Window replacement in London typically costs $400 to $1,200 per window including installation, depending on window size, style, and energy efficiency rating. A full home window replacement (15 to 20 windows) often runs $8,000 to $20,000. Door replacement ranges from $500 to $3,500 per door. Many London homeowners qualify for provincial or federal energy efficiency rebates on qualifying window upgrades.
Replace windows when you notice condensation forming between the panes (indicating a failed seal), drafts around the frame, difficulty opening or closing, visible rot or deterioration in the frame, or significantly higher heating and cooling bills. Single-pane windows are highly inefficient in London's climate and are strong candidates for upgrade.
Replacing windows and doors in the same opening (like-for-like) typically does not require a permit in most Canadian municipalities. Creating a new opening or enlarging an existing one usually does. Structural door replacements may also require a permit. Your installer should confirm the local requirements before beginning work.
For London's climate, look for triple-pane windows with an Energy Star certification rated for Zone 3 or Zone 4 (the Canadian prairie and northern zones require the highest performance). Key ratings to compare are U-factor (lower is better), Solar Heat Gain Coefficient (SHGC), and Energy Rating (ER). A qualified window supplier can recommend the right product for your specific home orientation.
An experienced window installation crew can typically install four to six windows per day. A full home of 15 to 20 windows usually takes two to three days. Individual door replacements take two to four hours each. Weather permitting, crews try to keep open wall time to a minimum in London's climate to prevent heat loss and moisture intrusion.
