We can open most locks non-destructively, and aim to repair rather than replace locks, to keep the cost down when possible. However, due to the security of some locks, sometimes drilling may need to be carried out, this will still be minimal damage and we can fill the hole after.
If you are leaving a property you don’t need to worry about changing the locks as the new homeowner will take care of that. However, if you are moving to a new property you should definitely change the locks! If your house is burgled with a key your insurance won't cover you.