How much does a Insulation Installer cost in Montreal in 2026?

What's Involved

Insulation projects involve adding or upgrading thermal barriers in your attic, walls, basement, or crawl space to reduce heat loss and lower energy bills. Common insulation types in Canada include blown-in fibreglass or cellulose (ideal for attics), batt insulation (walls and basements), and spray foam (both open-cell and closed-cell) for superior air sealing.

A professional insulation contractor will assess your current insulation levels, identify air leaks, and recommend upgrades to meet or exceed the building code minimum R-values for your climate zone. In Montreal, current code typically requires R-50 to R-60 in attics and R-20 to R-24 in basement walls, though these vary by province.

Many Canadian homeowners start with an EnerGuide home energy audit, which identifies insulation priorities and qualifies you for federal Greener Homes grants and provincial rebate programs. These programs can offset a significant portion of the project cost.

Factors That Affect Cost

• Insulation type — Blown-in cellulose ($1.50-$3/sq ft) vs. batt ($1.50-$3.50/sq ft) vs. open-cell spray foam ($3-$5/sq ft) vs. closed-cell spray foam ($5-$9/sq ft).
• Area to insulate — Attic top-ups are straightforward; walls and basements require more labour.
• Current insulation condition — Removing old, damaged, or vermiculite insulation (which may contain asbestos) adds significant cost.
• Air sealing — Sealing gaps around wiring, plumbing, and ductwork before adding insulation improves performance and is often required for rebate eligibility.
• Accessibility — Tight crawl spaces and cathedral ceilings are more difficult and expensive to insulate.
• R-value target — Higher R-values require more material and potentially thicker wall assemblies.

How to Save Money

1. Start with an EnerGuide audit ($300-$600, often partially rebated) to identify the highest-impact upgrades.
2. Apply for Canada Greener Homes grants — insulation upgrades can qualify for $1,000-$5,000 in rebates.
3. Prioritize attic insulation — it offers the best energy savings per dollar spent.
4. Get three quotes from insulation contractors in Montreal and compare R-value, product type, and warranty.
5. Bundle air sealing with insulation work — doing both at once is cheaper than separate visits and maximizes energy savings.

Hiring Tips

1. Choose a contractor certified by the insulation manufacturer (e.g., Icynene, Demilec, or Owens Corning certified installer).
2. Verify they carry liability insurance and workers' compensation coverage.
3. For spray foam, confirm they use properly trained applicators and provide documentation of product thickness and R-value.
4. Ask whether they perform blower-door testing to verify air sealing improvements.
5. Get references from recent projects in Montreal and confirm the contractor is registered for applicable rebate programs.

FAQ

How much does insulation cost in Montreal?

An attic top-up with blown-in cellulose for a 1,000 sq ft attic costs $1,500-$3,000. Basement wall insulation with batt and vapour barrier runs $3,000-$6,000. Full spray foam insulation for a basement costs $4,000-$9,000. Whole-home insulation upgrades range from $5,000-$15,000.

Do I need a permit for insulation in Montreal?

Insulation-only projects generally do not require a building permit. However, if you are finishing a basement or renovating walls as part of the project, permits may be required. Asbestos-containing vermiculite removal requires licensed abatement contractors and may involve permits.

How long does insulation installation take?

An attic top-up takes half a day to 1 day. Basement wall insulation takes 1-3 days. Spray foam for an entire home takes 1-2 days for application, plus curing time. A full insulation retrofit project can take up to a week.