Attic Insulation Prices in Ontario (2026)

Ontario homes built before 1990 typically have attic insulation rated at R-12 to R-20, well below the current target of R-60 recommended by Natural Resources Canada. Upgrading to R-60 dramatically reduces heat loss in winter and keeps homes cooler in summer. The cost depends on your attic square footage, the type of insulation chosen, and whether old material must be removed first.

Canada Greener Homes Rebates Available in Ontario

The Canada Greener Homes Grant provides Ontario homeowners with rebates of up to $5,600 toward eligible insulation upgrades. To qualify, you must complete a pre-upgrade EnerGuide home energy evaluation, use a registered energy advisor, and have the work done by a qualified contractor. The rebate for attic insulation specifically can reach $2,700 when you upgrade to R-60 from a low baseline. Spray foam and advanced air sealing may unlock additional rebate tiers.

7 Factors That Affect Attic Insulation Cost in Ontario

Blown-in cellulose and fiberglass are the most common choices for Ontario attics — they are fast to install, cost-effective, and eligible for Greener Homes rebates. Spray foam is recommended when air sealing is a major concern, such as in older homes with significant attic bypasses around electrical boxes, plumbing penetrations, and partition walls. Many contractors use a hybrid approach: spray foam for air sealing critical gaps, then blown-in over the top to reach the R-60 target efficiently.

Attic Insulation Cost Ontario 2026

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