How Much Does Attic Insulation Cost?

Updated October 23, 2026

If your home feels a bit breezy on cooler nights or slightly warm when you've got the air conditioner on full blast, you may need new attic insulation. Average attic insulation costs are about $2,500 (CAD 3,452), but there are several factors to consider when it comes to total final pricing.

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What Is the Average Price to Install Attic Insulation?

According to data from Bob Vila, the national average for attic insulation is approximately $2,500 (CAD 3,452), with a typical price range of $1,500 to $3,500 (CAD 2,071 to CAD 4,833) and an extreme range of $500 to $10,500 (CAD 690 to CAD 14,497). Factors like home size and the scope of the job may affect your final costs.

What Types of Attic Insulation Are Available — and How Much Do They Cost?

Many types of attic insulation are available, and the type you choose depends on your specific heating and cooling needs. Here's a look at some of the different insulation types and associated per-square-foot costs.

Reflective Insulation

Commonly used in warm climates, this insulation directs heat away from your home, with average costs falling between $0.50 and $1.50 (CAD 0.69 to CAD 2.07) per square foot.

Fiberglass Insulation

Also called batt/roll insulation, fiberglass insulation consists of pre-cut blankets that fit between exposed ceiling beams and rafters. On average, fiberglass insulation costs between $2 and $4 (CAD 2.76 to CAD 5.52)

Loose-Fill or Blown-In Insulation

Sometimes referred to as cellulose or mineral wool, loose-fill insulation is applied by pouring or blowing the loose material into the attic. The average cost for loose fill is between $2 and $5 (CAD 2.76 to CAD 6.90).

Additional Cost Factors

These are average costs, and many factors can lead to higher or lower pricing. For example, if your heating and cooling technicians need to remove your old insulation before installation, this may add up to $1.50 (CAD 2.07) extra per square foot.

What Factors Affect Attic Insulation Costs?

Factors that can affect attic insulation costs include material types and thicknesses, the overall square footage of your home, and the complexity of the installation job. For instance, loose fill cellulose attic insulation generally costs more than fiberglass, and the specific thickness (thermal resistance) of each application can also impact pricing.

What R-Value Does an Attic Need?

A thermal resistance value (R-value) is a specific number that indicates the thickness, in inches, of insulation material. Insulation material and thickness are based on its climate zone. Climate zones range between 1 and 8, with warmer climates at the lower end and colder climates at the higher end. For example, if you live in a warmer climate that falls in a lower climate zone, your attic will require a lower R-value (insulation material thickness). Here's a breakdown of the main climate zones and location examples.

• Zone 1: Very hot areas (Florida, Hawaii)

• Zone 2: Hot areas (Texas, California)

• Zone 3: Warm areas (Central Alabama)

• Zone 4: Mixed-warm or mixed-humid areas (Virginia)

• Zone 5: Cool areas (Ohio, Washington)

• Zone 6: Cold areas (Vermont)

• Zone 7: Very cold areas (Northern Minnesota, Upper Peninsula of Michigan)

• Zone 8: Subarctic areas (Northern Alaska)

How Does Your Climate Zone Affect the Amount of Attic Insulation You Need?

Warmer climate zones (Zones 1 to 3) need lower R-values (about 10 to 13 inches of insulation) to help prevent heat from penetrating the attic and moving into your home. Colder climate zones (Zones 6 to 8) require higher R-values (16 to 20 inches of insulation) to create a strong barrier against cold outdoor temperatures.

If you live in a mixed climate zone (Zones 4 and 5) with all four seasons that experience both hot summers and cold winters, you'll probably need between 13 and 20 inches of material to insulate your home. When you schedule insulation installation with a professional heating and cooling specialist, they can recommend the best options for your home's needs.

Does Attic Insulation Reduce Heating and Cooling Costs?

According to the Environmental Protection Agency (EPA), insulating your attic, crawl space, and basement floor may help reduce heating and cooling costs by up to 15% when cracks, holes, and gaps are properly sealed. Attic insulation, combined with proper air sealing, may also cut your total home energy costs by 11%.