If you are looking to replace one or more of your internal doors, it’s often not just about practicality. The right style of internal door will subtly transform and enhance your space, improving the flow between your rooms, and selecting the right type (such as natural and high quality oak) will add a fresh layer of character and gentle warmth to the space.
Before you decide on the perfect style, there’s an essential first step: measuring your doorway. Taking accurate measurements will ensure that your new door will sit beautifully within the frame, open and close effortlessly, and feel as though it has always belonged there.
Here are some top tips to help you measure your doorway with confidence, helping to make your door replacement feel simple and stress-free. With the right measurements to hand, you’ll be ready to choose a door that not only fits perfectly, but suite your space perfectly and enhances the look, feel, and functionality of your space for years to come.
The Easy Way to Measure Up for your New Door
Step 1: Door Width
Measuring the width of your doorway will ensure you achieve a well aligned and snug fit. The following method will help you get the precise measurements you need.
- Use a Tape Measure: Start by taking a tape measure and measuring the existing door or the space where the door will go.
- Measure in Three Places: It's vital to measure the width at the top, middle, and bottom of the door space. Variations in measurements can occur due to uneven frames or wear and this will ensure accuracy when you select your door.
- Use the Widest Measurement: The widest of these three measurements is the one to use when selecting your new door.
Note: Our doors are generally measured in centimeters. However, we suggest you measure in both centimeters and inches, so you have these ready when ordering a door.
Why Width Measurement Matters:
- The right measurements will ensure a door fits without sticking or having gaps.
- Careful measuring with consider any unevenness in older door frames.
Step 2: Door Height
Similarly to width, measuring the height, is just as important as the width to achieve a seamless fit.
- Measure From the Floor to the Top of the Door Frame: Using a tape measure, measure the height of the door space from the floor to the top of the frame.
- Measure at Three Points: As done previously with width measurement, measure at the left, centre, and right sides of the frame.
- Use the Longest Measurement: The tallest measurement out of the three is your go-to number for height.
Note: It is important to measure height accurately because this will prevent your new door dragging on the floor or having a large gap at the top. It also addresses any discrepancies in floor level or frame alignment.
Step 3: Door Thickness
The thickness of your door is a less obvious but equally important dimension to measure.
- Use a Standard Tape Measure: Carefully measure the thickness of the existing door. This is usually done at the edge of the door where it meets the frame.
- Ensuring Frame Fit: The correct thickness ensures your new door will fit into the existing frame without any issues.
Note: Measuring door thickness ensures seamless operation and proper fit within the frame. Critical for the door's alignment and locking mechanisms.
Step 4: The Door Swing
Understanding the swing of your door is crucial for installation.
- Determine Swing Direction: Observe and note if your door swings to the right or the left when opened. This is typically viewed from the outside or the most used side.
- Right-Hand or Left-Hand Swing: This will influence the type of door you need and how it will be hung.
Note: You need to understand the door swing before you choose a door because this effects the choice of door handles and hinges. It is also essential for functional door installation and usage.
Step 5: Aligning the door
A well-aligned door frame is key to a well-fitting door. This is why we need to check the frame for for Square, Level, and Plumb
- Frame Alignment: To check that the door frame is square. You can use a spirit level or a laser level for accuracy, the spirit will indicate if straightness of the frame.
- Dealing with Uneven or Non-Square Frames: If you find that a frame is not perfectly square, opting for a slightly smaller door may be the solution, which can then be trimmed for a perfect fit.
Checking Frame Alignment:
- Ensures the door hangs straight and closes properly.
- Identifies any need for frame adjustments or a custom-sized door.
Step 6: Final Checks
Before you make your order, here are some final checks:
- Double-Check Measurements: It’s always better to measure twice and order once.
- Consider Irregularities: Any deviations in your measurements should be taken into account. When in doubt, consulting a professional is advisable.
Last-Minute Verifications:
- Guarantees accuracy in your order.
- Reduces the likelihood of errors and subsequent adjustments.
Conclusion
Measuring for a new internal door might seem daunting, but with these straightforward steps, you can achieve accuracy and ensure a perfect fit. Remember, each measurement plays a vital role in the overall functionality and appearance of your door. For a diverse range of quality internal doors, explore the collection at UK Oak Doors, where style meets precision.
Frequent Questions when Measuring Doors:
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Is there a standard size for internal doors in the UK?
Standard internal doors in the UK usually measure 1981mm in height and 762mm in width. However, sizes can vary, so it's important to measure your specific doorway for the best fit.
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Can I trim an internal door to fit my doorway?
Yes, solid wood doors (including oak) can often be trimmed to fit. However, be mindful that this has to be done with great care and there's a limit to how much you can trim without affecting the door's structure. Always check the trimming guidelines and seek guidance for your specific door model.
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How do I measure a door frame that isn't square?
If your door frame isn’t square or is irregular, measure the width and height at multiple points and note the smallest measurements. You might need a slightly smaller door that can be trimmed for a precise fit.
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Do I need to consider the door swing direction when ordering a new door?
Yes, knowing whether you need a right-hand or left-hand swing door is crucial for installation, especially for pre-hung doors or those with pre-drilled hardware holes.
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What should I do if my measurements are between standard door sizes?
If your measurements don't match standard sizes, ordering a bespoke door may be the best option for you. UK Oak Doors offers a variety of custom sizes to ensure a perfect fit for your space.

