Why change the key?
A move, missing key or change in occupants can leave the history of key copies uncertain. Describe that concern directly. Rekeying changes the key arrangement of suitable existing locks; it is not a promise that any installed hardware can be kept or that every door can share a single key.
Our residential locksmith information puts this in the wider home-entry context. A door inventory is more useful than a room count because a home may have several separately keyed entrances.
