When to Replace Your Windows: Signs, Costs, and What to Expect

In Edmonton's climate, windows are a critical component of home performance — not just aesthetics. A single-pane window or failed IGU (insulated glass unit) can account for significant heat loss, elevated utility bills, and condensation problems that damage surrounding finishes. Here is how to know when replacement makes sense.

• Condensation or fogging between panes — this means the seal has failed and the argon gas has escaped, eliminating the insulating gap
• Drafts around the frame even with the window closed — indicating failed weatherstripping or frame deterioration
• Frost forming on the interior glass surface during Edmonton winters
• Single-pane windows anywhere in the home — these are functionally inadequate for our climate
• Difficulty operating — windows that require force to open, close, or lock are a security and egress concern

For Edmonton, you want triple-pane windows with a U-value of 0.20 or lower. Look for low-e coatings (Low-Emissivity) which reduce heat transfer, and argon or krypton gas fills between panes. The frame material matters too — fibreglass frames outperform vinyl in our extreme temperature swings.

• Basic vinyl double-pane replacement window: $600–$900 per unit installed
• Mid-range vinyl triple-pane: $900–$1,400 per unit installed
• Premium fibreglass triple-pane: $1,400–$2,200 per unit installed
• Full-house replacement (15–20 windows): $15,000–$35,000 depending on specifications
• Note: Canada Greener Homes Grant (when available) can offset $125–$250 per window

Window replacement is typically done without a building permit if the opening size is unchanged. If structural changes are required to the rough opening, a permit is needed. A good contractor handles this assessment before any work begins.