
Styrene windows are twice as strong as standard glass, but garden or allotment sheds see a lot of use, and accidents can and do result in broken panes.
To quickly and safely replace a broken styrene shed window pane, simply follow our step-by-step instructions.
- Remove the framing round the broken window
- Take out the broken pane, being careful to avoid sharp edges
- Make sure the replacement pane is cut to size and put in place
- Insert new window into place
- Re-attach framing
You’ll need:
- Screwdriver
- Replacement pane
- Strong utility knife in case you need to score the pane.
1 - Remove the framing round the broken window

Using a screwdriver, carefully take off the window framing pieces. Take care that broken pieces of window don’t fall.
2 - Take out the broken pane
Remove the broken pane. A styrene window pane won’t have shattered but make sure that you steer clear of any sharp edges.
3 - Make sure the replacement pane is cut to size and put in place.
Offer up the pane to make sure it’ll fit. If you have a styrene pane that’s too big, cut it to size by scoring it heavily with a sharp knife. Line the scored line up with the edge of a workbench and apply pressure. It’ll break with a bang!
If you have a glass pane, head to your local glazier to get it re-cut.
4 - Insert the new pane into the gap
Once you’re sure you have the right size, remove any protective film and put the pane into the gap.
5 - Re-attach framing

Screw the framing pieces back into place. You should be able to use the existing screw holes. Don’t screw too tightly; you risk cracking or breaking your new pane with the pressure!
That’s it - replacing a broken shed window pane is a pretty quick and simple job. Check out the video below to see how we do it at Waltons!