How to Measure Your Internal Doors Correctly Before Ordering Online
When ordering internal doors online, accuracy is key. Getting your measurements right ensures a perfect fit, smooth installation, and long-lasting results. At The Door Line, we make it easy — offering not just high-quality LPD internal doors, but also a turnkey supply, measurement, and fitting service across Leeds and West Yorkshire.
This guide walks you through exactly how to measure doors, frames, and walls before you buy, helping you avoid costly mistakes and ensuring your new doors look and perform beautifully.
Why Measuring Your Internal Doors Correctly Matters
Every property is different — particularly older homes where frames may have shifted or been altered over time. Measuring carefully ensures your new internal doors fit properly and function as they should.
If you’d rather leave the measuring to the experts, The Door Line offers a professional pre-order measurement service in Leeds and across the UK. We’ll send experienced joiners to measure your door frames precisely and make sure your new LPD Doors fit perfectly.
What You’ll Need Before You Start
To get accurate measurements, you’ll need:
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A metal tape measure
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A notepad or smartphone to record measurements
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A spirit level to check frame alignment
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(Optional) A helper to hold the tape steady
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Step-by-Step: How to Measure for Internal Doors
1. Measure the Width
Measure the door frame width in three places — top, middle, and bottom.
Record the narrowest measurement to ensure a good fit.
Typical UK internal door widths:
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610mm (24”)
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686mm (27”)
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762mm (30”)
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838mm (33”)
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926mm (36”)
Pro Tip: If your frame doesn’t match a standard size, The Door Line can supply custom-size internal doors to suit your home.
2. Measure the Height
Measure from the top of the frame to the floor on both sides of the door opening. Floors can be uneven, so again — take the shortest measurement.
Standard UK internal door heights include:
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1981mm (6’6”)
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2032mm (6’8”)
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2040mm (metric)
If you’re planning to add new flooring (carpet, laminate, tiles), measure after installation or allow clearance for thickness.
3. Measure the Door Thickness
Measure your existing door’s thickness — this helps ensure hinges, latches, and handles align correctly.
Most standard internal doors are 35mm thick, while fire-rated doors (FD30) are typically 44mm thick.
⚠️ If you’re upgrading to fire doors, make sure your frame and hardware are also fire-rated for full compliance.
4. Check the Frame and Opening
Inspect your door frame for any damage, gaps, or warping. Even small imperfections can cause a poor fit.
If you’re unsure, our joiners can carry out a door frame inspection and recommend whether it needs replacing before installation.
5. Decide on Door Swing and Hinge Position
Determine whether your door will be left-hand or right-hand hung, and whether it will open inwards or outwards.
When ordering online, this ensures your door leaf and hinges match your room layout perfectly.
Prefer a Professional Measurement? We’ve Got You Covered
If measuring feels daunting, leave it to us. The Door Line offers a door measurement and fitting service across Leeds, West Yorkshire, and nearby areas.
Our experts will visit your property, take precise measurements, recommend suitable LPD internal doors, and provide a supply and fit quotation — all in one visit.
Why Choose The Door Line?
✅ Based in Leeds — local experts with nationwide delivery
✅ Proud suppliers of LPD Doors, the UK’s leading manufacturer
✅ Turnkey supply, measure, and fit solution for homes and landlords
✅ Wide range of oak, white, and glazed internal doors
✅ Professional installation by trusted joiners
Final Tips for Ordering the Right Size Door Online
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Always measure twice to confirm accuracy
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Record measurements in millimetres (mm)
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Allow for new flooring or skirting adjustments
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Check door hardware compatibility (handles, hinges, latches)
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Unsure about sizing? Contact The Door Line — we’re here to help
Ready to Get Started?
Explore our full range of LPD internal doors — from modern oak doors to white shaker and glazed options — all available to order online with delivery across the UK.
