Window Replacement

Overview

Window replacement is one of the most impactful energy upgrades a Canadian homeowner can make. In a country where winter temperatures regularly drop below minus 20 degrees Celsius and summer heat pushes air conditioning costs up, high-performance windows pay for themselves through reduced energy bills.

Modern double- and triple-pane windows with low-E coatings and argon or krypton gas fill dramatically outperform the single-pane or early double-pane windows found in many Canadian homes built before 2000. Beyond energy savings, new windows reduce drafts, eliminate condensation between panes, block street noise, and refresh the home's appearance.

Most replacement projects involve removing the old sash and frame and installing a new full-frame or insert window. The choice depends on the condition of the existing frame and the homeowner's budget. Full-frame replacements cost more but are the better option when frames are rotted or damaged.

What to Expect

In-home measurement by the window supplier or installer
Selection of frame material (vinyl, fibreglass, wood, or aluminum-clad)
Custom fabrication of windows (typically 4 to 8 weeks lead time)
Removal of old windows one at a time to minimize exposure to weather
Installation, shimming, and insulating each opening
Interior casing and exterior brick mould or trim installation
Caulking and sealing all joints
Cleanup and disposal of old windows
Project completion in 1 to 3 days for a typical home

Cost Factors

The number and size of windows is the primary cost driver. Frame material matters — vinyl is the most affordable, fibreglass offers superior durability, and wood provides a premium look but requires maintenance. Triple-pane glass costs 15 to 25% more than double-pane but offers better insulation for colder provinces. Custom shapes (arches, bays, or oversized units) add cost. Installation complexity, such as windows on upper storeys requiring scaffolding, also increases the price.

How to Save Money

Replace windows in phases, starting with the most drafty or damaged units
Choose vinyl frames, which offer excellent thermal performance at the lowest cost
Take advantage of federal and provincial energy rebate programs like the Canada Greener Homes Grant (or its successor programs)
Order standard sizes rather than custom dimensions when possible
Get quotes from at least three installers and compare the total installed price, not just the window cost

Hiring Tips

Choose an installer certified by the window manufacturer to protect warranty coverage
Ask whether the quote includes interior and exterior trim finishing
Verify the installer uses low-expansion spray foam insulation around each frame
Confirm disposal of old windows is included in the price
Check that the windows meet or exceed ENERGY STAR Canada requirements for your climate zone

FAQ

How much can new windows save on energy bills?

ENERGY STAR-rated windows can reduce heating and cooling costs by 15 to 25% compared to single-pane windows. Savings depend on your province's climate zone, the number of windows replaced, and your home's overall insulation.

Should I choose double-pane or triple-pane windows?

In most of Canada, triple-pane windows are worth the extra cost, especially in provinces with harsh winters like Alberta, Manitoba, Saskatchewan, and Ontario. In milder coastal areas of British Columbia, quality double-pane windows with low-E coating may be sufficient.

How long do replacement windows last?

Quality vinyl or fibreglass windows typically last 20 to 30 years. Wood windows can last longer with proper maintenance. The sealed glass unit may need replacement after 15 to 20 years if the seal fails and condensation appears between panes.