Instead of hiding the spare key under a doormat, pot plant or other place where it can be easily found, leave a key with a trusted friend or neighbour. Avoid giving keys to tradespersons or people that you don’t know well - copies of keys are quickly and easily made.  

If you lose your keys, consider changing the locks.

Do not mark your keys with your name and address. You can mark your keys using the police property identification system.

Locks may be 'keyed alike' so that one key will open all doors and one key will open all windows.

Make sure you keep keys where you can reach them quickly - for example, in case of fire or other emergency.