Top 5 Insulation Contractors
in Markham
We compared 5 Insulation Contractors serving Markham, Ontario using publicly available business information, including customer reputation, local presence and documented services. Across the businesses featured here, documented specialties include Attic insulation installation, Attic insulation top-ups, and Attic air sealing.
★ Markham’s featured insulation contractors have the highest score among the nearby FiveBest markets compared.
Eco Star Home Services Co. provides attic insulation work in Markham, including installation, top-ups, attic air sealing and blown-in fiberglass insulation. Its documented process includes assessing existing R-value and thermal barriers before adding material, making it relevant for homes with drafts, uneven temperatures or attic heat loss.
Attic insulation installation · Attic insulation top-ups · Attic air sealing
For insulation contractors in Markham, EcoComfort Insulation & Contracting Inc. documents attic insulation installation, upgrades and top-ups, removal, and attic ventilation installation.
Attic insulation installation · Attic insulation upgrades and top-ups · Attic insulation removal
Detailed FiveBest Research is not yet available for this business.
Detailed FiveBest Research is not yet available for this business.
Detailed FiveBest Research is not yet available for this business.
Markham insulation contractors lead nearby FiveBest markets
Featured insulation contractors in Markham have a median FiveBest Score™ of 81/100, compared with 77/100 for featured insulation contractors across Ontario.
Among nearby FiveBest markets, those in Richmond Hill (77/100) and Vaughan (80/100) and Toronto (80/100) score below Markham.
Comparison based on profiles currently featured by FiveBest in this category with an available FiveBest Score™.
How we researched Insulation Contractors in Markham
FiveBest reviews publicly available information for Insulation Contractors serving Markham.
- Google rating and review history
- Documented services
- Years in business when available
- Markham and surrounding service coverage
- Business website and online presence
- Independent reputation signals when available
Research last updated: September 2026
Common Services
- Attic insulation in Markham
- Blown-in insulation in Markham
- Spray foam insulation in Markham
- Wall insulation in Markham
- Basement insulation in Markham
- Air sealing in Markham
FiveBest Match™
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FiveBest Match™ — Coming Soon 🔒How to Choose an insulation contractor in Markham
Compare insulation contractors in Markham for attic insulation, blown-in cellulose or fibreglass, spray foam, wall and basement insulation, air sealing, insulation removal, vapour-barrier work and energy-efficiency upgrades. FiveBest helps homeowners compare selected local insulation companies based on relevant services, online reputation and local presence.
Compare selected insulation contractors in Markham for attic insulation, blown-in insulation, spray foam, wall insulation, air sealing, insulation removal and energy-efficiency upgrades.
Ask how current insulation, air leakage, moisture and ventilation conditions will be assessed before adding material.
Confirm insulation type, target thermal value, installed depth or thickness and areas included.
Ask whether air sealing or moisture problems should be corrected before insulation is installed.
Check removal, air sealing, insulation, ventilation baffles, access work, cleanup and disposal.
For spray foam or other specialized products, confirm trained installation, ventilation and occupant instructions.
Ask what documentation is provided for applicable energy programs and what product or workmanship warranties apply.
What Affects Insulation Costs
- Area being insulated
- Existing insulation
- Insulation material
- Target R-value
- Removal of old material
- Air sealing requirements
- Accessibility
- Ventilation modifications
- Moisture remediation
- Cleanup and disposal
Questions to Ask an Insulation Contractor
- How will you assess the existing insulation and air leakage?
- What insulation material and target R-value are specified?
- Is old insulation removal required?
- Is air sealing included?
- How will attic or roof ventilation be maintained?
- Are there moisture issues to correct first?
- What documentation is provided for applicable rebates?
- What product and workmanship warranties apply?
Frequently Asked Questions
Insulation costs in Markham depend on the area to cover, insulation material, existing insulation, required R-value, accessibility, air-sealing work and whether old insulation must be removed. A site inspection helps determine the appropriate scope and price.
The best option depends on the attic condition, existing insulation, ventilation, moisture control, target R-value and budget. Blown-in cellulose or fibreglass are common options, while spray foam may be appropriate in specific assemblies.
Improving attic insulation and air sealing can reduce heat loss and improve comfort when the existing insulation is inadequate. Actual savings depend on the home, climate, heating system and the quality of the installation.
Not always. Existing insulation may sometimes remain if it is dry, clean and in good condition. Removal may be recommended when insulation is contaminated, wet, damaged, compressed or interfering with repairs or air sealing.
Compare experience with the insulation system you need, inspection process, proposed R-value, air-sealing scope, ventilation considerations, product specifications, warranties, cleanup, applicable certifications and recent local reviews.
Programs and eligibility can change over time. Ask the contractor whether current provincial, utility or federal efficiency programs may apply and confirm eligibility with the program provider before starting work.