How to Measure up
for a New Door Size
You don’t want to buy an ill-fitting door, so follow our measuring up guide to make sure that you get the sizes right.
If you are buying replacement doors, DO NOT measure the existing door. You must always base you measurements on the door frame. There is an old craftsman’s expression, “measure twice, cut once”, so please bear this in mind.
Take three measurements inside the door frame - at the top, middle and bottom. The widest measurement determines the width of the door.
Measure the inside of each vertical side of the frame. The longest length determines the height required. Remember to make allowance for any floor covering.
Having gathered your measurements, compare them with the standard sizes available in your chosen door style. Select the most appropriate, remembering that you can plane the edges slightly to reduce the size. If required, please call us for details of the lipping size.
If you have a non-standard door size requirement, call us, as bespoke sizes can be made to order for some of our door ranges.
It is often difficult to understand door sizes and which ones are most commonly available. Read our explanation on UK standard door sizes, hopefully this will help clarify any queries, as well as our handy door size conversion chart for those that prefer to work with imperial measurements.