How to Fix a Cracked Window

Updated: Jun. 04, 2023

The keys to success here are a good putty knife and a quality glazing compound.


An hour or less






Unlike your car's windshield, when a windowpane in your house cracks, the only repair is to replace it. For single pane glass, it's a pretty easy fix. Just order a piece of glass from your neighborhood hardware store, grab some glazing points and glazing compound and you're ready to get started.

Tools Required

  • Putty knife
  • carbide scraper
  • Utility knife
  • Caulking gun

Materials Required

  • Glass
  • Glazing points
  • Glazing putty (oil or latex)

Project step-by-step (5)

Step 1

Remove the Glass

  • Chip out all of the old glazing compound with a putty knife. Really old glazing compound like this chips out pretty easily. Here are a few tips for glazing a window.
  • Remove the glazing points that hold the glass in place, and then pull out the glass.

Step 2

Clean the Seat

  • Clean out any remaining glazing compound using a carbide scraper or chisel, taking care not to gouge the wood.

Step 3

Set the New Glass

  • Tilt the new pane into place, verifying that it fits and that it’s completely flat against the wood seat.

Step 4

Secure the New Glass

  • Secure the new pane with glazing points.
    • Note: I like the kind with tabs, allowing me to push them in with a putty knife.

Step 5

Seal the Glass

  • Apply new glazing compound around the new pane, creating a beveled profile that looks tidy and sheds water.
  • Glazing compound comes either as a putty or in a tube, as shown. Both are relatively easy to use, but require a little practice to get a nice looking bead.