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Insulation Services in Markham, ON
Compare 26 insulation services contractors near you in Markham and surrounding area with an average rating of 4.8/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated March 28, 2026
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Other Businesses in This Area
Eco Insulation (York)
5.0Efficiency Spray Foam Insulation Ltd.
5.0~7 years onlineEverGreen Premium Insulation
5.0Insulapack - Insulation Manufacturer
5.013 years onlineLogik Roofing & Insulation Richmond Hill
5.016 years onlinePR Foam Insulation Inc.
5.0Sprayfoam Solutions Toronto Inc
5.0Superb Markham Spray Foam Insulation
5.0UCS Spray Foam Insulation
5.0Spray Foam GTA/Right Choice Spray Foam
4.9~10 years onlineSolidcare Home Improvements
4.8Greenvestment Inc. Home Improvement Solutions. Spray Foam
4.02½+ years onlineEcogreen Insulation
1.0~3 years onlineInsulation Services in Nearby ON Cities
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Insulation Services in Markham, ON
Markham insulation contractors in this directory work Unionville, Cornell, Berczy Village, Cathedraltown, and Box Grove. Most Markham attics built in the 1980s-90s have R-30 to R-40 of compressed batts — current code asks for R-60, and topping up with blown cellulose typically runs $1.80-$2.80 per sq ft of attic floor. Closed-cell spray foam in basements and rim joists runs $5-$8/sq ft at 2 inches and qualifies for the Canada Greener Homes Loan and Enbridge HER+ rebate program when paired with an EnerGuide audit.
Markham's mix of 1980s subdivisions in Thornhill and brand-new infill in Cornell means insulation contractors regularly handle both retrofit (drilled fill in walls, attic top-up) and new-construction work. The City and Enbridge co-fund rebates that can offset $2,000-$10,000 of upgrade cost.
Frequently Asked Questions
- What R-value should my Markham attic have?
- Current OBC SB-12 prescribes R-60 in Climate Zone 6 attics. Most pre-2012 Markham homes have R-30 to R-40 — adding R-20 to R-30 of blown cellulose or fibreglass is the highest-ROI single upgrade for a typical home.
- Are there rebates for insulation in Markham?
- Yes — Enbridge Home Efficiency Rebate Plus offers up to $10,000 for attic, wall, and basement upgrades when stacked with an EnerGuide pre/post audit. The Canada Greener Homes Loan adds a 0% interest loan up to $40,000 over 10 years for qualifying retrofits.
- Is spray foam safe in a finished Markham basement?
- Closed-cell at code-required thickness with proper ignition barrier (ThermaShield or 1/2 drywall) is safe and code-compliant. Always confirm the contractor uses 2-component low-GWP foam and ventilates the space during the 24-hour cure.
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NeedInstall helps connect customers with local installation professionals across Markham and surrounding communities. Featured contractors have claimed their profile and verified their business information. Listings marked as "Verified Pro" have been confirmed by the business owner.