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 $3,600 and $8,600. This doesn’t include the cost to insulate the garage door, which is between $200 and $400. The total cost could be affected if there are items in the garage that 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 $2,000 and $4,000.
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.
Foam insulation in your garage has many benefits beyond creating a conditioned space. These include 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 that will give you a rough idea of the cost of your project. To use it, select the pole barn option and enter the measurements of your garage.
Key Points:
- Garage insulation costs vary depending on size, whether the space is finished, and the type of foam used.
- Unfinished garage walls insulated with spray foam typically cost between $2,000 and $4,000.
- Finished garage walls insulated with injection foam range from $3,000 to $4,000.
- Garage ceilings -- especially under bonus rooms -- usually cost $2,000 to $4,000 to insulate with foam.
- Foam insulation creates an air seal, making your garage more comfortable and helping reduce cold transfer to nearby rooms.
- Extra costs may apply if crews must move or cover items in the garage or if the garage door is also insulated.
- Foam insulation in your garage can help block odors, noise, and outside air while increasing overall energy efficiency.
Related Articles
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)
FAQs About Garage Insulation Costs
How much does it cost to insulate a 24x24 garage?
For a standard 24x24 garage, total insulation costs range between $3,600 and $8,600, depending on whether the walls and ceiling are finished and which foam type is used.
What's the difference between insulating finished vs. unfinished garage walls?
Finished walls require injection foam, which involves drilling small holes through drywall to fill wall cavities.
Unfinished walls use spray foam, which is applied directly to the open cavities.
Is spray foam or injection foam better for garages?
It depends on the garage setup.
Spray foam is ideal for exposed walls and ceilings because it expands to fill every gap. Injection foam is perfect for finished walls when you don't want to remove drywall.
Do I need to insulate my garage ceiling?
Yes, especially if there's a bonus room or living space above.
Insulating the garage ceiling prevents cold air from transferring upward, improving comfort in the rooms above.
Does insulating my garage help my home's energy efficiency?
Absolutely.
Sealing the common wall between the garage and home helps keep outdoor air, odors, and noise out while making it easier for your HVAC system to maintain consistent indoor temperatures.
