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How Much Does it Cost to Insulate a Garage with Foam Insulation in 2024?

garage insulation

How Much Does it Cost to Insulate a Garage with Foam Insulation in 2024? Blog Feature
Amanda Ringler

By: Amanda Ringler on January 13th, 2023

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You want your garage to be a conditioned and more comfortable space, so you’ve decided to insulate it with foam insulation.

The big question now is, how much will it cost to insulate your garage?

The cost to insulate your garage with foam insulation will vary depending on the project and square footage, but we’ll get more into that in a moment. Garage spray foam insulation is the only material that will create an air seal, making your garage a conditioned space.

RetroFoam of Michigan has been installing injection foam and spray foam insulation since 2002. With that experience, we know exactly how to insulate your garage in a way that will benefit you the most.

Now let’s talk about how much it’s going to cost to insulate your garage with foam.

How Much Does it Cost to Insulate a Garage?

Not every garage is built the same, but really, they are similar, at least in shape and design.

For this article, we will discuss the cost of insulating a garage that is 24x24. The cost to insulate the garage will depend not only on the size but also on whether the space is finished or not. If the walls have drywall, then injection foam is used. If the walls are exposed, then spray foam is used instead.

The total cost to insulate your garage walls and ceiling depends on the material you use. It could be between $3,500 and $8,000. This doesn’t include the cost to insulate the garage door, which is between $200 and $300. The total cost could be affected if there are items in the garage the crews need to move, cover, or work around.

Let’s look at the cost of finished and unfinished garage walls and ceilings.

Cost to Insulate an Unfinished Garage

Not everyone has a finished garage, and you don’t have any plans in the immediate future to throw up any drywall.

If this is the case, spray foam would be applied to the open wall cavities. Now you just have to choose between open cell spray foam or closed cell spray foam. This decision can also impact the cost of the project, as closed cell spray foam tends to be more expensive.

Spray foam insulation in the garage's exposed walls would be between $2,000 and $4,000.

Cost to Insulate a Finished Garage

If the garage walls are finished, the project will be more expensive.

That’s because crews will need to drill holes through the drywall, inject the foam, plug the holes, and create a rough patch where the holes were drilled. The good news is that the walls can be insulated without tearing all of your drywall out.

Insulating garage walls already drywalled would cost between $3,000 and $4,000.

Cost to Insulate a Garage Ceiling

Doing the garage ceiling is recommended, especially if a bonus room is above the space.

Homeowners complain pretty frequently that their bonus room is cold. That’s because the cold air coming in through the garage is coming up through the floor. Insulating the ceiling of the garage with foam, which is the underside of the floor of the bonus room, will help make that a more comfortable space.

The cost to insulate the ceiling of the garage depends on whether it is finished.

If there is drywall on the ceiling, then strips would need to be cut and the cavities sprayed. If the ceiling cavity is open, then no cutting is needed, and the foam is sprayed directly into the cavity. Spraying foam insulation on the garage ceiling would cost between $1,500 and $3,100.

Creating an Air Seal in Your Garage

You now have an idea of how much it will cost to insulate your garage with foam insulation.

There are many benefits to foam insulation in your garage that are more than just creating a conditioned space. This includes insulating the common wall of the garage to keep outside air out of your home, as well as sounds and smells. 

If you’d like to learn more about foam insulation and what it has to offer, check out the Learning Center on our website.

We also have a great budget calculator to give you a rough idea of the cost of your project. Just use the pole barn option on the calculator and enter the measurements of your garage.

Related Articles

Should I Insulate the Wall Between the Garage and House When Updating Exterior Wall Insulation with Foam?

Garage Insulation Problems: Things to Know Before You Insulate

What You Need to Know About Using a Garage Door Insulation Kit (How to/Manufacturers/Cost)

Insulation Budget Calculator

About Amanda Ringler

Amanda previously has worked as a breaking news and crime reporter, TV news producer, and editor in Flint and Detroit. Throughout her career as a journalist, she has won several awards from The Society of Professional Journalists - Detroit Chapter and the Michigan Press Association. As part of the RetroFoam of Michigan family, Amanda uses her experience as a journalist to write content that will help educate homeowners on the benefits of foam insulation. When Amanda isn’t writing, she’s spending time with her husband and rescued huskies. She also loves knitting, making art, cooking, and hosting dinner and a movie night for friends and family.