Insulation in Ontario

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Typical insulation costs in Ontario (2026)

Attic blown-in insulation (to R-50) $1,500-$3,500
Attic blown-in insulation (to R-60) $2,000-$4,500
Batt insulation (exterior walls) $2,500-$6,000
Spray foam (rim joist / air sealing) $800-$2,500
Old insulation removal $1,000-$3,000

contractor.ca market research, Ontario contractor quotes (2025-2026). Ontario HRSP rebates of up to $1,250 may apply for qualifying upgrades. Costs vary by home size, current R-value, and access.

Ontario's Home Renovation Savings Program (HRSP) offers up to $1,250 for qualifying attic insulation upgrades. Enbridge gas-heated homes can get up to $2,000 for a cold-climate air-source heat pump through Home Renovation Savings (the older HER+ program is closed). See rebates for current details.

Frequently Asked Questions

What R-value does Ontario code require for attic insulation?

Ontario Building Code requires R-60 for attic insulation in new construction. Most older Ontario homes have R-20 to R-30 in the attic - upgrading to R-50 or R-60 meaningfully reduces heat loss and can lower heating costs by 15-25% depending on the home.

Are there insulation rebates available in Ontario?

Yes. The Ontario Home Renovation Savings (HRSP) program offers rebates for attic insulation upgrades (the older Enbridge HER+ program is closed). Rebates of up to $1,250 are available for qualifying projects. See /rebates for current program details and eligibility.

Should I remove old insulation before adding new?

Not necessarily. Blown-in cellulose or mineral wool can be added on top of existing fiberglass batts if the existing insulation is dry and undamaged. If there is moisture damage, mold, or vermiculite (common in pre-1990 Ontario homes), removal and remediation is required first.

How much does attic insulation cost in Ontario?

Blown-in attic insulation to R-50 typically costs $1,500-$3,500 in Ontario for a standard home. Upgrading to R-60 runs $2,000-$4,500. Available HRSP rebates (up to $1,250) reduce the net cost for eligible homeowners. The investment typically pays back in reduced heating and cooling costs within 3-7 years.

When is the best time to insulate a home in Ontario?

Insulation upgrades can be done year-round, but fall is ideal for attic work before the heating season begins. This lets you capture the energy savings immediately over the winter. Summer is a good time for wall insulation if the work requires exterior access. Avoid scheduling attic work during Ontario's extreme heat days for worker safety.

What should I ask an insulation contractor before hiring them in Ontario?

Ask them to assess your current R-value before quoting, confirm which rebate programs the work qualifies for and whether they handle the paperwork, and verify what material they are installing (blown-in cellulose, mineral wool, or fiberglass batts each have different R-values per inch). Ask for a post-installation report confirming the final R-value achieved.