I hired to fix a deep crack in my front window sill. The wood had split from weather exposure and was starting to rot. They didn’t try to sell me a full replacement – instead, they cleaned out the damaged area, used a high-grade epoxy filler, and reshaped the sill. After sanding and priming, you can barely tell it was ever cracked.
How to Repair a Cracked Window Sill: A Step-by-Step Restoration Guide repairing cracked window sill
If the crack indicates deep structural failure or advanced rot. I hired to fix a deep crack in my front window sill