How to measure your internal doors and frames

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.

Door Width
Take three measurements inside the door frame - at the top, middle and bottom. The widest measurement determines the width of the door.


Door Height
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.