The average cost to insulate a garage with closed-cell spray foam in the US is $3000 - $8000. While it may seem expensive, spray foam insulation is a long-term investment that improves energy efficiency, maintains stable temperatures, reduces noise, and protects stored items.
Whether you're planning to insulate a small one-car garage or a larger three-car space, understanding the costs involved and the factors that influence those costs is essential.
This guide covers everything you need to know about spray foam insulation for garages, from average costs and key cost factors to DIY versus professional installation options.
These cost estimates, as outlined in this guide, were calculated using the SPRAYMAN Spray Foam Insulation Calculator and current industry data from reputable sources.
By the end, you'll have a clear understanding of what to expect when insulating your garage with spray foam and how to make the most cost-effective decisions for your project.
What Is the Average Cost to Spray Foam a Garage?
The average cost to insulate a garage with spray foam is $5000. The cost is dependent on two important factors: garage size and type of spray foam insulation used. In terms of square footage, spray foam insulation costs an average of $1 to $4.5 per sq ft. Since we are focused on closed-cell spray foam, the price range for garage insulation will fall on the high end.
How Do Cost Factors Influence Garage Insulation?
Several factors go into consideration when calculating garage insulation cost. These factors include garage size, R-value, insulation type, labor cost, and complexity of installation. These factors play a major role in determining how much you will spend installing insulation in your garage.
How Does the Size of the Garage Affect Costs?
Garage size is a dominant factor when it comes to garage insulation. Naturally, the bigger the garage, the more insulation is needed to create an air seal. There are 4 common garage sizes: 12’x20’, 20’x20’, 24’x24’, and 24’x30’. The smallest size here is a 12’x20’ garage, and the biggest is 24x30. Typically, the most expensive garage to insulate would be a 24’x30’ garage. You can quickly calculate the cost of insulating your garage using this calculator.
How Does R-Value Needed for Garage Affect Costs?
R-value measures an insulating material’s level of thermal resistance. It indicates how well an insulation can resist the transfer of heat. Thus, garage insulation R-value measures how well the insulating material installed holds heat. The required R-value for garage wall insulation is R13-R21 and R30-R40 for ceilings.
Spray foam insulation R-value is between R2.5-R7, as discussed in detail in our blog on Understanding the Importance of R-Value in Spray Foam Insulation. Fiberglass insulation offers an R-value of R2.5. Generally, a higher R-value means a more expensive insulation. This means it is more expensive to insulate garage ceilings than garage walls.
How Does Insulation Type for Garage Affect Costs?
The type of insulating material used affects garage insulation cost. Each type has unique characteristics, pros, and cons. Spray foam is an expensive insulation choice, with an average garage insulation price of $1 to $4.5 per square foot. Nevertheless, spray foam provides superior thermal insulation and energy savings. Fiberglass batts and blown-in insulation are the cheaper insulation options. Their average cost per square foot is $0.5 to $2.5 and $1 to $2.8, respectively.
How Do Labor Costs for Garage Affect Costs?
Labor cost is proportional to garage size and insulation type. Large garage sizes would require more labor and materials. Professional contractors charge based on the size of the garage and your preferred insulation type. In addition, the labor cost to install insulation in a garage is based on the complexity of the job. For example, the labor cost for spray foam insulation typically ranges from $50 to $100 per hour.
How Much to Insulate a 12'x20' 1-Car Garage?
The cost to insulate a 12x20’ car garage with spray foam insulation is between $1500 and $5000. The value would differ if it is a 1-car garage with different dimensions. The cost to insulate a 12x20’ garage is vast due to factors such as location and type of insulation used.
The main areas in a garage are the door, walls, and ceilings. The actual garage insulation cost can be calculated by adding up the costs in these areas. Choosing between DIY or hiring a contractor also influences the cost to spray foam a garage. Labor cost for hiring professionals is $1100 to $3500 for a 240 sq ft area. Here is a highlight of the cost to insulate a garage ceiling and walls with their required R-value.
Cost to Insulate Garage Walls (R13-R21)
The average cost for garage wall insulation is $350 to $1500. A standard 1-car garage wall has a dimension of 240 sq ft. The cost to insulate the walls of a 1-car garage with spray foam, achieving an R-value of R13 - R21, is $1.5 to $3.5 per sq ft. The overall cost is largely dependent on the type of spray foam used.
Cost to Insulate Garage Ceiling (R30-R40)
The average cost to insulate a garage ceiling is $500 to $2500. In terms of sq ft, insulating a garage ceiling with R30 - R40 using spray foam costs $2 to $4.5. Garage ceilings require more insulation to create an air seal. Sometimes, the garage ceiling may have deep joists or be located directly under an insulated room.
How Much to Insulate a 20'x20' 2-Car Garage?
The cost to spray foam insulate garage with a 20’ x 20’ dimension is $2000 - $6000. Fiberglass and blown-in insulation are cheaper options for insulating a 2-car garage. There is also an additional labor cost between $2200 to $7000. Here is how much it will cost to insulate a garage ceiling and walls in a 2-car garage with their required R-value.
Cost to Insulate Garage Walls (R13-R21)
Spray foam wall insulation cost is $400 to $2000 for a 2-car garage with an R-value of R13 - R21. Fiberglass insulation costs $300 to $600, while rigid foam boards costs $600 to $1000.
Cost to Insulate Garage Ceiling (R30-R40)
The insulation cost for a 20x20’ car spray foam garage ceiling is $700 to $4000. Naturally, insulating garage ceilings requires more insulation, and labor costs tend to be higher due to the complexity of the installation.
How Much to Insulate a 24'x24' 2-Car Garage?
The cost to insulate a 24’ x 24’ garage is $3000 - $8000. Garage size influences the cost of insulation. The 24’x24’ garage will house 2 cars and some extra space for other purposes. The average cost to insulate a 24x24’ garage with spray foam is $6000. This includes spray foam garage ceilings, walls, and labor costs. Here is an estimate of spray foam garage insulation cost for these areas.
Cost to Insulate Garage Walls (R13-R21)
The average cost to spray foam insulate garage wall insulation is $500 to $3000. A 24x24’ 2-car garage wall has a dimension of 576 sq ft. The cost of insulate the walls with R13 - R21 depends on the type of insulation installed. The labor cost for insulating the 2-car garage wall is $1500 - $3500.
Cost To Insulate Garage Ceiling (R30-R40)
The cost to insulate a garage ceiling is $800 to $4200. There is an additional labor cost to be included which costs $1800 - $4200. This brings the average cost of insulating only the garage ceiling in a 24’x24’ garage to $5000.
How Much to Insulate a 24'x30' 3-Car Garage?
The cost to insulate a 24’ x 30’ garage is $4000 to $15,000. The average cost for insulating a 3-car garage using spray foam insulation is $10000. This is a big garage that can serve other purposes. Therefore, insulation must be installed properly by a professional.
Insulating garage ceilings, doors, and walls also affects the cost. Labor costs for professional contractors contribute to these costs. It costs $4400 to $9000 to spray foam a 24x30’ garage. We will highlight the cost to insulate a garage ceiling and wall with their recommended R-value.
Cost to Insulate Garage Walls (R13-R21)
The cost to insulate a standard 3-car garage wall is $600 to $4000. The cost is majorly dependent on the type of spray foam used. Spray foam costs $1.5 to $3.5 per sq ft, and the average cost of garage wall insulation is $5000.
Cost To Insulate Garage Ceiling (R30-R40)
The cost to insulate a 3-car garage ceiling is $1000 to $5000. The labor cost for a 24x30’ garage is $2400 to $5000.
In this table, we provide a detailed cost range for insulating garages of various sizes using spray foam, breaking down the expenses for both wall and ceiling insulation based on their respective R-values:
How Much Does It Cost to Insulate a Garage with Spray Foam |
||||
|---|---|---|---|---|
| 12x20’ (1-car Garage) | 20’x20’ (2-car Garage) | 24’x24’ (2-car Garage) | 24’x30’ (3-car Garage) | |
| Walls (R13 - R21) |
$350 - $1500 | $400 - $2000 | $500 - $3000 | $600 - $4000 |
| Ceiling (R30- R40) |
$500 - $2500 | $700 - $4000 | $800 - $4200 | $1000 - $5000 |
| Garage Insulation Cost (Spray foam) | $1500 - $5000 | $2000 - $6000 | $3000 - $8000 | $4000 - $15000 |
* Cost estimates calculated using the SPRAYMAN Spray Foam Insulation Calculator and additional data sourced from HomeGuide.
What Is the Cost to Insulate a Garage Attic?
The average cost to insulate the garage attic is $5000. The cost of insulating a garage attic varies with the choice of materials and size of the attic. Spray foam insulation costs $2000 - $4000 for a 2-car garage attic insulation.
Garage attic insulation is just as important as garage ceiling insulation. They both require an R-value of R30- R40. Garage attic insulation is essential when your home’s HVAC system extends to the garage. Attic insulation helps to maintain a stable temperature in the garage.
What Is the Cost to Insulate Garage Door
Adding insulation in a garage door costs between $500 - $6000. The cost varies with the insulation type installed, R-value, and garage door size. When it comes to garage door insulation, you can buy a ready-made insulated one or install the insulation on a non-insulated one.
The cost of insulated doors is $700 - $8000, depending on the brand and style.
The cost of spray foam for garage door is between $200 - $1000. This depends largely on the type of insulation used and the size of the garage door.
Spray foam insulation is the best insulation for any garage door insulation. For instance, insulating a 1-car garage door with a dimension of 9’x7’ and R-value of R8-R12 is $200 - $350. Insulating a 2-car garage door will cost $350 -$600. Lastly, insulating a 3-car garage door costs between $420 - $1000.
What Are the Costs of Installing Drywall and Insulation for Garages?
The cost to drywall garage is $500 to $5000. Drywall installation cost is influenced by garage size, finish level, labor, and material used. The bigger the garage, the higher the cost of drywall installation. For a 1-car garage, the cost to drywall is $500 to $2500.
Drywall installation adds aesthetics to your garage and additional protection against fire. Homeowners are often concerned about the cost of adding insulation and drywall in their garage. The cost to drywall and insulate garage using spray foam is $2000 - $16000. For example, the cost to drywall and insulate a 2-car garage is $3000 - $10000.
This table outlines the costs associated with drywall installation and combined drywall and spray foam insulation for different garage sizes, offering a clear comparison between these options:
| Cost to Drywall Garage | Cost to Install Drywall and Insulate Garage | |
| 1-car Garage | $500 - $2500 | $2000 - $7500 |
| 2-car Garage | $1000 - $4000 | $3000 - $10000 |
| 3-car Garage | $1500 - $5000 | $5500 - $16000 |
* Cost ranges for drywall based on various industry sources.
How Do DIY Costs Compare to Professional Costs?
The average cost for DIY garage insulation is $0.5 to $3.5 per sq ft depending on the type of insulating material used. This cost is just for the materials and DIY insulation kits. For instance, the DIY cost of insulating a 2-car garage with 400 sq ft is $200 to $1500.
DIY spray foam insulation cost eliminates the cost of hiring professional contractors. It is the cheapest way to insulate garage. The secret to achieving successful DIY insulation is using the best DIY spray foam insulation kits.
Labor cost estimates based on calculations from HomeGuide:
| Garage Size | Labor Cost for Walls (R13-R21) |
Labor Cost for Ceiling (R30-R40) |
Total Labor Cost Range |
| 1-Car Garage (12'x20') | $500 - $1,500 | $600 - $2,000 | $1,100 - $3,500 |
| 2-Car Garage (20'x20') | $1,000 - $3,000 | $1,200 - $4,000 | $2,200 - $7,000 |
| 2-Car Garage (24'x24') | $1,500 - $3,500 | $1,800 - $4,200 | $3,300 - $7,700 |
| 3-Car Garage (24'x30') | $2,000 - $4,000 | $2,400 - $5,000 | $4,400 - $9,000 |
How to Reduce Costs When Insulating Your Garage with Spray Foam?
Many homeowners complain about the high cost of installing spray foam. The total cost can fall on the higher end of the price range depending on the labor cost, R-value, negotiation power, and complexity. However, spray foam insulation is the best way to protect your garage from unfavorable weather conditions. As a homeowner, there are a few ways to reduce the cost of spray foam insulation garage.
- Negotiate with Multiple Contractors: Speak to credible spray foam contractors and choose the best quote for your budget.
- Use the Right Spray Foam Product: The secret to successful garage insulation is using the right spray foam product. If you are hiring a professional, ask for details about the spray foam product.
- DIY Where Possible: If you're comfortable taking on some of the work, consider a DIY approach for less complex areas like garage walls. This can significantly reduce labor costs.
- Insulate Important Areas First: Prioritize insulating key areas such as garage walls, ceilings, and doors that contribute most to energy efficiency. You can add insulation to other areas like the garage floor or attic later as your budget allows.
- Take Advantage of Tax Credits: Look into available tax credits or rebates for energy-efficient home improvements, which can help offset the cost of insulation.
- Replace Windows for Better Air Sealing: If your garage has windows, consider replacing them with energy-efficient models. This can enhance the air-sealing effectiveness of your spray foam insulation and reduce heating or cooling costs.
- Healthy Garage Habits: It is important always to practice healthy garage habits. One, avoid keeping the garage door open for a long period. This helps to reduce the workload on the HVAC system.
FAQs
Is Spray Foam Insulation Good for Garage?
Yes, spray foam insulation is an excellent choice for garages. It creates an airtight seal, improves energy efficiency, and extends the life of your car battery by maintaining a stable temperature. For DIY enthusiasts, following a comprehensive spray foam garage insulation guide can help save money on installation.
Is It Economical for Contractors to Use Spray Foam Insulation in a Can?
Yes, it can be economical for contractors to use spray foam insulation in a can, especially with products like Sprayman, which offer affordability and ease of use. These products eliminate the need for expensive machinery and reduce setup time, allowing contractors to increase efficiency and profit. However, spray foam in a can is best suited for small projects.
How to Insulate a Garage?
To insulate a garage effectively, you should choose the right materials, prepare the space, and follow a step-by-step process. For a detailed guide, including specific steps and best practices, refer to our DIY Guide for Spray Foam Garage Insulation.
How Much Does Spray Foam Insulation Cost for a Whole House?
On average, spray foam insulation costs $6000 for a standard house. It costs $0.5 to $2.5 per square foot. Nevertheless, there are a number of factors that affect spray foam insulation cost.
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