Rotting wood & your windows: Costs & considerations

December 31, 2025

What you should know about wood rot around your home's windows featured image

Homeowners budgeting for repairs might wonder, “how much does it cost to repair wood rot around windows?” Window
frames are important for insulation, and damaged or rotting wood frames can lead to leaky windows.

No matter the extent of the issue, it’s helpful to know what to expect in terms of repair costs. Here are some of the
key factors to consider when it comes to window frames:

Window frame problems

Wood windows are susceptible to rot if exposed to too much moisture. Not only can a rotted window sill or frame be an
aesthetic problem, it can also pose a risk to the structural integrity of your walls.

Some other common window frame problems include damaged weather seals or warped window panes. Ultimately, any time
there’s excess moisture resting on the frame, you have the potential for leaking, rot or mold.

Window frame repair cost

The cost of repairing or replacing window frames depends on several factors, however the main concern is frame
material. With wood windows, replacement cost for the sill and frame is typically $200-$300. However, depending on
the extent of the rot, the project can get much more expensive.

Since rotting wood needs to be completely removed to prevent spreading, an especially nasty mold problem can mean
replacing more than just your window frame.

Other important factors in determining window frame replacement cost include the size of the window unit, price of
replacement materials and labor. Replacing rotted wood frames with composite material can cost up to $1000 per
window, while new wood or fiberglass frames cost around $200.

What you should know about wood rot around your home's windows infographic

Even if your window frame issue seems small and manageable, it’s best to have a professional handle the repairs. When
it comes to rotting wood, the sooner you call for help, the better – and more affordable.