British Standard Mortice Lock

British Standard Unions % lever mortice lock Bradford
British Standard, 5 lever mortice lock installed.

Not everyone has a UPVC or composite door. So how do we know that the locks in wooden doors are adequate?
Mortice locks (installed in wooden doors) should be a minimum 5 lever British Standard, and will be marked BS3621 and carry the British Standard kitemark. You should find these details on the faceplate as shown in the photo here. Another way to confirm is to measure the bolt, it should protrude at least 20mm when locked.
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