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Door width vs. rough opening

See how nominal door size, frame opening, and rough opening relate before you order.

Measure a commercial door openingA hollow-metal door and frame with separate arrows for door width, door height, and the rough opening.Door widthDoor heightRough opening
Step 1 of 4

Step-by-step guide

  1. 1Label the physical door leaf measurement as nominal door size.
  2. 2Label the clear space inside the frame separately.
  3. 3Measure the wall opening from framing to framing for the rough opening.
  4. 4Use the selected manufacturer's frame requirements before construction or ordering.

Transcript

Nominal door size, the opening inside a frame, and the rough opening are not interchangeable. The frame manufacturer and wall condition determine the required rough opening. Record each measurement by name and verify the selected frame requirements.

Technical source: Doors & More opening-size guide