Best Insulation Contractors in Markham, ON
9 insulation contractors found in Markham
Constant Home Comfort
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
Ntoulis Group Construction & Renovation
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
Aireno
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
AIRENO HOME
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
AIRENO HOME
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
PAQ1CONSTRUCTION
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
Volga Group Inc
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
inacon inc
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
Inacon inc
Markham, ON
Ratings aggregated by AI and may contain inaccuracies.
How much does insulation cost in Markham?
Most Canadian homeowners spend $1,800-$4,500 to insulate a typical attic in 2026 - a blown-in top-up to R-60, or about $1.50-$3.00 per square foot installed - with the average job landing near $2,800, before rebates. Batt insulation for walls runs a similar $1.50-$3.00/sq ft, while closed-cell spray foam is the premium option at $3.00-$7.00/sq ft. Whole-home spray-foam packages commonly run $3,000-$12,000.
In Markham, ON, typical quotes tend to come in above the Canadian average, so the table below nudges these national figures up by roughly 15% at the low end of each range and up to 30% at the top end.
What moves the price: The low end is a blown-in attic top-up or basic batts; the top end is closed-cell spray foam and whole-home packages, plus removal of old insulation first.
| Project | Typical cost in Markham |
|---|---|
| Blown-in attic insulation (loose-fill fibreglass or cellulose) | $2.50 $1.75 to $4 per sq ft |
| Blown-in attic top-up to R-60 - typical home (900-1,500 sq ft attic) | $3,400 $2,100 to $6,000 per project |
| Batt insulation (fibreglass or mineral wool) - walls | $2.75 $1.75 to $4 per sq ft |
| Open-cell spray foam (0.5 lb) | $3 $1.75 to $4.50 per sq ft |
| Closed-cell spray foam (2.0 lb) - basements, rim joists, cathedral ceilings | $5.50 $3.50 to $9 per sq ft |
| Basement wall insulation - full basement (800-1,000 sq ft) | $4,900 $2,900 to $8,500 per project |
| Remove old / contaminated insulation before re-insulating | $1.75 $1.25 to $3.25 per sq ft |
| Whole-home spray foam package (attic + walls + basement) | $8,500 $3,400 to $15,500 per project |
What changes the price of insulation in Markham
- R-value target: pushing an attic to R-60 versus a lighter R-40 top-up means more material and more depth, which adds cost.
- Removing old insulation: clean, dry insulation can usually be topped up, but wet, mouldy, rodent-damaged, or old vermiculite material must be removed first, adding roughly $1.00-$2.50 per sq ft (more if hazardous-material handling is needed).
- Attic access and layout: low-pitch roofs, tight crawl spaces, dormers, and multi-level attics slow the crew down and push labour up.
- Air sealing and prep: sealing gaps, adding vent baffles, and boxing out around pot lights and the attic hatch before insulating adds materials and time but is usually worth it.
- Area size and rebates: a bigger area costs more up front, but provincial and utility rebates can claw back $1,000 to $7,700 of the net cost in some provinces.
- Insulation type: batt is cheapest, blown-in is mid-priced, and closed-cell spray foam is the most expensive - often 2 to 4 times the cost of batt for the same area.
How insulation prices vary across Canada
Toronto, Vancouver, and other big metros run roughly 10-25% higher than small-town and rural pricing, almost entirely on the labour portion - material costs barely move. One important caveat: attic insulation is heavily rebate-driven in the GTA, so some contractors advertise very low headline prices (as low as about $0.99 per sq ft) that already net out the rebate. Treat those as marketing figures, not the true base install cost - the real pre-rebate range still sits in the $1.50-$3.00 per sq ft band.
These are typical Markham-area price ranges based on 2026 Canadian market data, not quotes. Your actual cost depends on the size and details of your project. Post your project on Bidmii to get free quotes from the 9 insulation contractors listed in Markham above.
Frequently Asked Questions about Insulation in Markham
How much does insulation cost in Markham?
The cost of insulation services in Markham, ON varies depending on the scope of work. Post your project on Bidmii to receive free, competitive quotes from local professionals.
How do I find a licensed insulation contractor in Markham?
Browse our directory of insulation contractors in Markham above. Look for contractors with the Verified badge, which means their identity has been confirmed. You can also check ratings aggregated from multiple platforms.
How many insulation contractors are in Markham?
Bidmii currently lists 9 insulation contractors in Markham, ON. Our directory is growing — create a free listing if you're a contractor.
Do I have to remove my old insulation first?
Usually not. If the existing insulation is clean and dry, a new layer can be blown right on top. Removal (about $1.00-$2.50 per square foot) is only needed when the old material is wet, mouldy, rodent-damaged, or contains older vermiculite that needs special handling.
How much does it cost to insulate an attic in Canada?
For a typical home in 2026, a blown-in top-up to R-60 usually runs about $1,800-$4,500 installed, or roughly $1.50-$3.00 per square foot. Spray foam costs more, and rebates can lower your final out-of-pocket cost.
Is spray foam worth the extra cost over blown-in?
Closed-cell spray foam costs about 2 to 4 times more, but it seals air leaks, blocks moisture, and gives the highest R-value per inch - which makes it the go-to for basements, rim joists, and cathedral ceilings. For an open, walk-around attic floor, blown-in usually gives better value for the money.