What it costs in the GTA
| Job | Typical range |
|---|---|
| Blown-in attic insulation, full attic | $1,500–$4,500 |
| Attic air sealing, on its own | $800–$2,500 |
| Basement wall insulation | $1,500–$5,000 |
| Spray foam, per sq ft | $3–$8 |
Before HST and rebates. Vermiculite (possible asbestos) removal plus re-insulation runs about $6,500–$14,000. Ranges where published GTA and Ontario sources overlap, checked November 2026. Not a quote.
Rebates, permits & rules
- Home Renovation Savings has a standalone attic path: up to $1,250 (up to $750 for cathedral ceilings), no energy audit, through participating contractors. Eligibility depends on your current and finished R-value.
- A bigger multi-upgrade path (insulation plus other upgrades, with before-and-after energy audits) pays more, up to $7,700 in total.
- Ontario's Home Renovation Savings program is scheduled to end November 30, 2026. If you're counting on a rebate, confirm it's still open, and that your contractor is a participating one, before you sign.
- Old loose, grey-brown, pebbly attic insulation may be vermiculite, which can contain asbestos. Don't disturb it. Get it tested.
- Signed the contract at your home? Ontario gives you 10 days to cancel most contracts signed there, for any reason.
What a complete quote includes
If any of these aren't on your quote, ask. Missing doesn't mean it's wrong, but it should be in writing.
- Area and location (attic, walls, basement)
- Starting R-value and target R-value
- Insulation type and installed depth
- Air sealing (top plates, pot lights, attic hatch)
- Baffles to keep soffit vents clear
- Removal of old insulation, if any
- Vermiculite or asbestos testing, if suspected
- Rebate eligibility and who files it
- Warranty
- No starting or target R-value
- No air sealing in an attic job
- Rebate 'guaranteed' before eligibility is checked
- Insulating over suspected vermiculite without testing
- If you can see the tops of the ceiling joists in your attic, you probably need more insulation.
- New Ontario homes are built to about R-60 in the attic. Many older homes have R-12 to R-20.
- Air sealing first, then insulation. Insulation alone doesn't stop warm air leaking into the attic.
- Ice dams and very uneven upstairs temperatures are common signs.
5 questions to ask before you sign
- What R-value do I have now, and what will I have after?
- Is air sealing included?
- Are you a participating Home Renovation Savings contractor, and will you file the rebate?
- Does my attic have vermiculite?
- How will you keep the soffit vents clear?
Paste your quote into ChatGPT, Claude or Gemini with this prompt:
I'm a homeowner in [city], Ontario. Here is my insulation quote: [paste]. List what it includes and leaves out (area, starting and target R-value, type and depth, air sealing, baffles, removal, testing, rebate paperwork, warranty), flag anything vague, and give me 5 questions to ask before I sign. Don't guess a fair price.
Or skip the copy-paste: our free Quote Checker already knows what a insulation quote should include, and compares the price with real GTA ranges.
Common questions
How much does attic insulation cost in Ontario?
A full blown-in attic top-up typically runs about $1,500–$4,500 before rebates.
Is there an attic insulation rebate in Ontario?
Yes. Home Renovation Savings offers up to $1,250 for a standalone attic upgrade with no audit, through participating contractors. It's scheduled to end November 30, 2026.
What R-value should my attic be?
New Ontario homes are built to about R-60. The rebate requires reaching a minimum level from a low starting point.