Attic Insulation Cost in Canada in 2026 (Blown-In, Spray Foam and Batt)
2026 CAD cost to insulate or top up an attic in Canada: blown-in cellulose and fibreglass, spray foam, air sealing, R-value targets and rebates.
Attic insulation is one of the best-value upgrades in a cold climate, and one that homeowners ask about every winter. Typical 2026 installed ranges:
Installed cost
- Blown-in fibreglass or cellulose: about $1.50–$4 per square foot
- Fibreglass batts: about $2–$5 per square foot
- Spray foam (closed-cell): about $4–$9+ per square foot depending on thickness
A typical 1,000 square foot attic often costs roughly $2,000–$6,000 for blown-in, and considerably more for spray foam. Costs rise with removal and air sealing.
R-value targets
Recommended attic R-values in Canada depend on climate zone and building code, commonly in the R-50 to R-60 range for colder regions. Confirm the current requirement for your province and municipality.
Air sealing comes first
Insulation over leaky ceilings underperforms. Sealing penetrations around pot lights, plumbing stacks, wiring and the attic hatch is typically part of a good job and often worth a separate line item.
Other cost factors
- Removing old or contaminated insulation (vermiculite requires testing for asbestos before disturbance)
- Baffles and ventilation, to keep soffit airflow open
- Access: tight attics take more labour
- Moisture or mould repairs first
Rebates
Many programs have supported insulation upgrades, usually requiring a pre-retrofit energy evaluation. Verify current rules: rebate guide for contractors.
Quoting insulation
Include area, depth and R-value achieved, material, air sealing, baffles, removal and a clear statement about the exclusion of hidden moisture problems. Contractors using quoting software can attach photos and send the quote the same day. For a related winter job, see the winterizing checklist.