What happens if they pull out the old window and find a bunch of rotted wood?

Rotted wood around window openings is a common discovery during window replacement, especially in Ottawa's freeze-thaw climate. Your installer should stop work immediately to assess the extent of damage and develop a repair plan before proceeding with the new window installation.

Structural Assessment and Safety
When rotted wood is discovered, a good installer will first determine if it's cosmetic damage to trim pieces or structural damage to the window frame, sill plate, or wall framing. Structural rot requires immediate attention since it affects the building's integrity and the new window's proper installation. The installer may need to remove additional materials to fully expose the damaged area and ensure all compromised wood is identified.

Repair Process and Materials
Rotted wood must be completely removed and replaced with new lumber treated for moisture resistance. In Ottawa's climate, installers typically use pressure-treated lumber for sill plates and areas prone to moisture exposure. The repair work includes proper flashing installation, vapor barrier replacement, and insulation upgrades to prevent future moisture problems. This additional work requires time for materials to be sourced and may extend your project timeline by several days.

Cost Implications
Wood rot repairs are typically charged separately from window installation since the extent can't be determined until removal begins. Minor trim rot might add $200-500 to your project, while extensive structural repairs can add $1,000-3,000 or more depending on the damage. Most reputable installers will provide a detailed estimate for the additional work before proceeding, and this repair work may require building permits if structural elements are involved.

Prevention for the Future
Proper installation of your new windows with quality flashing, sealants, and drainage systems will prevent future rot issues. Your installer should also check for and address the original cause of moisture intrusion, whether it's poor exterior caulking, inadequate flashing, or ventilation problems.

For peace of mind with unexpected repairs like this, choose experienced installers who can handle both window installation and necessary carpentry work. Want to discuss potential scenarios for your specific project? Ask about this when you get your quote through Ottawa Window Pros - a good installer will tell you upfront how they price rot repair if they find it.

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