finishing. Once the structure is complete, an electrician must run electrical lines and install lights. Other finishing touches include laying floors, connecting the HVAC system and finishing the exterior to match the rest of your home. You also need to wait for a final inspection from your local municipality.

The final cost of a glass sunroom varies depending on the complexity of the project. Prefab kits installed on an existing foundation cost between $3,000 and $25,000 (CAD 4,147 and CAD 34,559), while a custom-built four-season sunroom with all glass walls and a glass ceiling can run between $30,000 and $150,000 (CAD 41,471 and CAD 207,354).

Does a Sunroom Add Value to Your Home?

Anytime you add living space to your home, you help increase the property value. However, some projects can hurt the resale value or provide a lower return on your investment. Like with most home additions, you can expect to increase the value of your home by about half of what you spend.

The average sunroom adds about $33,000 (CAD 45,617) to your home’s value, so it’s best to choose a design that doesn’t exceed those numbers. The more functional the space, the greater the value. Before you begin, it’s important to do your homework. Get multiple quotes on sunroom installation costs, check contractor references and consider your financing options.