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How Much Does Spray Foam Insulation Cost?

Typical Range: $1,283 - $3,748

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Reviewed & Approved on July 17, 2020 by Cati O'Keefe, Expert Home Building & Sustainability Contributor.

Written by HomeAdvisor.

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 $2,489, or between $1,283 and $3,748. 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 underside of the roof.

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National Average $2,489
Typical Range $1,283 - $3,748
Low End - High End $600 - $6,800

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Cost data is based on actual project costs as reported by 2,987 HomeAdvisor members in .

Foam Insulation Costs

Average Cost$2,489
Typical Range$1,283 and $3,748
Low Cost$600
High Cost$6,500

Spray-In Insulation Costs by Type

Foam typeMaterials per board footInstallation per square foot
Open cell$0.44 - $0.65$1.50 - $4.90
Closed cell$1.00 - $1.50$1.50 - $4.90
the average cost to install spray foam insulation is $1.50 to $4.90 per square foot

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.

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.

Get Quotes from Local Spray Foam Installers For the Best Price

Where to Use Spray Foam Insulation

"One advantage spray foam has over other insulation types is that it is an air sealant, which means a more comfortable indoor environment, free from drafts and hot or cold spots."Cati O'Keefe, Expert Home Building & Sustainability Contributor.

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. 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.

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 roofing 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. Rim joists, also called band joists, secure the ends of floor joists. 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.


Insulating the walls of an 18 by 20 foot garage will cost between $335 and $1,140 for spray foam materials. If you insulate your garage walls, it’s important to insulate your garage door as well, including weatherstripping the bottom edge of the garage door and installing polystyrene panels on the back side of the garage door.

Pole Barns or Other Detached Outbuilding

Materials cost from $740 to $2,540 to insulate a 30 by 40 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, and can apply the spray foam while the walls, crawl spaces and roof deck are easily accessible. When working in older homes, pros need to work around existing insulation, drywall and structures, which costs more in time and money. Instead, perform weatherization or hire an energy auditor for existing homes to help pinpoint exactly where you need to beef up your insulation.

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Spray Foam Insulation Prices by Location

Location Average Cost
Minneapolis, MN$1,870
Atlanta, GA$3,410
Chicago, IL$1,780
Houston, TX$2,501
Trenton, NJ$2,980
Phoenix, AZ$2,240
Austin, TX$2,840
Los Angeles, CA$1,700
New York, NY$2,560
Denver, CO$2,340
Portland, OR$2,440
Philadelphia, PA$1,900

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 thickness (inches)Cost per square foot
1”$0.44 - $1.50
2”$0.88 - $3.00
3”$1.32 - $4.50

$1.76 - $6.00

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

Spray Foam:

  • $2,360 on average
  • R-value of 6-7 per inch (closed cell) and 3.5-3.6 per inch (open cell)
  • Highest R-value insulator
  • Provides air sealing in addition to insulation

Blown-In Insulation:

  • $1,440 on average
  • R-value of 3.1-3.4 per inch (fiberglass) and 3.2-3.7 per inch (cellulous)
  • Some products offer recycled content

Fiberglass Batts:

  • $300 to $600 on average to install
  • R-value of 2.9-3.8 per inch
  • Quick to install; easy DIY project
  • Can improve energy efficiency by up to 30 percent

Rock Wool:

  • $1,000 on average to install
  • R-value of 3.0-3.3 per inch
  • Offers fire resistance and sound deadening
  • Quick to install; easy DIY project
Get the Most Out of Your Energy Bill. Install Spray Foam Insulation.

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.

R-Value is 3.5-3.6 per inchR-value is 6-7 per inch
Less denseDenser
Less expensiveMore expensive
Expands a lotDoes not expand much
Weak moisture barrierStrong moisture barrier
Great for soundproofingGreat for soundproofing
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 your pro uses and verify its appropriateness for your job with the manufacturer. And don’t forget to ask for

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 of recommended insulation levels for retrofitting existing wood-framed buildings in the United States. It can help you weigh R-value relative to cost effectiveness.

Pros & Cons

Advantages of Foam Insulation

  • Helps lower utility costs
  • Insulates 50% better than traditional products
  • Provides air sealing for a more comfortable home
  • Protects against moisture
  • Works well for noise reduction


  • 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.

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:

  • Walltite
  • Icynene
  • 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:

  • Touch 'n Foam
  • FOAM iT
  • Handi-Foam
  • Touch ‘n Seal
  • Tiger Foam
  • FomoFoam
  • Foam It Green


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

It costs approximately $1,500 to $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, air seals 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 foam.

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