Measure before you cut
Backset is the distance from the door edge to the centre of the bore, and it has to match the lock. Door thickness decides the screw length and the cylinder tailpiece. Get either wrong and the lock binds from day one. A careful lock installation Toronto technician checks both, plus the frame's square, before a hole saw comes out of the case.
- Backset confirmed
- Door thickness checked
- Frame squareness assessed