How much does it cost to replace just the glass instead of the whole window?

Glass-only replacement typically costs $150-$400 per window in Ottawa, but this option is only viable in specific situations and often not the most cost-effective choice for older windows.

When glass-only replacement makes sense, you're looking at situations where the window frame is in excellent condition - typically less than 10 years old with no air leaks, smooth operation, and intact weatherstripping. The cost breakdown includes the glass unit itself ($100-$250), labor for removal and installation ($50-$150), and any necessary glazing compound or gaskets. For standard double-pane units, expect to pay around $200-$300 per window, while triple-pane or specialty glass can push costs to $350-$500.

However, glass-only replacement has significant limitations in Ottawa's harsh climate. If your windows are more than 15 years old, the frames likely have efficiency issues that new glass won't solve. The window frame, weatherstripping, and operating mechanisms contribute significantly to energy performance and comfort. Additionally, many older windows use discontinued glass sizes or mounting systems, making glass replacement difficult or impossible.

From a value perspective, when glass replacement costs $200-$400 and a complete new window runs $400-$800 installed, the full replacement often provides better long-term value. New windows come with warranties, improved energy efficiency, and address all potential failure points - not just the glass. In Ottawa's Climate Zone 6, the energy savings from a complete window upgrade typically justify the additional cost within 5-7 years.

For the best assessment of your specific situation, have a licensed installer evaluate whether your window frames can support glass-only replacement and if it makes financial sense compared to full replacement.

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