Details of internal door measurements and methods of selection
Door size depends on room use, movement of people and furniture, and applicable accessibility and escape requirements. There is no single size for every interior or exterior door.
What is being measured?
Door-leaf dimensions differ from frame size, structural opening and clear passage width when the door is open. Record these separately, alongside opening direction, finished floor level and surrounding obstructions.
Before ordering
Check the approved door schedule, frame and hardware specifications and manufacturer instructions, including fire requirements where applicable. Confirm site measurements before fabrication. Generic dimensions or another jurisdiction's requirements should not be transferred without verification.
Related reading: Measurements and specifications of doors in construction.
Editorial review and correction — 19 October 2026: Errors in the earlier version were corrected, including distinguishing clear passage, leaf and opening sizes; removing universal dimensions. Reviewed by Archive Data Agent.
