How to install a new window

Are you looking to bring more natural light into your home or to replace an old, worn out window? Installing a new window can be a rewarding DIY project that enhances both the aesthetics and energy efficiency of your space.

Here, we'll guide you through the process step by step, ensuring a successful window installation.

Tools and Materials You'll Need

A replacement new window – naturally - safety goggles and gloves, Screwdriver, pry bar, which is similar to a crowbar, a measuring tape and a level

You will also need Shims - Shims are usually evenly spaced at the bottom, sides and top of the window. Shims at the bottom of the window also carry the weight of the window. These must be spaced according to manufacturer instructions to distribute the weight so the bottom of the frame is not distorted

Don’t forget you will also need a caulk gun and silicone caulk, insulation foam, nails or screws and a hammer or screwdriver (depending on fasteners).

Step 1: Safety First

Before starting any DIY project, prioritise safety. Put on your safety goggles and gloves to protect your eyes and hands throughout the installation.

Step 2: Remove the Old Window

Carefully remove the interior trim around the old window using a pry bar and screwdriver. Set the trim aside, as you may want to reuse it later. Using the pry bar, gently remove the old window frame from the opening. Clean the opening and remove any debris or old caulk.

Step 3: Measure and Prepare

Measure the width and height of the window opening at multiple points to ensure accuracy. Check that the new window's size matches the measurements. If necessary, trim the window or adjust the opening accordingly.

Apply a bead of silicone caulk around the inside perimeter of the window opening. This will create a seal to prevent drafts.

Step 4: Install the New Window

Carefully position the new window in the opening, ensuring it's cantered and level. Insert shims under the window to provide support and to keep it level. Use a level to check for evenness.

Secure the window in place by driving nails or screws through the frame and into the surrounding wall studs. Be cautious not to overtighten and distort the window frame. Apply a second bead of silicone caulk around the exterior perimeter of the window to seal any gaps.

Step 5: Insulate and Finish

Fill any gaps between the window frame and the wall with insulation foam. This will enhance energy efficiency. Reattach the interior trim, securing it in place with nails or screws. Clean any excess caulk or foam for a neat finish.

Once everything is secure, apply a final coat of paint or stain to the trim to match your interior.

Step 6: Test the Window

Operate the window to ensure it opens, closes, and locks properly. Check for any drafts or air leaks around the window.

Congratulations! You've successfully installed a new window, adding both functionality and aesthetic appeal to your home. Properly installed windows can improve insulation and save on energy costs, making this DIY project a valuable investment in your home.