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How Much Does Spray Foam Insulation Cost?

Typical Range: $1,273 - $3,650

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Cost of Spray Foam Insulation

Spray foam is available in two types: open-cell spray foam which usually costs $0.44 to $0.65 per board foot and closed-cell spray foam which averages $1 to $1.50 per board foot. The average total cost to have spray foam professionally installed is about $2,367. Spray foam insulation works as alternative to traditional fiberglass insulation during construction or planning for construction. Pros spray this expandable foam substance in wall cavities or on the roof.

On This Page:

  1. Spray Foam Insulation Cost Calculator
  2. Average Foam Insulation Costs
  3. Spray-In Insulation Price by Type
  4. Spray Foam Insulation Cost Per Square Foot
  5. Where to Use Spray Foam Insulation
    1. Attic
    2. Basement
    3. Crawl Space
    4. Roof
    5. Rim Joists
    6. Garage
    7. Barn or Outbuilding
  6. Cost for New vs. Existing Homes
  7. Spray Foam Price by City
  8. Polyurethane Foam Installation Cost Factors
    1. Injection Foam Insulation Cost by Thickness
    2. How Much Do You Need?
  9. Types of Spray Foam Insulation
    1. Open & Closed-Cell Insulation Costs
  10. R-Value and Thermal Resistance
  11. Pros & Cons of Foam Insulation
  12. DIY or Hire a Spray Foam Installer
  13. FAQ

Spray Foam Insulation Cost Calculator

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National Average
$2,367
Typical Range
$1,273 - $3,650
Low End - High End
$600 - $6,450

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Cost data is based on actual project costs as reported by 2,408 HomeAdvisor members in .

Foam Insulation Costs

Average Cost$2,360
Typical Range$1,270 and $3,643
Low$600
High$6,400

Spray-In Insulation Costs by Type

The cost of spray foam installed is pricier than spray foam material costs. This is due to the extra cost to hire a spray foam installer. The price of labor typically includes setup, prep, trash removal, and cleanup as well as the actual job. The cost per square foot for professional installation changes depending on the thickness of the insulation – thicker foam takes more work and costs more. Pros can choose to set prices by the square foot, hour or overall job.  

Foam typeMaterials per board footInstallation per square foot
Open cell$0.44-$0.65 $1.50-$4.90  
Closed cell$1-$1.50$1.50-$4.90
Get Quotes from Local Spray Foam Installers For the Best Price

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Spray Foam Insulation Cost Per Square Foot

Spray foam insulation costs $0.44 to $1.50 per board foot. A board foot is one square foot that is one-inch thick, or one square foot that’s covered by one-inch of spray foam insulation. Expanding foam insulation costs from about $0.50 to $2.50 per square foot. The cost of spray foam insulation per square foot is more difficult to pin down since the thickness of the foam is not specified.  

Cost of Materials by Size in Square Feet
Size in Square Feet Price*
100$44-$150
200$88-$300
300$132-$450
400$176-$600
500$220-$750
1,000$440-$1,500
1,500$660-$2,250
2,000$880-$3,000
2,500$1,100-$3,750
3,000$1,320-$4,500

*All costs assume a one inch foam thickness. Multiply price by additional inches as needed for the best estimate.

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Where to Use Spray Foam Insulation

You can install spray foam insulation in several places throughout the home for an effective air barrier. Closed cell foam can also act as a vapor barrier at the proper depth. Here are a few areas that benefit from spray foam insulation:

  • Crawl spaces and basements
  • HVAC*
  • Electrical and gas penetrations
  • Areas where siding and foundation meet
  • Wall joints in the garage ceiling
  • Around exterior faucets and vents
  • Stone wall repair
  • Water feature fillers
  • Securing block walls in the landscape

*Insulating around HVAC pipes, condensers, floor registers and ductwork optimizes your heating and cooling system.

Spray Foam Attic Insulation Cost

The cost to insulate an attic with spray foam is around $2,200. Contact an attic insulation contractor to see if you can add insulation to the ceiling as well as the walls for extra protection. 

Expanding Foam for Basement Walls Price

Installing expanding foam in the walls of a 1,000 square foot basement costs about $2,140 before labor. Spray foam basement insulation helps prevent mold.

Polyurethane Foam Insulation in Crawl Spaces

Adding polyurethane foam insulation under a house or in a crawl space costs about $80 before labor. Areas larger than a 2x10 space will cost more. 

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Spray Roof Insulation

The average cost to insulate a roof with spray foam is about $1,650 before labor. Closed-cell insulation works best on most roofs. Ask a pro to see which material is ideal for your space.

Rim Joists

Spray foam is an ideal choice to insulate rim joists and seal cracks. The price of this project varies depending on how many rim joists are in your home, although it will cost much less than large projects like insulating an attic or basement.

Garages

Insulating the walls of an 18x20 foot garage will cost between $335 and $1,140 for spray foam materials. This cost could be lower if you choose not to insulate your garage door.

Pole Barns or Other Detached Outbuilding

Materials cost from $740 to $2,540 to insulate a 30x40 foot pole barn with 12-foot ceilings using spray foam. Spray foam insulation on a metal building can improve R-value.

Difference in Cost for New or Existing Homes

Installing foam insulation in a new home costs much less than doing the same in an older home. New homes are easier because installation companies can design the insulation for optimum soundproofing, heat transfer and utility costs. When working in older homes, pros need to work around existing insulation and structures which costs more time and money. Instead, perform weatherization or hire an energy auditor for existing homes.

Compare Quotes from Spray Foam Installers Near You

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Spray Foam Insulation Prices by Location

Location Average Cost
Minneapolis, Minnesota$1,870
Atlanta, Georgia$3,410
Chicago, Illinois$1,780
Houston, Texas$2,501
Trenton, New Jersey$2,980
Phoenix, Arizona$2,240
Austin, Texas$2,840
Los Angeles, California$1,700
New York, New York$2,560
Denver, Colorado$2,340
Portland, Oregon$2,440
Philadelphia, Pennsylvania$1,900

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Polyurethane Foam Installation Cost Factors

Polyurethane foam installation cost varies depending on several factors, including the thickness and type of the foam, the square footage of the project, debris disposal, and the age of the home. Here’s a quick breakdown of different cost factors.

Injection Foam Insulation Costs by Thickness

Foam thicknessCost per square foot
1”$0.44-$1.50
2”$0.88-$3.00
3”$1.32-$4.50 
4”

$1.76-$6.00

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How Much Spray Foam Insulation Do You Need?

The amount of spray foam insulation required varies from home to home. Homes in climates with extreme weather fluctuations require thicker insulation with a higher R-Value.

Spray Foam Costs vs. Fiberglass, Batt & Cellulous Here is an overview of the differences between distinct kinds of insulation.   Blown-In Insulation:

  • $1,440 on average
  • R-value up to about 4 per inch
  • Typically made of fiberglass and cellulose

Spray Foam:

  • $2,360 on average
  • R-value up to about 6 per inch
  • Highest R-value insulator
  • Comes in open- or closed-cell

Fiberglass Batts:

  • $170 to $420 to install
  • Quick to install
  • Can improve energy efficiency by up to 30 percent

Cellulous:

  • $1,000 on average to install
  • Has a higher R-value than fiberglass
  • Made from recycled materials
Get the Most Out of Your Energy Bill. Install Spray Foam Insulation.

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Types of Spray Foam Insulation

You can choose from open-cell or closed-cell spray foam insulation. An insulation contractor can help you make the right decision based on the purpose and placement of the foam. Here is a quick breakdown of the two kinds:

Open-Cell vs. Closed-Cell Foam Insulation

Open-cell (or half-pound) foam is ideal for nooks and crannies inside a home. Closed-cell (or two-pound foam) works best for exposed or exterior walls and extreme climates.

Open-CellClosed-Cell
R-Value is 3.5-3.6 per inchR-value is 6-6.5 per inch
Less denseDenser
Less expensiveMore expensive
Expands a lotDoes not expand much
Weak moisture barrierStrong moisture barrier
Great for soundproofingExtremely sturdy
Needs vapor retarderHas vapor retarder
Not ideal for roof sheathingGreat for roof sheathing

Tip: It’s a good idea to establish the brand of foam and verify it with the manufacturer before hiring a pro. And don’t forget to ask for ESR reports and MSDS sheets on all products. Need pricing info on spray foam insulation? Contact a pro today.

R-Value: Thermal Resistance

R-Value measures how well insulation can resist temperature, with higher numbers showing a higher resistance. This is an important measurement to keep in mind for your insulation project. However, heat gain and loss can occur in many ways, so keep these other mechanisms in mind when deciding on insulation:

  • Conduction
  • Convection
  • Radiation
  • Air infiltration
  • Air intrusion
  • Moisture accumulation

Spray polyurethane foam effectively prevents all six of these heat transfer methods from occurring. If you're uncertain about installing spray foam insulation, Energy Star has a map that recommends levels of insulation by R-value and cost-effectiveness in the United States.

Pros & Cons

Advantages of Foam Insulation

  • Helps lower utility costs
  • Insulates 50 percent better than traditional products
  • Protects against moisture
  • Works well for noise reduction

Disadvantages

  • Higher upfront cost than traditional insulation
  • May take longer to install than conventional products
  • Can cause eye, skin, gastrointestinal or respiratory irritation*
  • Linked to a condition called hypersensitivity pneumonitis

*Most quality spray foam manufactures have addressed health issues associated with isocyanates. Side effects are less common than in the past. An insulation contractor can address any questions you may have. 

Save Yourself the Mess. Hire a Local Spray Foam Insulation Pro.

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DIY vs. Hiring Professional Spray Foam Insulation Contractors

DIY spray foam insulation projects are possible in small areas or uncomplicated, flat surfaces. But for large areas or more difficult to reach projects, talk to a pro.

Foam Brands

Here are a few top foam manufacturers in the United States:  

  • USA
  • Walltite
  • Lcynene
  • Retrofoam
  • Lapolla Industries
  • Demilec
  • Johns Manville

DIY Foam Insulation Kits & Costs

The average price to cover 200 square feet with a foam insulation kit is between $300 and $600. Covering this area uses about two to three kits. It’s difficult for inexperienced installers to spread foam evenly over a surface, so DIY kits are best for smaller projects. Larger areas, like the attic, basement or garage, should be left to pros. If you choose to install foam insulation on your own, you can choose from various brands including:

  • GREAT Stuff (PRO)
  • Touch 'n Foam
  • FOAM IT
  • Handi-Foam
  • Touch N Seal
  • Tiger Foam
  • FomoFoam
  • Foam It Green

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FAQ

How much does it cost to insulate a 1,500 square foot house with spray foam?

It costs between $1,500 and $2,250 to cover 1,500 square feet with one inch of closed-cell spray foam insulation. Labor costs and thickness add to this total. This value may also change depending on the number of walls in a home.

How much to spray a 30x50 metal building with closed cell foam?

You’ll pay from $1,600 to $2,400 to cover the walls of a 30x50 metal building with one inch of closed-cell foam. Expect to pay more in labor costs if you hire a pro for this job.

How expensive is spray foam insulation?

Expanding foam insulation runs from $0.44 to $1.50 per board foot, with open-cell foam being less expensive and closed-cell foam costing more. Spray foam insulation is more expensive than fiberglass.

Is spray foam insulation worth the cost?

Spray foam insulation is worth the cost to many homeowners because it is energy efficient, protects against moisture and can even add structural integrity to your home.

What is the R value of 2 inches of spray foam?

The R value of 2 inches of spray foam runs from 7 to 13 depending on the type of material. Open-cell foam has a lower R value than closed-cell.  

Still Have Spray Foam Insulation Questions? Ask a Local Pro.

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