Should I replace windows before or after new siding?

Replace windows first, then install siding. This sequence allows the siding to be properly integrated with the new window frames and ensures better weatherproofing around the window openings.

When you install windows first, the siding contractor can cut and fit the siding precisely around the new window frames, creating clean lines and proper overlap for water management. The window installer will also apply flashing and weatherproofing materials that need to integrate with the building's weather barrier system - work that's much easier to coordinate before siding goes on.

From a practical standpoint, window replacement involves removing exterior trim and potentially disturbing the area around each opening. If you install beautiful new siding first, there's a risk of damage during window installation, plus the window installer may need to remove sections of new siding to properly flash and seal the windows. This creates unnecessary extra work and potential warranty issues.

In Ottawa's climate, proper sequencing is especially important because of our temperature extremes and moisture cycles. The window-to-wall connection needs to be completely weatherproof, with proper flashing that ties into the house wrap or building paper before siding installation. This integration is critical for preventing ice dam issues and moisture infiltration during our harsh winters.

Cost considerations also favor the window-first approach. You'll avoid potential damage charges to new siding, and both contractors can work more efficiently when the sequence is logical. Many siding contractors actually prefer this order because they can achieve better results around the window openings.

For a coordinated approach to your exterior renovation, consider working with contractors who can sequence both projects properly and ensure all weatherproofing details are handled correctly.

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