First, you have to make sure your exterior door is strong enough to hold off any potential intruders or robbers. Wooden, metal and fibreglass doors with solid cores are readily available in the market and considered to be the strongest ones. You can install any of these types of doors at your house.
Make sure your exterior door does not have any glass windows in it as it can be broken easily by a robber and they can breach your premises.
You have to ensure that the hinges are on the inside of the door and not on the outside. An intruder might remove the hinges to set aside the entire door if they are located on the outside.
Replace the pins of the door hinges with the non-removable ones so that no one can remove the entire hinge.
Make sure to lock your exterior door every time you leave the house. About 12 percent of robberies occur due to unlocked front doors and you should not fall victim of such a grave mistake.
It is better to replace the conventional deadbolts of your front door with high quality modern types to increase the safety of your house.
The metal strike plate where the deadbolts piece goes should be replaced by a heavy duty version to increase the strength of your door.
Strengthen the door frame by replacing the nails in the frame mouldings with 3-inch screws.
It is highly recommended to install a wide-angle peep hole in the door. It should be at your eye level so you can easily view the person outside your door.