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

What's Involved

Window replacement involves removing old windows, inspecting and repairing the rough opening, installing the new window unit, insulating around the frame, and finishing with interior and exterior trim. There are two main approaches: retrofit (insert) installation, where the new window fits inside the existing frame, and full-frame replacement, where the entire window assembly including the frame is removed and replaced.

In Canada, energy efficiency is a primary driver for window replacement. Modern windows feature double or triple glazing, low-E coatings, argon or krypton gas fills, and insulated spacers. Look for ENERGY STAR certification for your climate zone — windows sold in Montreal should meet the Canadian ENERGY STAR standard for your region.

Professional installers typically handle one-story windows from the interior. Second-story or hard-to-reach windows may require scaffolding or lifts. A full-home window replacement is usually completed room by room to minimize exposure to weather.

Factors That Affect Cost

• Window type — Casement, double-hung, awning, sliding, and fixed windows each have different price points.
• Size and quantity — Custom or oversized windows cost significantly more than standard sizes.
• Glazing — Double-pane ($400-$800 per window) vs. triple-pane ($600-$1,200 per window installed).
• Frame material — Vinyl (most affordable) vs. fibreglass vs. aluminum-clad wood (most expensive).
• Installation type — Retrofit insert ($300-$500 labour per window) vs. full-frame ($500-$900 labour).
• Exterior finishing — Aluminum capping, brick mould, or stucco repair adds to the cost.
• Number of windows — Bulk pricing typically applies for whole-home replacements in Montreal.

How to Save Money

1. Replace all windows at once to benefit from bulk pricing — per-window costs drop 10-20%.
2. Choose vinyl frames — they offer excellent thermal performance at the lowest price point.
3. Apply for Canada Greener Homes grants — ENERGY STAR window upgrades qualify for $50-$250 per window in rebates.
4. Opt for retrofit installation where the existing frame is in good condition — it saves $200-$400 per window.
5. Get three quotes from window companies in Montreal and compare product specs, not just price.

Hiring Tips

1. Choose an installer who offers both the product and installation warranty — avoid situations where the manufacturer and installer blame each other for issues.
2. Verify they carry liability insurance and WSIB/WCB coverage.
3. Ask about their sealing and insulation process — proper spray foam and flashing around the frame prevents drafts and water infiltration.
4. Request ENERGY STAR product documentation and confirm the windows meet the standard for your climate zone in Montreal.
5. Check reviews and ask for references from recent whole-home installations in your area.

FAQ

How much does window replacement cost in Montreal?

A standard double-pane vinyl window costs $500-$900 installed (retrofit) or $700-$1,200 (full-frame). Triple-pane upgrades add $150-$300 per window. A full-home replacement of 10-15 windows typically ranges from $7,000 to $18,000 depending on size and specifications.

Do I need a permit for window replacement in Montreal?

Replacing windows in existing openings of the same size generally does not require a permit. If you are changing the size of the opening, adding new windows, or converting a window to a door, a building permit is required. Egress windows in bedrooms must meet building code size requirements.

How long does window replacement take?

Professional installers typically complete 4-8 windows per day. A full-home replacement of 12-15 windows takes 2-3 days. Full-frame replacements take longer than retrofit installs due to additional trim and finishing work.