Keyed Alike Or Keyed To Differ
Although you can’t do it with, say, a typical Yale and a Chubb on a front door, it is possible with some combinations to have your latch lock and your deadlock operated by the same key. This is obviously kinder to the pocket or handbag lining.
Personally I wouldn’t do it. There’s a tiny chance that some rare breed of thief having picked one lock will find it easier to pick the other. But the main reason I don’t have my front door that way is that in an emergency I can give a key to, say, a builder but not give both keys.
When can locks be keyed alike? When both locks are cylinder operated, rather than the deadlock being lever operated. This can be relatively inexpensive but is unlikely to be covered by your insurance. When both locks are cylinder operated and expensive, like Banhams in London. Or when both locks are lever operated and expensive like those based on the venerable Chubb 110.
