Two of the five insulation services in Toronto featured here, FOAMIT and Space Insulation, hold a perfect 5.0 Google rating. Great Northern Insulation carries the largest review base on this page at 552, more than double Space Insulation's 233, even though its 4.7 average sits below every other name on this list.
Short answer: The most-reviewed insulation company in Toronto is Great Northern Insulation (4.7 stars across 552 Google reviews, the most of any local insulator), followed by attic specialists EcoComfort (4.9) and Confirmed Attics & Insulation (4.9). FOAMIT and Space Insulation both hold a perfect 5.0 on slightly fewer reviews. Expect blown-in attic insulation to run about $1.50, $3.50 per sq ft in 2026, with Ontario rebates returning up to $1,250 on attic upgrades.
#1 Overall🕑 Open 5 days/wk
Great Northern Ltd
4.7★★★★★552 Google reviews
Great Northern Insulation (GNI) is one of Ontario's larger insulation companies, running residential and commercial work across the province from its Etobicoke base. Its crews install spray foam, attic and basement insulation, remove old material, air-seal, and carry out energy audits, and the company folds available rebates into the quote through its own guides. Retrofit and new-construction jobs both sit under one roof, with a commercial arm operating as GNI Management Group. That breadth makes it a natural first call for a full-home upgrade rather than a single attic.
What people praise
- Covers spray foam, attic, basement and commercial work under one company
- Crews mask off rooms in plastic and vacuum up afterward, so the house stays clean
- Technicians explain what was done and share before-and-after photos
- Extras like baffles for airflow, a tighter attic hatch and window caulking noted by reviewers
- Repeat mentions of fair pricing on larger jobs
Worth knowing
- Weekday-only hours (closed weekends), so book ahead for scheduling
- A province-wide contractor rather than a boutique attic-only specialist
Reputation scorecardrank in Toronto
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Our take: It is the most-reviewed insulation company in Toronto by far, which is why it ranks first on proven volume even though its 4.7 sits just under the perfect scores lower down. For a whole-home job with rebates handled for you, it is the safe default.
📍2 Guided Ct, Etobicoke, ON M9V 5G2, Canada
#2🕑 Open 5 days/wk
EcoComfort Insulation & Contracting Inc.
4.9★★★★★364 Google reviews
EcoComfort Insulation & Contracting is a family-owned attic specialist that has served Toronto and the GTA since 2010, working out of Mississauga. Its focus is the attic top to bottom: inspection, insulation, ventilation, upgrades, old-insulation removal, mould remediation and roof-leak repair. The team also registers homeowners for the Enbridge and Home Renovation Savings Program rebates as part of the job. That narrow attic focus, plus rebate support, is what earns it one of the highest ratings on this list.
What people praise
- Arrives on time, protects the space, then cleans and disinfects the attic
- Handled the full rebate paperwork, pre- and post-work, for several reviewers
- One customer was told the job wasn't needed, no upselling
- Proactive follow-through, checking back to finish weather-delayed work without being chased
Worth knowing
- Attic-focused rather than a full whole-home or commercial contractor
- Weekday-only hours
Reputation scorecardrank in Toronto
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Our take: A 4.9 across 364 reviews and the highest confidence score among the top raters here. If your job is squarely an attic upgrade and you want the rebate handled, this is the specialist pick.
📍6800 Kitimat Rd #25, Mississauga, ON L5N 5M1, Canada
#3🕑 Open 6 days/wk
Confirmed Attics & Insulation
4.9★★★★★311 Google reviews
Confirmed Attics & Insulation is a GTA attic and air-sealing specialist based in Markham, WSIB certified and fully insured. It handles blown-in attic insulation, old-insulation removal, dense-pack wall and basement insulation, spray foam, air sealing and attic mould remediation, and it processes the up-to-$1,250 rebate for homeowners. The company backs its work with a ten-year warranty and a free in-person assessment. It is one of the few here open on Saturdays.
What people praise
- Ten-year warranty and WSIB-certified, fully insured crews
- Reviewers cite no cut corners, clear explanations and a tidy work area
- Handles mould remediation and brings older attics up to R60 code
- Rebate processed on the customer's behalf
- Open six days, including Saturdays
Worth knowing
- Attic and air-sealing focus rather than a full-service home contractor
- Closed Sundays
Reputation scorecardrank in Toronto
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✓ VerifiedSource: Google
Our take: A 4.9 from 311 reviews, a real warranty and certification give it a paper trail many insulators lack. A strong pick when you want the work guaranteed and the drafts sealed properly.
📍2600 John St. #208, Markham, ON L3R 3W3, Canada
#4🕑 Open 6 days/wk
FOAMIT
5.0★★★★★261 Google reviews
FOAMIT is a Toronto spray-foam and attic insulation specialist that has worked across the GTA since 2008, covering Toronto, Mississauga, Oakville and beyond from its Mississauga shop. It serves residential, commercial and industrial properties, with spray foam for roof decks, rim joists and containers alongside standard attic insulation. More than fifteen years in, it has become a repeat subcontractor for other trades. That long, contractor-trusted record sits behind its perfect rating.
What people praise
- Same-day callback and a free in-home quote noted by reviewers
- Punctual, respectful of the property and clean at the end of the job
- Trusted by other contractors on repeat spray-foam work over many years
- Fair, reasonable pricing with an immediate comfort improvement reported
Worth knowing
- Best known for spray foam specifically rather than every insulation type
- Perfect rating rests on a smaller review base than the top three names
Reputation scorecardrank in Toronto
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✓ VerifiedSource: Google
Our take: We rank it fourth on proven volume, not quality, the 5.0 across 261 reviews is elite, it simply has fewer ratings than the companies above. For a spray-foam job, it is our first call.
📍7310 Torbram Rd #1c, Mississauga, ON L4T 3X2, Canada
#5🕑 Open 6 days/wk
Space insulation inc.
5.0★★★★★233 Google reviews
Space Insulation is a locally owned Richmond Hill company serving homeowners and businesses across Ontario, with a focus on the province's climate and building codes. Its crews handle blown-in and spray foam insulation, old-insulation removal, attic mould remediation, air sealing and home energy audits, from older homes to new builds. Consultants inspect the attic in person and outline the work before quoting. Long weekday hours to 8pm and Saturday service make it the easiest here to schedule around a work week.
What people praise
- Repeatedly came in as the best-value quote against competitors
- Thorough hands-on inspection, baffles added and gaps around wiring sealed
- Handles mould removal and disinfection, then installs to R60
- Clean, courteous crews who share before-and-after photos
- Open late on weekdays and on Saturdays
Worth knowing
- Perfect rating rests on a smaller review base than the leaders
- Closed Sundays
Reputation scorecardrank in Toronto
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✓ VerifiedSource: Google
Our take: Another perfect 5.0, this time across 233 reviews, so it ranks fifth on volume rather than any quality gap. The standout draw is value plus the widest hours on this list, a good fit if daytime appointments are hard to make.
📍10660 Yonge St, Richmond Hill, ON L4C 3C9, Canada
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Claim this spot › How we score
Every number on this page is computed from public Google data on the date shown, not from opinion or payment. Rating is the company’s live Google star average. Review volume is how many customers have rated them, ranked against other Toronto insulators. Confidence weighs the rating by that volume, so a 4.7 from hundreds of people can outrank a 5.0 from a smaller group. Recency reflects how recently customers are still leaving reviews. No business can pay to change these numbers.
How much does insulation cost in Toronto? (2026)
Insulation pricing in Toronto turns on the material, the square footage, and whether old insulation or mould has to come out first. Blown-in attic work is charged by the square foot, while spray foam costs more but seals air leaks as it goes. Ontario rebates can offset a large share of an attic job. Here are current 2026 CAD ranges:
| Job | Typical price |
|---|
| In-home assessment / quote | Free (most companies) |
| Blown-in attic insulation | $1.50, $3.50 / sq ft |
| Attic top-up (typical home) | $1,500, $3,000 |
| Old insulation removal | $1, $2 / sq ft |
| Open-cell spray foam | $1.50, $3.50 / sq ft |
| Closed-cell spray foam | $3, $7 / sq ft |
| Dense-pack wall insulation | $2, $4 / sq ft |
| Home energy audit | $300, $600 (often rebated) |
Ranges compiled July 2026 from HomeStars, HomeGuide, Fixr and Ontario insulation operators’ published pricing (all CAD). The provincial Home Renovation Savings Program and Enbridge rebate can return up to $1,250 on attic upgrades, confirm eligibility before you book, and get an itemized written quote. These are third-party averages, not quotes from the businesses on this page, so ask each company for its own written price.
Serving Toronto and the GTA
The companies above cover Toronto and the wider Greater Toronto Area, including Etobicoke, North York, Scarborough, East York and the downtown core, plus Mississauga, Markham, Richmond Hill, Vaughan and Oakville. Searching for insulation near me? Every listing below shows a live phone number and directions so you can reach the closest option fast.
What to ask before you hire an insulation company
- Are you WSIB certified and fully insured? (Ask for proof.)
- What R-value are you installing, and does it meet current attic code?
- Are you removing the old insulation, and do you check for mould first?
- Will you handle the Ontario rebate paperwork for me?
- What warranty do you offer on the materials and the install?
- Can I get the estimate in writing before the work starts?
Frequently asked questions
How did you choose these insulation companies?
We started from every insulation company in Toronto with a public Google presence, then ranked by rating, review volume, consistency, and recency. See How we score above.
Are these rankings paid?
No. Rankings come from the public Google data in the scorecard. A business can pay to be a Featured Partner, which adds a badge and top placement, but that never changes another business’s score or position on the underlying data.
How often is this updated?
The data carries a verified date (July 2026 on this page). We refresh listings periodically so ratings and review counts stay current.
How much does attic insulation cost in Toronto?
Blown-in attic insulation runs roughly $1.50 to $3.50 per square foot in 2026, or about $1,500 to $3,000 for a typical home top-up. Removal of old insulation and any mould work add to that. See the cost table above and get a written quote.
Are there insulation rebates in Ontario?
Yes. Ontario’s Home Renovation Savings Program and the Enbridge attic rebate can return up to $1,250 on attic upgrades, with no energy audit required for the standalone attic rebate. Every company on this list can process the paperwork for you.
Spray foam or blown-in, which is better?
Blown-in is cost-effective for open attic floors, while spray foam costs more but air-seals as it insulates, which suits rim joists, roof decks and drafty spots. A good installer will inspect and recommend based on your home, not upsell.
The bottom line
Great Northern is the safe default for most Toronto homeowners on sheer proven track record and whole-home reach, while FOAMIT and Space hold perfect ratings and EcoComfort and Confirmed are the strongest attic specialists. Whoever you call, confirm the R-value and rebate in writing before the crew arrives.
