How to Replace Casement Windows?

Casement windows are the perfect choice for many homes. They’re often large and airy, allowing lots of light into your living space. But over time, casement windows can leak air and moisture through their old frames or sashes, so it’s crucial to replace them if they need it! In this article, I’ll show you how easy it can be to replace casement windows (and keep the cost down) by following these steps.

How to replace casement windows?

Here are the steps you need to follow:

Measure the windows

Measure the width and height of your window opening. Then, measure the length of the sill or horizontal board on top of or inside the wall framing. Measure this distance with a tape measure to use later when ordering replacement casement windows.

Next, measure how long each side of your jamb (or mullion) is by measuring from one end to another using a tape measure or ruler. Finally, measure how deep your frame is by measuring from one end to another at its center point using either a tape measure or a ruler.

Choose casement window replacement sashes

Choosing the right size sashes for your replacement casement windows will significantly affect how well your new casements operate. You first need to measure the width of your current window and jot down that number. You should also measure the height and depth of each opening (or if they are double-hung) so that you know exactly how much glass needs to be replaced. Once you know this, it’s time to choose new casement sashes based on those measurements.

Casement window sash material matters! You can find them made from wood or fiberglass. Both have pros and cons. Wood casement windows tend to be more expensive. Still, they usually come with better insulation qualities than their fiberglass counterparts. It makes them a good choice if you live somewhere cold or damp like New England, where condensation build-up could become an issue if left unchecked over time.

Remove the old window sashes

To replace casement windows, you’ll need to remove the old sashes. Be sure to check for any nails or screws holding the belt in place. If there are any, use a drill and a screwdriver bit to remove them. The next step is removing the old weatherstripping along the base of each window frame and any other weatherstripping around your home’s doorways and windows that might get in your way while installing new casement windows.

Next comes removing window stops, which hold the window securely in place; this may require some forceful prying if they’re stuck on their tight. After taking care of those pesky window stops (and hoping they don’t end up flying off!), it’s time to tackle lock springs. Those metal pieces with little coils on their ends hold locks into place along the casement frames’ bottom edges. As well as hinges and handles, if necessary before removing them from their current positions at either end of each frame’s side paneling by prying off with pliers or other tools such as chisels that can help break through layers of grime built up over years of neglect; this will hopefully make it easier for you when installing new hardware later down the road!

Install your new casements and weatherstripping

Now that you’ve removed your old sashes and frames, it’s time to install your new ones.

  • Check the fit of each new sash into its frame. If they don’t fit perfectly, adjust them until they’re right.
  • Insert one little screw at a time into every hole in each corner (except for the top of a double-hung window). Try to keep from overdriving these screws so that you don’t crack any wood or break off any heads; this is why we recommend using plastic trim heads instead of metal ones!
  • Contact experts if you’re installing a casement window with an internal locking mechanism.


We hope this article has helped you to understand how to replace your casement windows. If you have any questions, please feel free to contact us.

News Reporter

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