Solid wood or sheet metal faced doors provide extra integrity that a hollow core wooden door cannot. Metal security grates or screens that cover the entire door and frame also provide added security. A steel door frame that properly fits the door is as important as the construction of the door. With the proper foundation of a sufficient door and frame, the most obvious consider-ation, door locks, can be addressed. Long throw dead bolts of hardened steel are excellent deterrents to forced entry.
Many standard locks are easy to pick or break open.
Do remember that exits must remain operable for fire and life safety reasons. Install burglar-proof bars on screens, and large roof vents to prohibit access through them. However, it should be noted that aesthetic or fire safety considerations often preclude their use. If bars are used, they should be operable from interior and not limit exit or evacuation of building. Windows are common points of entry for criminals, regardless of their height from the ground.