Attic insulation costs an average of $1.40 to $3.30 per square foot installed. That means that most homeowners shell out $2,100 to $4,875 to insulate a 1,500-square-foot attic.
The U.S. Environmental Protection Agency (EPA) estimates that homeowners can save an average of 15% on heating and cooling costs by improving insulation in spaces like attics. So, this could be the first step in helping you save some money in the long run.
This guide includes data from both small and large cities, so you can get a better estimate of the cost of this project in your area. Your final cost will depend on factors such as the type of insulation and the size of the space.
Cost by Location
Regional factors, such as climate, largely determine costs. For example, while reflective insulation is the cheapest option, it’s more suitable for warmer climates because it reflects radiant heat, keeping homes cooler on really hot days (rather than keeping them warm on cold days).
Because of that, homeowners in colder climates should either opt for more expensive insulation types or complement their reflective insulation with other kinds to stay cozy and comfortable. As a result, homeowners in colder regions will usually spend more than the national average on attic insulation.
Labor costs can also be driven up or down depending on the location of your home. The table below offers a snapshot of the cost to insulate your attic across the country:
| City | Cost per square foot (including labor and materials) |
| Northeast U.S. | |
| Pawtucket, RI | $1.39 – $3.23 |
| New York, NY | $1.50 – $3.40 |
| Southeast U.S. | |
| Dothan, AL | $1.33 – $3.15 |
| Atlanta, GA | $1.34 – $3.17 |
| Midwest U.S. | |
| South Bend, IN | $1.40 – $3.26 |
| Chicago, IL | $1.44 – $3.31 |
| Northwest U.S. | |
| Corvallis, OR | $1.37 – $3.21 |
| Seattle, WA | $1.46 – $3.33 |
| Southwest U.S. | |
| Roswell, NM | $1.34 – $3.17 |
| San Diego, CA | $1.42 – $3.27 |
Cost Estimator by Size
The bigger your attic is, the pricier the insulation. The national average cost for attic insulation ranges from $1.40 to $3.30 per square foot. Using these numbers, homeowners can start estimating how much they should set aside for their specific project.
Differences in price range will be more apparent as you go up and down the ladder of attic sizes and various insulation types.
| Attic Size | Average Cost (Including Installation) |
| 500 sq. ft. | $700 – $1,650 |
| 750 sq. ft. | $1,050 – $2,475 |
| 1,000 sq. ft. | $1,400 – $3,300 |
| 1,200 sq. ft. | $1,680 – $3,960 |
| 1,500 sq. ft. | $2,100 – $4,875 |
Cost by Insulation Type
There are different types of insulation that you can use in your attic, depending on your budget, the temperatures in your area, and your personal preferences.
At the two extreme ends of the cost spectrum are reflective insulation and structural insulated panels, each with its own advantages and drawbacks.
Let’s take a closer look at each one of them:
| Insulation Type | Average Cost Per Square Foot (Installed) |
| Reflective | $0.50 – $2 |
| Blown-in | $0.90 – $3.50 |
| Batt and roll | $1.60 – $3.50 |
| Loose-fill | $1.60 – $4.20 |
| Spray foam | $1.80 – $4.50 |
| Structural insulated panels | $4 – $8.60 |
Reflective
Reflective insulation is generally one of the least expensive types of insulation for your attic. This type of insulation is usually made from aluminum foil, aluminized polyester, or other materials. As the name suggests, it mainly reflects radiant heat to keep your house from getting too hot.
It is best suited for cooling a house in warmer climates. You would need to combine it with another insulation type in colder climates to keep your family from freezing during the winter.
Blown-In
Blown-in insulation is made out of either fiberglass, cellulose, or rock/mineral wool fiber and usually only takes a day to install. Fiberglass insulation lasts around 80 to 100 years, but needs checking for damage after 15 years.
Rock wool is roughly the same, moisture-resistant, and the least likely to require replacement. Eco-friendly cellulose insulation lasts only from 20 to 30 years since it’s made from recycled materials. It should be checked 15 years after installation.
See related: How Much Does Blown-In Insulation Cost?
Batt and Roll
Along with blown-in insulation, batt insulation is the most common type. Batts are usually made from fiberglass, cellulose, and even denim. They come in pre-sized panels (“batts”) and are fitted and held by paper or metallic facing.
Batts are usually reserved for large attic spaces and are sized to fit between joists on floors and ceilings. They don’t fit in tight spaces very well.
See related: How Much Does Batt and Roll Insulation Cost?
Loose-Fill
Loose-fill insulation is quite similar to blown-in insulation, but it is laid into the attic floor rather than blown into place. It can be made from cellulose, fiberglass, or mineral/rock wool. It’s often fluffy in texture and comes in a grayish-white color. It can conform to any space, making it a great option no matter what your attic looks like.
To people who currently have loose-fill insulation resembling gravel in their attic: Beware. It might contain asbestos, which can cause health issues when disturbed.
Spray Foam
Spray foam is a liquid insulation that expands and sticks to anything it touches, and it can be applied anywhere. It comes in two forms: open-cell and closed-cell, the first being cheaper, but less insulating.
This type of insulation is used by some to fill joist and rafter cavities and is great for insulating the underside of roof decks and other hard-to-reach places.
See related: How Much Does Spray Foam Insulation Cost?
Structural Insulated Panels
SIPs have layers of rigid foam, each connected to two layers of plywood or oriented strand board (OSB). They’re a bit pricey, but they’re noticeably stronger and more energy-efficient. They’re much larger than other types and are often best for new construction projects rather than existing attics.
While less commonly used to insulate attics, SIPs can be installed on roof decks or beneath rafters.
Cost of Labor
Contractors will usually charge you $0.90 to $2.80 per square foot for labor alone. This can, of course, be affected by various factors, such as the community where you reside and the insulation type the contractors have to work with.
Cost of Removal
Many homeowners already have previous insulation installed in their attics. If you’re looking to install new insulation, you’re either going to supplement the old or completely remove it. Removing old attic insulation will cost extra.
Insulation removal costs range from $1.20 to $2.60 per square foot.
Pro Cost vs. DIY Cost
If you want to stay on a budget and you’re handy with some DIY tasks, you can probably apply insulation to your attic yourself. It will cost you between $704 and $834 in tools and materials, including renting a blower machine, buying cellulose insulation, and vent chutes. The costs could be lower if you already have some of the tools at home.
However, if you’re not used to doing this type of work alone, it’s best to hire a professional. Applying insulation incorrectly can lead to sagging and other problems, which will hinder the insulation’s energy efficiency.
Ways to Save on Attic Insulation
Attic insulation doesn’t have to drain your budget. Here are a few tips on keeping your costs low while still improving your home’s comfort and energy efficiency:
- Choose a budget-friendly insulation type: If you live in a warm climate, reflective insulation can be an affordable option that helps block heat. In most other regions, blow-in insulation is one of the most cost-effective options.
- Handle some prep work yourself: Removing old insulation, sweeping up debris, and making the attic accessible can reduce the amount of time they spend on the job.
- Schedule work during the off-season: Contractors are usually busiest during peak weather months. Booking in late winter or early spring may help you secure better pricing.
FAQ
Each type of insulation has its own pros and cons, so there’s no clear-cut answer to this. What’s best is what works for your region’s climate, your budget, and the specific needs of your attic (or whatever area of the home you’re insulating).
However, blown-in, loose-fill, and spray foam are all great options for affordability. They also work well in all seasons and fit easily in almost any space.
It can take anywhere from five hours to two days, depending on the insulation type you plan to use. Some allow one day for attic preparation alone before the actual insulation installation.
Yes, but under-insulating is a more common problem. Too much insulation can lead to inadequate ventilation, poor air circulation, and other problems. You could either trap heat or accumulate mold in the process.
A Warmer Home Starts Up Top
Insulating your attic can go a long way toward improving your home’s comfort and saving you hard-earned money on your utility bills. Luckily, Home Gnome delivers the best home service experience at the click of a button. Book reliable, skilled services in seconds and leave the rest to us.
Read More: How to Insulate Pipes in Your House
Main Image: Worker installing insulation in attic. Image Credit: brizmaker / Adobe Stock
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