How Much Does It Cost To Insulate A Garage? (Is It Worth It?)

Kenneth Wilson

There’s no reason for you to suffer uncomfortable, scorching temperatures and soaring power bills because of your garage. In fact, thousands of homeowners in the United States consider garage insulation an excellent investment each year.

Insulated garage cost starts from $1,725 to $9,200, depending on the selected material and the overall size. Most attached garages will only need to insulate the external walls. The costs of garage door insulation (for a 9-foot-tall garage door) with batts or rigid foam ranges from $230 to $345. (Related: Garage Door Replacement Cost & Consumer Guide)

If you want to convert the room above your detached garage as a home office, kids' play place, or storage space, garage insulation is a must. It will help you transform the cold or stuffy room above the garage into a living space you’d love!

3 Parts of Garage Insulation

Familiarizing the components of your garage can help you ensure the insulation project won’t end up costing you more money in the long run.

With that said, let’s take a look at the three main parts of garage insulation:

Garage Ceilings

Your insulation contractor will most likely look into your garage ceiling first. It is because of its proximity to the above space. As such, air sealing and insulating the garage ceiling avoids cold floors or drafts– which may only make your indoor living space uncomfortable. Doing so also protects your home from dangerous auto emissions, which may eventually cause harm to your family.

Garage Walls

If your garage shares a wall with another room, this will require air sealing, insulation, and fire-rated drywall on your end. It will keep hot or cold temperatures outside your dwelling, even the space located above the garage. Not to mention, it also helps ensure the safety of your entire home. 

Garage Doors

For your reference, garage doors are often the source of heat inside the space– so it won't be easy to cool the garage without insulation. Any door in the home leading into the garage must be considered as an exterior door. With that in mind, it should be properly fit, insulated, and weather-stripped.

Most garages will have one designated door for a car. You can decide on installing a newly insulated door or retrofitting a current one with suitable insulation material. Doing so helps maintain both the garage and the living space above it at a comfortable temperature. Additionally, insulated doors prove to be stronger and dent-resistant. 

Factors Affecting Garage Insulation Costs

Here are some defining factors that may hike the garage insulation costs further.

Type of Insulation

Generally, there are four types of insulation for your garage ceiling, doors, and walls. Let’s discuss them in detail below.  

  • Reflective System Insulation Reflective insulation is the best insulation type for garage use. It is relatively cheap and easy to install.  This type of insulation is versatile; it doesn't collect moisture, is dust-proof, and will not stop working compared to other alternatives.  Hence, it's one material that is also popular for other applications beyond garage attics, walls, and garage doors. Reflective insulation is best for commercial and residential applications. 
  • Batt Insulation - Batt insulation proves to be an easy and inexpensive garage insulation method.  The installation process is relatively simple as well. Put it in place between the studs before covering it with a vapor barrier for an excellent finish.  It will require quite a lot of labor if walls are already installed inside the garage, though. Keep in mind that you may also need to replace the walls after the installation is complete.   Ideal to use in: behind drywall, inside walls, and ceilings. Batt insulation for your garage will cost $145 to $200 on average. 
  • Blown-in Insulation - Fortunately, blown-in insulation doesn't need to knock down walls (similar to batt insulation). Your contractor may drill a hole in the wall before blowing the insulation material inside.  This insulation type also takes less time to install but comes rather costly than other common garage insulation types.  Ideal for: attics, crawlspaces, and wall cavities. A standard blown-in insulation project for your garage will cost $1 to $1.50 per square foot. 
  • Foam Board Insulation - If you want to insulate the garage without installing drywall, you may opt to use a foam board featuring a radiant barrier.  However, you will need to check local building codes before installing this garage insulation type. Ensure the material is flame-tested as well. It is ideal for garage doors, starting at $0.44 to $0.65 per board foot. 

To help you determine the best garage insulation type for your needs, refer to the table below, discussing the pros and cons of popular insulation choices. 

Garage Insulation Type



Reflective System

Effectively reflects the heat away from the house, reducing cooling costs

Only commonly used in warmer climates 

Batt Insulation

Cost-efficient and easy to install

Lower R-value, and may contain eye and lung irritants

Blown-in Insulation

Eco-friendly and versatile insulation material

Susceptible to mold and rot if not sealed properly

Foam Board Insulation

Easy to install, doesn’t easily crack or split

Takes a while in wrapping around outlets, wires, and the like

Overall Size of the Space

Another influential variable in your garage insulation costs boils down to the total size of the space. Here’s a brief overview of the garage insulation costs depending on the size: 

Garage Size

Average Expenses

1-Car Garage


2-Car Garage


3-Car Garage


Converting your garage or the area above it into an extra living space can boost the value of your property accordingly.

Some popular garage conversion ideas include: 

  • Home office - You can choose to use your garage as a workspace, which will benefit people working from home. 
  • Spare bedroom - It's also possible to turn your garage into another sleeping space. The next time you have guests over, they may now opt to spend the night.  
  • A leisure area - A playroom, home gym, or a music room– you can convert your garage into a living space that fits your needs! 

Labor Costs

The labor costs of a garage insulation installation begin at $0.80 to $1 per square foot. The total expenses may reach $1,207 to $1,610.

If you want to make the most bang out of your buck, it’s best to get at least three estimates from different local contractors. Scheduling your project in the late fall or earlier winter season may also offer you great discounts. 

R-Values and U-Factors

Insulating or re-insulating your garage may require you to abide by requirements in your area, such as particular R-values and U-factors ratings.

If your property is located in moderate climates, R-13 insulation is already suitable. Meanwhile, R-19 insulation can be excellent for areas dealing with harsher climates. 

Energy Audit

Some properties may need an initial energy audit, which determines the need for residential air sealing. It uses various barriers to trap air– a common reading of cooled or heated air to leak outdoors or inside the area. The sealing costs begin from $345 to $690, depending on the amount of work required.

An energy audit will also let you know if your garage door is becoming a severe issue. If you want to invest in garage insulation, it's best to determine if you need newly insulated garage doors. 

Project Process of Garage Insulation

Here’s a step-by-step project process of a typical garage insulation installation:

  1. 1
    Your contractor will need to measure the size of your garage door to determine the right amount of insulation you need accurately. It includes measuring each garage door panel's dimensions.  
  2. 2
    The insulation material will be cut according to size with the proper materials to cover your project. Afterward, they can start adhering the cuts onto the garage ceiling, door, or walls. 
  3. 3
    Now it's time to wait. It is crucial to give your insulation ample time to completely dry, which generally takes a few hours. Note that the amount of time will depend on your contractor's chosen adhesive type. In some cases, you may need to wait a full day (24 hours) for the adhesive to bond completely. 
  4. 4
    An optional step is to apply a foam sealant. Doing so helps fill in the small gaps found on the garage door's foam panels or the walls inside the garage. 

Why Should I Insulate my Garage?

Insulating a garage is an excellent investment for homeowners looking to use their garage (or the space above it) as a workspace. Using the garage as a woodworking shop, dance studio, exercise area, or machine shop is also standard across the country.

Choosing to insulate a garage wall close to the home will also help you save on additional electricity costs. The walls are the primary reason for the heat in the garage and the entire house. Dealing with hot, uncomfortable garages will cost more in electricity– even if your garage entrance stays closed most of the time.

Another benefit involves soundproofing the area. It means you can either keep the sounds in or out, depending on your preference. This can be a life-saver if you live on a busy street, daily dealing with loud traffic noises.

Homeowners planning to convert the garage as a workshop or an area to practice the drums may also benefit as it prevents the noise from becoming a nuisance to your neighbors. 

Garage Insulation Pricing and Installation Cost Checklist

We asked the experts to help ensure every cent spent on your garage insulation project will be worth it. Here are some pro tips to keep in mind:

  • Secure at least three to five estimates before hiring a local contractor. Don't worry; most estimates are free. It won't cost you anything unless you're calling for repairs.
  • Browse for online reviews and testimonials from satisfied clients. This helps you ensure you’re signing with a capable contractor.
  • As much as possible, get prices in the late fall and early winter season. There are aggressive pricing discounts during a contractor's down season.  
  • Make room for an additional 7 to 15 percent more on top of your initial garage insulation expenses estimate. It will cover the extra fees on complex configurations, accessibility issues, and more. 

Garage Insulation: Frequently Asked Questions (FAQs)

Is insulating a garage worth it?

The simple answer is yes. It helps you maximize your energy efficiency, saving money from your monthly energy bills. In addition to its benefits, it also helps eliminate cold spots and balances your home's temperature. 

How much does garage insulation save?

Garage insulation can help you save up to 40% on energy bills, and re-insulating it may increase your energy efficiency at home. 

What is insulation R-value?

The one that measures the efficiency to stop heat transfer is the R-value of a type of insulation. Typically, a higher R-value means a better insulator. Here are the benefits that garage insulation can offer: 

  • Maximizing your home's energy efficiency
  • Comfortable home year-round
  • Soundproof feature
  • HVAC performance improves and becomes more efficient
  • It leads to a healthier environment

What is the best insulation for a detached garage?

The best insulation for most cases is fiberglass batts or rolls. It is considered the most common and classic form of detached garage insulation because of various reasons. They are easy to install and cost-effective while having a relatively good R-value. 

Is sealing your garage important after installing the insulation material? 

It is essential to take a quick inspection of the area once the garage installation is installed. Make sure to seal everything off, such as spaces with chemicals, including your car's exhaust. 

Final Thoughts

At the end of the day, garage insulation undoubtedly leaves a positive impact on your home’s comfort and energy efficiency as you know it.

Installing garage insulation will also help you cut costs on cooling and heating bills. Not to mention, you won’t have to break the bank on garage insulation installation expenses– as it has a relatively fair price.

We understand how tempting it is to attempt a DIY insulation project. Still, it’s best to look for a licensed and insured garage insulation contractor to ensure the installation job is done correctly and safely. 

Kenneth Wilson
October 13, 2021
Cost Guides, Interior

Kenneth Wilson

Retired contractor. Currently residing in Southwest Florida. Now in semi-retirement, I write and manage this blog focused on helping home owners make savvy decisions when it comes to finding contractors and getting their projects done. I also operate remodeling design service for homeowners.

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