Accurate measurements are essential for fitting internal doors, ensuring they operate smoothly and fit securely within the frame. This guide provides step-by-step instructions on how to measure your internal door frame correctly, helping you achieve a perfect fit whether you’re a DIY enthusiast or planning to hire professional door fitters. 

Tools You'll Need: 

Measuring tape 
Pencil and paper 
Spirit level (optional, but helpful for checking straightness) 

Step 1: Measure the Door Width 

To measure the width of your door frame accurately, you need to take three measurements: one at the top, one in the middle, and one at the bottom of the frame. Door frames can warp over time, causing variations in width, so taking multiple measurements helps ensure accuracy. 
 
1. Top Measurement: 
 
Place the measuring tape at the top of the door frame. 
Measure the distance from one side of the frame to the other. 
Write down the measurement. 
 
2. Middle Measurement: 
 
Measure the width at the middle of the door frame. 
Ensure the tape measure is straight and level. 
Record this measurement. 
 
3. Bottom Measurement: 
 
Finally, measure the width at the bottom of the door frame. 
Note any differences compared to the top and middle measurements. 
 
By taking these three measurements, you can identify any discrepancies in the frame's width. Use the smallest measurement when selecting your door to ensure it will fit the narrowest part of the frame. 

Step 2: Measure the Door Height 

Next, measure the height of the door frame. Like the width, you should take multiple measurements to account for any irregularities. 
 
1. Left Side Measurement: 
 
Start at the bottom left corner of the door frame. 
Measure vertically up to the top of the frame. 
Write down the height. 
 
2. Right Side Measurement: 
 
Repeat the process on the right side of the door frame. 
Record this measurement as well. 
 
If there is a significant difference between the two measurements, use the shorter height to ensure the door fits properly. 

Step 3: Account for the Door Rebate 

The rebate is the part of the frame into which the door sits when closed. It’s crucial to measure this depth accurately to ensure the door will fit snugly. 
 
Rebate Depth Measurement: 
Measure from the leading edge of the frame into the rebate. 
A typical rebate depth is around 35mm, but this can vary. 

Step 4: Allow for Flooring 

When measuring for your door, consider the type of flooring you have or plan to install. Different flooring types (such as carpets, tiles, or hardwood) will affect the clearance needed at the bottom of the door. 
 
Floor Clearance: 
Measure the thickness of your flooring. 
Ensure there is adequate space for the door to swing freely over the flooring. 
 
Remember, you can always trim the bottom of a door to make it fit, but adding material to increase the door's height is not feasible. 

Step 5: Verify Measurements 

If you’re unsure about your measurements or want professional assurance, consult with door fitters. They can provide expert advice and may offer measuring services to guarantee accuracy. 
 
Additional Tips: 
Use a Spirit Level: For more accurate measurements, especially for older frames that may not be perfectly square. 
Document Everything: Keep a record of all your measurements and take photos if necessary. This can be helpful when consulting with professionals or shopping for doors. 
Consider Professional Installation: Door fitters have the experience and tools to ensure a perfect fit, saving you time and potential frustration. 

Step 6: Consult with Door Fitters 

CMeasuring your internal door frame accurately is the first step toward a successful door installation. By following these steps and ensuring precise measurements, you can achieve a perfect fit for your new door. Whether you're doing it yourself or working with professional door fitters, taking the time to measure correctly will result in a smoother, more secure installation. 
 
For more information and to explore a range of quality doors, visit Doors 4 Yours
 
Visit our online store to explore our extensive selection of internal doors, book your free home measure up or visit our showroom in Hyde, Manchester. 
 
 
Tagged as: Measure Doors
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