Before quoting a lock change, you need to confirm whether the door takes a mortice lock or will need a surface-mounted one, because the work (and the price) changes quite a lot between the two.
Mortice lock: the most common on wooden doors
It sits inside the edge of the door leaf, in a mortise that must have the right depth and width for the thickness of the leaf. It is the most attractive option, being practically hidden, and the most common on interior and entrance doors made of wood of sufficient thickness.
Surface-mounted lock: when there isn't enough thickness
It is screwed onto the surface of the door, with no need to cut into the edge, which makes it the only viable option on thin metal doors, glass doors with a frame, or doors where the thickness of the leaf doesn't allow a lock to be mortised in without weakening the structure.
Why check the leaf thickness before quoting
Quoting a mortice lock without checking that the door is thick enough can force a change of system halfway through the installation, with the resulting delay and price adjustment. Measuring the real thickness of the leaf before giving a fixed quote avoids that surprise.
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