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What door size do I need?
If you aren’t sure what size door to order, please use the form below to determine what size stock door and frame extensions (if required) you need.
How to measure
As your opening may not be exactly square we recommend taking three measurements. For the width measure top, middle and bottom. For the height, measure at the left, centre and right.
This will allow you to get an accurate measurement of the exact size of the opening the door will fit into. The smallest measurement is the one you should use when calculating the door size needed.
Finally, deduct 5-10mm from the measurements. This allows for a fitting allowance around door and means it can sit square when in place.
View our video on how to measure
Please note:Â This tool has been built using our 2020mm high door sizes. We also offer door sizes which could be more suitable for your opening using 890/990×2095 OR 910×2065 doors. These are external frame sizes and require the additional tolerances of 5-10mm for the width & height.