How Much Does Attic Insulation Cost in Toronto & the GTA? (2026 Guide)

Updated October 2026 · By the Attic Pros team · 6 min read

Typical prices in 2026

These are typical ranges we see across Ontario for a regular attic. They are a guide, not a quote. HST (13%) is extra.

Job	Typical price	What it usually means
Top-up with blown-in insulation	about $1.50–$3.00 / sq ft	Old insulation is dry and clean. New insulation goes on top.
Remove old insulation	about $1.50–$3.50 / sq ft extra	Vacuum out insulation that is wet, moldy, soiled or flattened.
Baffles at the eaves	small add-on per rafter bay	Keeps soffit vents open so the attic can breathe.
Air sealing and hatch insulation	varies with the attic	Seals gaps that leak warm air into the attic.
Wildlife cleanup and sanitizing	quoted after inspection	Removing droppings and disinfecting after raccoons, squirrels or mice.

At Attic Pros, complete projects start from $1,500, and attic sanitization is included on insulation projects at no extra charge.

What actually changes the price

1. Attic size

Insulation is priced by the square foot of attic floor. A 1,000 sq ft bungalow attic costs far less than a 2,000 sq ft one. Your attic floor is roughly the size of your top floor.

2. Keep or remove the old insulation

This is the biggest swing. If the old insulation is dry and clean, we simply add more on top. If it is soaked, moldy, or full of droppings, it has to come out first, which can roughly double the job. Not sure which you need? See remove or top up: how to decide.

3. How much insulation you are adding

Going from R-12 (about 3–4 inches) to R-60 (around 17–24 inches) takes much more material than going from R-30 to R-50.

4. Prep work done properly

Baffles, sealing gaps around pot lights and pipes, and insulating the attic hatch add some cost but make the insulation work much better. Skipping them is how cheap jobs end up with frost, mold or ice dams.

5. Access and material

Low, tight or hard-to-reach attics take longer. Blown fibreglass and cellulose are the most common. Premium materials such as hemp cost more.

Worked example with the rebate

	Amount
1,000 sq ft attic, top-up from R-12 to R-60 at about $2.50 / sq ft	$2,500
HST (13%)	$325
After-tax cost	$2,825
Rebate: 50% of $2,825 is $1,412, capped at the maximum	−$1,250
Your cost after the rebate	about $1,575

Rules and tiers are explained in our Ontario attic insulation rebate guide.

How to compare quotes fairly

• Is the final R-value written on the quote? (It must be R-50 or more for the rebate.)
• Does it say whether old insulation is removed or left in place?
• Are baffles, air sealing and the hatch included?
• Is cleanup and disinfection included if there were animals?
• Will you get photos or thermal images of the finished work?
• What does the warranty cover, and for how long?

Is it worth it?

For most older GTA homes, yes. Heat rises, so an under-insulated attic is where a lot of winter heat escapes. Upstairs rooms get more comfortable, the furnace runs less, and with the rebate the upgrade costs much less than people expect.

Frequently asked questions

How long does attic insulation take?

A straightforward top-up is usually done in a day. Projects that include removal and cleanup typically take 1–2 days.

Do you charge for the quote?

No. Our inspection and quote are free, and include thermal imaging.

Is spray foam better for attics?

For a regular vented attic, blown-in insulation is usually the better value. Spray foam suits special cases such as cathedral ceilings or very tight spaces.