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Insulation Services in London, ON
Compare 22 insulation services contractors near you in London and surrounding area with an average rating of 4.5/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated March 23, 2026
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Other Businesses in This Area
Affordable Spray Foam Insulation
Tornado Insulation
6+ years onlineHome Choice Insulation
5.0Insulation Contractors London
5.0~3 years onlineKoala Insulation of London
5.07½+ years onlineLondon Spray Foam
5.06 mo onlineAdvanced Basement Systems
4.919½+ years onlineNet Zero Insulation
4.9Canadian Spray Foam Systems Ltd.
4.7Icon Insulation London Shop
4.7S & R Stucco & Insulation
4.7Bay Insulation Systems of Canada ULC
4.228½+ years onlineAM Group Exteriors - London
4.0Insulation Services in Nearby ON Cities
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Insulation Services in London, ON
London, Ontario insulation contractors handle a humid continental climate with hot humid summers, cold winters, and the moisture-management challenges typical of southwestern Ontario. Closed-cell spray foam dominates new construction along with R-22+ batts in 2x6 walls, while existing London homes lean toward fiberglass batt upgrades plus blown cellulose or spray foam in attic floors. Ontario residential energy code requires R-60 attics and R-22 walls minimum in many zones, with most quality installs upgrading to R-60 attics. Save On Energy and the federal Greener Homes program offer prescriptive insulation rebates plus interest-free loans.
London's older 1950s-70s homes often have minimal wall insulation original to construction. Blown-in cellulose or fiberglass through carefully drilled access holes adds R-13-R-15 in 2x4 walls without major drywall disruption. The high humidity drives demand for vapor-managing assemblies that prevent moisture migration into wall cavities. Closed-cell spray foam at rim joists is particularly valuable, stopping the air infiltration that drives heating costs.
Frequently Asked Questions
- What insulation works for London climate?
- R-60+ attic insulation, R-22 wall insulation, and basement rim joist spray foam handle southwestern Ontario climate effectively. The combination of air sealing and R-value matters as much as raw R-value alone. Vapor permeability matters in humid climates to prevent moisture trapping.
- How can I insulate my old London home?
- Blown-in cellulose or fiberglass through carefully drilled access holes adds R-13-R-15 in 2x4 walls without major drywall disruption. Closed-cell spray foam works for limited areas where moisture management is critical. Reputable installers verify wall cavity condition with infrared imaging before quoting blown-in work.
- What rebates apply?
- Save On Energy offers prescriptive insulation rebates of $0.20-0.40 CAD/sq ft for attic, wall, and basement upgrades. The federal Greener Homes grant covers up to $5,000 CAD plus interest-free loans up to $40,000 CAD. Reputable installers handle the rebate paperwork.
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