Attic insulation in Toronto and the GTA typically costs around $1.50 to $3.50 per square foot installed for a complete new installation project. Please note that this pricing reflects a full installation; if your attic already has functional insulation and you only require a blow-in top-up, the cost will be significantly lower. The final price depends on your current insulation levels, whether old or damaged material needs to be removed, and any prep work required before adding new insulation.
For a quick planning estimate:
| Attic Size | Typical Cost Range (Full Installation) |
|---|---|
| 500 sq. ft. | $750-$1,750 |
| 750 sq. ft. | $1,125-$2,625 |
| 1,000 sq. ft. | $1,500-$3,500 |
| 1,500 sq. ft. | $2,250-$5,250 |
A straightforward attic insulation top-up (adding blown-in insulation over your existing layer) requires less labor and materials, making it more affordable than a complete overhaul or removal project.
What Affects the Cost of Attic Insulation?
The biggest cost difference is often the condition of your attic before the work starts.
Existing insulation level: An attic that only needs to be topped up to R-50 requires less material than an attic with little or no existing insulation.
Old insulation removal: Clean, dry insulation can often stay in place and be topped up. Wet, moldy or pest-contaminated insulation may need to be removed first, adding labour and disposal costs. See our guide on whether you should remove old attic insulation before adding new.
Attic size and access: Larger attics require more material, while difficult access can increase labour time.
Work needed before insulation: Air sealing, ventilation corrections, moisture problems or pest damage should be addressed before adding new insulation.
This is why two homes with similar square footage can receive very different attic insulation quotes.
Not sure whether your attic needs a simple top-up or more extensive work? Mas Air offers free in-home attic assessments across Toronto and the GTA, so you can see what is actually needed before getting a final quote.
How Much Can Rebates Reduce Your Attic Insulation Cost?
Ontario’s Home Renovation Savings program can reduce the cost of qualifying attic insulation.
For a Single Upgrade, the rebate covers 50% of the eligible after-tax insulation cost, up to:
| Existing Insulation | Maximum Rebate |
|---|---|
| R-12 or less | $1,250 |
| Above R-12 to R-25 | $1,000 |
| Above R-25 to R-35 | $800 |
For example, if an eligible attic insulation project costs $2,000 after tax and your existing insulation is R-12 or lower, the rebate can cover $1,000, bringing the after-rebate cost down to $1,000.
Homeowners completing two or more eligible energy upgrades can use the Bundled Upgrades route, where the attic insulation rebate can reach $1,500.
See our 2026 Ontario Attic Insulation Rebate Guide for the current rebate amounts, eligibility rules and the difference between Single and Bundled Upgrades.
Get an Exact Attic Insulation Cost for Your Home
Online prices are useful for setting a budget, but your actual attic insulation cost depends on what is already in the attic and what work is needed to bring it up to the proper level.
Mas Air Home Comfort offers free in-home attic assessments across Toronto and the GTA. We can check your existing insulation, determine whether you need a top-up or removal, calculate the insulation required and provide an upfront quote.
If your project qualifies for a rebate, we can also help you understand the expected after-rebate cost before the work begins.
Call 647-360-6623 or book a free attic assessment online for an exact attic insulation quote.
