Smart lock factory in Wenzhou, China — samples, OEM and export documents in house.

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How to Measure a Door for a Smart Lock: A Photo Guide

Buyer Guide · Published 2026-10-06

You do not need a technical drawing to order a smart lock. You need the right photos and three measurements, and it takes about five minutes.

The photos

  1. The door edge, straight on, with the existing lock in place and a ruler visible.
  2. The whole door from the inside, so the handing is obvious from the hinges.
  3. The inside face of the lock, so the panel footprint is visible.
  4. The existing mortise body, if one is fitted, from the side and from the face.
  5. The door frame and strike plate.

The measurements

Swipe the table sideways to see the full specification →

Door thicknessMeasured at the lock, in millimetres
BacksetFrom the door edge to the centre of the spindle or keyhole
Mortise bodyLength and fixing centres, or the body code if it is printed on it

What we do with it

We match the lock to the mortise body and the door thickness, confirm the handing and confirm which body the order should include. If the door has already been cut, we confirm whether a standard body fits or whether a non-standard body has to be engineered.

For multi-unit projects

Send the door schedule instead. A schedule with door type, thickness, finish and quantity lets us confirm the whole order in one pass rather than door by door.

Send your measurements and get a fit confirmation

Attach the photos to the quote request and we will confirm the mortise, the backset and the panel before you order.

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