Give a Neighbor a Spare Key Leave a key with a trusted neighbor in case anything happens to your house while you are away, or in case you get locked out. It's usually not a good idea to leave a key hidden outside your house, especially in more urban areas.

Protect Your House Keys
Don't give repairmen a key, and don't give people fixing your car your whole set of keys. Your house keys can be easily duplicated and your address can usually be obtained from your license plate number.

Change Your Locks
It is usually a good idea to change the locks on your new home when you move in. You never know who might have keys to your house. If your new home does not have deadbolts on all ground-level doors, consider installing them. If a sliding glass door is easily accessible, it is a good idea to put a strip of wood in the lower tract.

Consider Installing an Alarm
You may also want to install an alarm if the house doesn't already have one. If you move into a new house with an alarm, make sure you get accurate (written) directions on how to operate it.

Lock Doors And Windows
Keep your doors locked, even if you step out for just a few minutes. Especially remember to lock all doors at night and when you go on vacation. Similarly, keep your windows locked. Check that all windows have locks when you move into a new house. If they don't, install them or replace the window.