Any other window or point of entry which are accessible, such as those above flat roofs, should also be secure. During the Summer months many of us like windows left open most of the time. Remember this when buying locks so that the window can be locked in the open position. All locks should be secured with screws of an adequate length to prevent them being levered off. External doors, in addition to having a good quality deadlock, should have a door viewer if the glass in the door does not allow the occupant to see who is calling.
Keys allow burglars to open doors and walk away with everything.
Keep keys out of door locks, out of sight. Lighting is also very important both inside your house and out. It is essential that you give the impression that someone is at home. Table lamps can have timed switches plugged in and left on permanently so that, for whatever reason you do not switch your lights on at dusk, they are still activated automatically. Similarly, an exterior floodlight should give lighting to that vulnerable area to the side and the rear of your property to prevent anyone hiding there.