When it comes to home improvement, knowing how to measure for a new door frame is essential. Whether you’re replacing an old door or installing a new one, accurate measurements are crucial for a proper fit. A well-fitted door frame ensures security, energy efficiency, and aesthetics. In this article, we’ll give you through the steps to accurately measure for a new door frame.
Understanding Door Frame Measurements
Before we jump into the actual measurement process, let’s understand the components of a door frame. A standard door frame consists of three parts: the head (top), the jambs (sides), and the sill (bottom). Knowing these parts helps you take precise measurements for your new door frame.

1. Gather Your Tools
To start, gather the necessary tools. You will need a tape measure, a pencil, a level, and a notepad. Having these tools on hand will make the measuring process easier and more accurate.
2. Measure the Door Opening Width
The first step in how to measure for a new door frame is to measure the width of the door opening. To do this, place the tape measure at the inside edge of one jamb and extend it to the inside edge of the opposite jamb. Make sure to take the measurement at three different heights: the top, middle, and bottom of the opening. Record the smallest width measurement. This ensures that the new frame fits snugly in the opening.
3. Measure the Door Opening Height
Next, measure the height of the door opening. Start from the floor to the underside of the head. Again, measure at three points: the left side, center, and right side of the opening. Take note of the smallest height measurement, as this will be essential for a proper fit of your new door frame.
4. Measure the Depth of the Frame
After measuring the width and height, it’s time to measure the depth of the existing frame. To do this, use your tape measure to find the distance from the inside edge of the jamb to the outside edge. This measurement will help you choose the right thickness for the new frame.
5. Check for Plumb and Level
It’s essential to ensure that your door frame opening is plumb and level. Use a level to check the vertical sides of the opening. If the jambs are not straight, this could lead to issues with the new door frame fitting properly. If you notice any irregularities, make a note of them. You may need to adjust the opening or account for these issues when installing the new frame.
6. Account for Expansion and Contraction
When measuring for a new door frame, consider the possibility of wood expansion and contraction due to humidity and temperature changes. It’s advisable to leave a small gap (around 1/8 inch) around the door frame for this purpose. This gap allows the frame to adjust without causing sticking or other issues.
7. Consider the Type of Door
When deciding how to measure for a new door frame, remember to consider the type of door you want to install. Different doors have different thicknesses. Standard doors are usually 1 3/8 inches thick, while exterior doors are often 1 3/4 inches thick. Ensure that your new frame accommodates the door you plan to use.
8. Take Notes of Your Measurements
As you measure, be sure to write down all your measurements clearly. A good practice is to create a sketch of the door opening with your measurements noted next to each dimension. This sketch will serve as a helpful reference when purchasing or building your new door frame.
9. Review Your Measurements
Before finalizing your door frame size, review all your measurements. Double-check that you have the correct smallest dimensions for both width and height. Having precise measurements will save you time and effort when installing the new frame.
10. Seek Professional Help if Necessary
If you’re unsure about any aspect of measuring or installing your new door frame, don’t hesitate to seek professional help. A skilled contractor or carpenter can provide guidance, ensuring that your new frame fits perfectly and meets all necessary building codes.
Conclusion
Knowing how to measure for a new door frame is a crucial skill for any homeowner. By following these steps, you can ensure that your new frame fits correctly, enhancing the appearance and functionality of your door. Accurate measurements are the key to a successful installation, so take your time and do it right. Whether you’re a DIY enthusiast or a homeowner looking to hire a professional, understanding these measuring techniques will set you on the path to success.