How to build a window frame

Some home improvement projects are relatively easy and cheap when you do it yourself. Building a window frame falls among such projects since you require a few materials. You also get to create a personalized window frame to suit the aesthetics in your home. If you are ready to start your project, below is a step by step instructional on how to build a window frame.


  • Hammer
  • Nails
  • Wood glue
  • Table saw
  • Measuring tape

Step 1: Take measurements

Understand that you need to measure the entire opening of your window. These measurements will ensure that you have a suitable window frame. You, therefore, must be extremely accurate during this step.

Measuring the width requires you to start inside the drywall and move across to the stud’s exterior side. For the length, on the other hand, start at the bottom stud and move to the top stud.

Step 2: Cutting the widths and lengths

You need two pieces of lumber to create the width and two more pieces to create the length of your new window frame. Both the length and width measurements need to be cut minus 3/8-inches from the original measurements.

Once you have all the lengths and widths cut using a table saw, the next step is cutting corners. Use a 45-degree angle to cut corners on all the pieces of wood. The 45-degree angle ensures that you get the frame done right.

Step 3: Attach the window frame

To design the window frame, you need to dry-fit the four pieces of wood. Use glue to ensure that the structure is firm and robust. In some instances, you might need to use clamps for a firmer hold. This is especially true when you didn’t get the 45-degree angles right. However, once the glue is dry and the pieces stay together, then you can remove the clamps.

Step 4: finishing touches

Use a hammer and nails to ensure that the corners of your new window frame hold firmly. Understand that you need a sturdy window frame that is both long-lasting and top quality.

If you are thinking of adding decorative features such as wood molding, then you can proceed to the next steps.

Step 5: Adding wood molding

Depending on where you want your new window frame to go, you might need to add a few decorative features. The wood molding cross has to be placed in the middle of your new frame. Start by measuring the length and width of your window frame.

Step 6: install the molding pieces

Use the taken measurements to cut the pieces of molding. Ensure that they fit inside the window perfectly. Proceed to Install the overlapping molding pieces in place using the glue. Proceed to use your hammer and nails to secure the molding pieces to your new window frame firmly.


Building a window frame is made simple thanks to the above step by step guide. When on a budget, it is cheaper to build your window frame as you have realized.

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