Call Sash Windows Berkshire Anytime for Top Quality, Great Value Sash Windows Solutions on 0118 449 2798

We are here for all you Sash Windows Service needs in Berkshire.

How To Replace A Sash Window Sill in Reading

Sash Windows Berkshire is a window sash replacement company in Reading that has been providing high-quality services to customers for several years. We understand the importance of maintaining your windows, especially when it comes to the window sills.

A window sill is the bottom part of a window frame that projects horizontally from the wall of a building. Window sills are essential for preventing rainwater from entering the interior of a building, and they also provide a platform for plants and decorations.

Over time, window sills can become damaged due to weather conditions, moisture, or pests. If your window sill is damaged, it can affect the overall appearance and functionality of your window. It is crucial to replace a damaged window sill promptly to avoid further damage to your property.

In this article, we will explain how you can replace a sash window sill in Reading. You do not need any professional skills or equipment to carry out this task, but it is still essential to take appropriate safety precautions.

What Do You Need?

Before starting the process, you will need to gather the following tools and equipment:

  • A hand saw
  • A chisel
  • A hammer
  • A pry bar
  • A screwdriver
  • A measuring tape
  • A wooden sill
  • Wood filler
  • Sandpaper

Step-by-Step Instructions

  1. Remove the Window Sash

The first step is to remove the window sash, which is the movable panel that holds the glass. To remove the window sash, you need to access the pulley on the side of the window frame. Using a screwdriver, remove the screws that hold the cover plate of the pulley. Then, detach the cord of the sash from the pulley and take the sash out of the frame.

  1. Cut the Damaged Sill

Once you have removed the window sash, you need to prepare the damaged sill for replacement. Using a hand saw, cut the damaged or rotten part of the sill. Make sure to cut along the length of the sill and avoid damaging the surrounding frame.

  1. Remove the Damaged Sill

Using a chisel and a hammer, remove the cut portion of the damaged sill. Be careful not to damage the surrounding frame or any other parts of the window.

  1. Prepare the New Sill

Measure the length and width of the new sill to fit the opening left by the removed sill. Using a hand saw, cut the new sill to size. Once you have cut the new sill, apply a coat of wood preservative to prevent moisture damage.

  1. Install the New Sill

Place the new sill into the opening and align it with the surrounding frame. Using a pry bar and a hammer, tap the sill into place, and make sure it is level. Then, attach the new sill to the frame by nailing it in place.

  1. Seal the New Sill

Using wood filler, fill any gaps or holes left around the new sill. Once the wood filler is dry, sand it down to create a smooth and even surface.

  1. Replace the Window Sash

Finally, you will need to reinstall the window sash. Insert the cord of the sash into the pulley and attach it to the sash. Test the window sash by opening and closing it to make sure it works correctly.


Replacing a sash window sill might seem like a daunting task, but it is relatively simple and straightforward. As a window sash replacement company in Reading, Sash Windows Berkshire has helped several customers with their window sill replacements.

By following these step-by-step instructions, you can replace a damaged or rotten window sill without the need for professional help. However, if you feel unsure about the process or lack the necessary tools, feel free to contact us at Sash Windows Berkshire for assistance.

Call us on 0118 449 2798 or email us at [email protected] for more information. You can also visit our website at to learn more about our services.

Window Sash Replacement Related Questions