How To Repair A Rotted Exterior Window Sill [verified] Site

The wood is spongy throughout, the rot has spread into the wall studs, or the sill is structural and sagging. Professionals like Argo Window Repair estimate that simple epoxy repairs cost $150–$225, while full replacements can reach $750. Required Tools and Materials

To do the job right, you’ll need materials designed for exterior durability: how to repair a rotted exterior window sill