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How Much Does It Cost To Insulate A Garage?

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Key Takeaways

Key PointsDetails
Average Cost per Square Foot$0.50 – $3.00
2-Car Garage (Walls + Ceiling)$800 – $5,100
Existing 2-Car Garage Door$90 – $530
New Insulated Garage Door$1,500 – $3,700

Average Cost To Insulate A Garage

Insulating your garage is a critical step to enhance energy efficiency and comfort. Below is a detailed table outlining costs based on various garage sizes and components.

Cost To Insulate A Garage

Garage SizeWalls OnlyWalls & CeilingWalls, Ceiling, & Door
1-car garage (12×24)$350 – $2,000$500 – $2,900$600 – $3,200
2-car garage (24×24)$500 – $3,100$800 – $5,100$900 – $5,600
3-car garage (24×36)$600 – $3,600$1,000 – $6,200$1,100 – $7,100

Cost To Insulate An Unfinished Vs. Finished Garage

The cost will vary depending on whether your garage is finished or unfinished. Insulating an unfinished garage is simpler and less costly compared to insulating and finishing a garage.

Cost To Insulate An Unfinished Vs. Finished Garage

Project TypeCost To Insulate 2-Car Garage (Walls & Ceiling)
Insulate an unfinished garage$800 – $5,100
Insulate and drywall an unfinished garage$1,800 – $9,000
Insulate a finished garage$1,600 – $12,800

Cost Of Insulating A Garage Ceiling

Different types of insulation materials have different costs associated with insulating the garage ceiling.

Cost To Insulate A Garage Ceiling

Insulation TypeAverage Cost To Insulate Garage Ceiling*
Batt and roll$250 – $2,200
Blown-in$300 – $2,400
Rigid foam$350 – $3,200
Spray foam$300 – $3,900
Reflective or radiant barrier$100 – $1,700

Cost To Insulate A Garage Door

Garage doors are significant in insulation projects. Options available include adding a DIY insulation kit to an existing door or replacing it entirely with a new insulated garage door.

Cost To Insulate A Garage Door

Garage Door SizeDIY Kit Cost To Add InsulationNew Insulated Garage Door Cost Installed
1-car garage$50 – $300$750 – $1,900
2-car garage$90 – $530$1,500 – $3,700+
3-car garage$130 – $890$2,250 – $5,800+

Garage Insulation Cost Per Square Foot By Type

The cost per square foot can vary greatly depending on the type of insulation used.

Garage Insulation Cost Per Square Foot

Insulation TypeCost Per Square Foot Installed*Average Cost Installed (2-Car Garage)*
Cavity batt and roll$0.80 – $2.60$1,500 – $5,300
Blown-in$1.00 – $2.80$1,400 – $4,600
Spray foam$1.00 – $4.50$4,100 – $11,900
Reflective or radiant barrier$0.30 – $2.00$500 – $3,200
Rigid foam board$1.20 – $3.70$1,900 – $5,900

Cost Of Spray Foam Insulation In Garage

Spray foam insulation stands out for its high R-value but comes with higher installation costs. The cost varies based on the type of spray foam used: open-cell or closed-cell.

Cost Breakdown Of Insulating A Garage

Understanding the breakdown of costs helps in estimating the total expense accurately for insulating a garage.

Garage Insulation Installation Cost Breakdown

FactorAverage Cost Per Square Foot
Remove old insulation*$1.00 – $2.00
Insulation material & supplies$0.20 – $1.30
Prep and installation labor$0.30 – $1.70

Total Cost To Replace: $1.50 – $5.00

R-Value For Garage Insulation

The R-value measures insulation’s thermal resistance. Higher R-values mean better insulation effectiveness. Below is the recommended R-value for different garage areas and suitable insulation options.

Garage Insulation R-Value

AreaRecommended R-ValueInsulation Options
Garage ceiling / attic floor30 – 60Blown-in, Spray foam, Blanket / batt and roll, Reflective insulation
Garage door6 – 14+Rigid foam board, Fiberglass garage door kit, Radiant barrier or reflective insulation, Polyurethane foam
Garage walls13 – 15Blanket / batt and roll, Rigid foam board, Blown-in Injection foam

Installing Garage Drywall

Installing drywall in your garage can also play a role in insulation. When adding insulation, it is often followed by installing drywall to encase the insulation materials.

Garage Insulation FAQs

What Is The Cheapest Way To Insulate A Garage?

The most cost-effective way to insulate a garage is by using fiberglass batts and rolls. It is a budget-friendly option that can often be installed as a DIY project.

What Is The Best Insulation For A Garage?

Selecting the best insulation depends on the specific conditions of your garage and your insulation goals. Here are the main types of insulation and their features:

Garage Insulation Types And Features

Insulation TypeCost Per Square Foot InstalledFeatures
Fiberglass batts and rolls$0.80 – $2.60
  • Best for an unfinished garage
  • Budget-friendly
  • Easy to install DIY

| Blown-in cellulose or fiberglass | $1.00 – $2.80 |

  • Best choice for a finished garage
  • Installs through small drywall holes or onto the garage ceiling or attic floor

| Spray foam | $1.00 – $4.50 |

  • Best for a conditioned garage
  • Expensive; requires professional installation
  • Mold, mildew, and pest resistant
  • Provides an air barrier and higher R-value per inch

| Rigid foam | $1.20 – $3.70 |

  • Best for thin walls and garage doors
  • Often includes a radiant barrier lining
  • High R-value per inch

| Radiant barrier | $0.30 – $2.00 |

  • Best paired with another insulation type
  • Ideal for warm climates; reflects heat away from home


Can You Insulate A Garage Without Drywall?

Yes, you can insulate a garage without drywall by using rigid foam or reflective radiant barriers. These materials can be applied directly to the surfaces of a garage, reducing the need for drywall installation.

How Much Insulation Do I Need For My Garage?

The amount of insulation needed depends on the size of your garage and the specific areas you want to insulate. Here’s a brief guide:

  1. Measure the Area: Calculate the square footage of the walls, ceiling, and doors.
  2. Choose Insulation Type: Determine the type of insulation suitable for each area.
  3. Calculate R-Value: Aim for the recommended R-values based on your climate.

Getting Estimates From Garage Insulation Contractors

Before hiring a contractor, obtaining multiple estimates is advisable. This will help you compare prices and services to choose the best option.

Questions To Ask Insulation Installers

When talking to potential contractors, ensure to ask the following questions:

  • Do you have experience insulating garages specifically?
  • Can you provide a detailed written estimate?
  • What type of insulation do you recommend for my garage?
  • How long will the insulation process take?
  • Do you offer any warranty or guarantee on the installation?

Insulating a garage is a worthwhile investment that can lead to significant energy savings and improved comfort. With this comprehensive cost guide, you are now better equipped to make informed decisions regarding your garage insulation project.

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