Spray foam insulation costs between $1.80 and $4.50 per square foot, on average. That means that insulating a 1,000-square-foot area in your home will cost you between $1,800 and $4,500.
Spray foam insulation differs from traditional fiberglass blankets, batts, and rolls in that it is applied with a sprayer and expands to fill cavities, air-sealing the home more completely.
For this guide, we gathered data from big and small cities across the U.S. to give you an accurate estimate. Your final cost will depend on a few factors, such as type, location, and material.
Cost by Location
In extreme cold and hot climates, a home generally requires more insulation to maintain energy efficiency and effectively heat and cool your home. Expect costs to rise if average temperatures in your area tend to be very hot or very cold.
Moreover, costs will rise the higher the living costs are in your city. Generally speaking, bigger cities have higher labor costs than smaller or rural towns.
Let’s take a look at this snapshot of the costs to insulate your home with spray foam across the country:
| City | Cost per square foot (including labor and materials) |
| Northeast U.S. | |
| Pawtucket, RI | $1.80 – $4.50 |
| New York, NY | $1.90 – $4.90 |
| Southeast U.S. | |
| Dothan, AL | $1.70 – $4.20 |
| Atlanta, GA | $1.70 – $4.30 |
| Midwest U.S. | |
| South Bend, IN | $1.80 – $4.50 |
| Chicago, IL | $1.90 – $4.70 |
| Northwest U.S. | |
| Corvallis, OR | $1.80 – $4.40 |
| Seattle, WA | $1.90 – $4.80 |
| Southwest U.S. | |
| Roswell, NM | $1.70 – $4.30 |
| San Diego, CA | $1.80 – $4.60 |
Cost Estimator by Type
When estimating the costs of spray foam insulation, one of the things you need to pay attention to is R-values. R-values tell you how well an insulating material can prevent heat loss by regulating the flow of air in and out of your home. The higher the R-value, the better a material will insulate your entire home.
There are two types of spray foam insulation, open-cell and closed-cell, with closed-cell being denser and offering better insulation (higher R-value). Open-cell is the less expensive option but has a lower R-value than closed-cell insulation.
Here are the average costs of each type of spray foam insulation:
| Type | Cost per Board Foot | R-value |
| Open-cell spray foam | $0.75 to $2.50 | 3.5 to 3.7 |
| Closed-cell spray foam | $1.60 to $4.60 | 5 to 7 |
Cost by Area Size
Spray foam application ranges from $1.80 to $4.50 per square foot. You can use the table below to estimate your project’s costs based on the size of the area you need to be insulated:
| Area Size (In Square Feet) | Average Cost (Installation included) |
| 100 | $180 – $450 |
| 300 | $540 – $1,350 |
| 500 | $900 – $2,250 |
| 700 | $1,260 – $3,150 |
| 1,000 | $1,800 – $4,500 |
| 2,000 | $3,600 – $9,000 |
| 3,000 | $5,400 – $13,500 |
Cost by Household Area
Homeowners will often undertake home improvement insulation projects for one particular area of the home at a time. The average costs for insulating different areas of the home are given below:
| Household Area | Average Cost (Installation included) |
| Crawl space | $1,280 – $5,920 |
| Roof | $1,950 – $7,500 |
| Rim joists | $2,000 – $2,400 |
| Attic | $2,040 – $10,000 |
| Basement | $2,060 – $7,560 |
| HVAC | $2,125 – $3,100 |
| Garage | $2,440 – $8,700 |
| Entire home | $7,000 – $27,250 |
- Crawl space: Crawl spaces are often left uninsulated by general contractors and builders. To add spray foam insulation to a crawl space, you can expect to pay more.
- Roof: Roof insulation is not included in estimates for the attic, as the roof is considered a separate area of the home.
- Rim joists: These help secure the ends of floor joists, and insulating them can help make your home warmer and seal cracks.
- Attic: Most homeowners have attic insulation to manage the temperature inside their homes. They may need to add insulation to a new home addition or replace insulation following a fire or rodent infestation.
- Basement: Contractors and builders will sometimes avoid insulating the basement to save on costs, but basements are often cold and damp, needing insulation.
- HVAC: Insulating HVAC systems is a good idea if there isn’t any duct liner insulation in place. Spray foam insulation around pippin can help seal air leaks and improve efficiency.
- Garage: Again, builders and contractors often refrain from insulating garages to increase profits. Homeowners who would like their garage walls, ceiling, and doors insulated with spray foam can expect costs to rise.
- Entire home: Applying spray foam insulation to your entire home will cost you considerably, especially if it’s a new build with no existing insulation.
Cost by Spray Foam Material
A variety of spray foam insulations are available. You can choose based on their energy efficiency, environmental impact, and material cost goals. Certain materials may prove better suited for different projects and locations within the home.
| Type of Spray Foam | Average Cost |
| Polyurethane | $0.45 – $1.50 |
| Water-based | $0.50 – $2.50 |
| Soybean | $1.50 – $3 |
| Vegetable oil | $1.50 – $3 |
- Polyurethane: Polyurethane foam insulation is the most common spray foam type available on the market. It is one of the most cost-effective options, but homeowners interested in environmental impact may wish to choose one of the other available options.
- Soybean: Soybean-based spray foam insulation is considered a more environmentally friendly option.
- Vegetable oil: Similar to soybean-based spray foam, vegetable oil-based spray foam insulation is considered environmentally friendly but is not readily available.
- Water-based: A newer option, water-based spray foam insulation is the best for the environment. However, some of the durability and efficiency of oil-based insulations are negated by water-based spray foam.
Cost of Labor
Labor accounts for the majority of the cost to apply spray foam insulation, at around $0.45 to $2.65 per square foot, or $50 to $100 per hour. These rates vary depending on where you live, the time of year, and the complexity of the installation.
Pro Cost vs. DIY Cost
There are DIY kits available for spray foam insulation that cost around $315 to $500. In most cases, it is easier to attempt these installations during new builds before electricity, drywall, and finishing are complete.
Homeowners looking to save on DIY spray foam insulation should opt for open-cell spray foam insulation kits, as closed-cell foam insulation will have a considerable markup.
It should be noted that spray foam insulation needs to be applied in thin layers in order to avoid expansion beyond the studs or a sagging final product that needs to be cleaned up after the fact. If homeowners are not confident in their ability to apply foam minimally in layers, they should not attempt this themselves and call a pro instead.
Other Cost Factors To Consider
When considering spray foam insulation, here are a few other factors to consider for your budget:
Thickness
Spray foam can range in thickness from 1 to 10 inches. Thicker applications of spray foam typically result in improved energy efficiency and higher R-values, but also higher costs. The thinner the layer, the less you’ll spend.
Spray foam starts at $0.50 per square foot for a 1-inch layer, and prices increase exponentially as the layer thickness increases.
New Construction vs. Existing Installs
New construction allows installers to access areas of the home that may not be available in existing homes, so costs are usually lower. Homeowners installing insulation in an existing home need to consider the removal of old insulation, accessibility to different areas of the home, working around the electrical conduit, and pest control.
Removal of Old Insulation
If your insulation is too old, has moisture issues, or if you’ve had fire damage or a pest problem, it may be necessary to replace the old insulation with new.
Homeowners should budget an additional $1.20 to $2.60 per square foot for the removal of old insulation.
Ways to Save on Spray Foam Insulation
There are plenty of ways to lower the cost of spray foam insulation, but keep in mind that some savings in installation may come with reduced energy efficiency. It’s important to strike a balance between upfront savings and long-term performance when deciding how and when to cut costs:
- Choose open-cell spray foam: Open-cell foam costs less than closed-cell foam, but at a lower R-value.
- Insulate smaller areas at a time: Instead of insulating your entire home at once, focus on one section, like the attic or crawl space, and apply the rest over time.
- Pick polyurethane foam: This is typically the most cost-effective spray foam material.
- Avoid foam that is too thick: Prices rise with every additional inch of foam.
- Remove the old insulation yourself: Clearing out existing insulation before the pros arrive can save on labor charges.
- Book installation during the off-season: This can help you take advantage of lower contractor rates.
FAQ
Spray foam insulation is worth the cost to most homeowners because it is more energy efficient than other insulation methods, expands to seal wall cavities and fill gaps, is moisture-resistant, and can even enhance the home’s structural integrity.
It is recommended that you stay out of the area for 24 hours after applying spray foam insulation to allow time for the insulation to cure and for lingering chemicals to leave the space naturally.
Do not use spray foam around electrical outlets or lighting, as this may create fire hazards. Avoid open flames, as chemicals used in the application process before full cure can be highly flammable. And finally, remember that spray foam insulation expands, so do not use it in areas where it might interfere with the home’s structural integrity.
Ready to Seal the Deal?
Spray foam insulation can be one of the smartest upgrades for improving your home’s comfort and energy efficiency.
If you’re ready to make your home comfortable, Home Gnome delivers the best home service experience at the click of a button. Book reliable, skilled services and leave the rest to us.
Read More:
– How to Insulate Pipes in Your House
– How Much Does Attic Insulation Cost?
– How Much Does Blown-In Insulation Cost?
– How Much Does Batt and Roll Insulation Cost?
Main Image: A contractor in a white suit and respirator applies spray foam insulation to the underside of a sloped attic roof. Photo Credit: ctvvelve / Adobe Stock
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