In this day and age, it's wise to fit an extra lock to your door for better security. A deadbolt is one of the most common methods to use for that purpose. As they're rather difficult to pick, break, or bypass, due to their design and materials. Since they're not spring loaded; once it's locked it will require a lot of effort for anyone to unlock it from the outside. With the exception of possessing the key.

To install a deadbolt lock it requires a bit of hand-eye coordination and patience. Also quite a bit of time. The tools required will vary depending on the door and type of deadbolt you wish to install. The most simple combination is a drill, screwdriver, and drill attachments. The attachments can be a hole saw (5.08cm) and/or a drill bit.

Using these you can fashion the lock into the door by drilling a hole in it and mounting the lock. Then drilling holes for the screws, screwing it on, and finally drilling the hole into the door frame for the deadbolt to fit into. It's recommended that you use exact measurements for best results. It isn't a quick task that should be thrown together with carelessness, as if you don't use proper measurements you might end up with the deadbolt at the bottom of the door with the drill crammed into something to the point of no return.

Deadbolts almost always come with an instruction manual, so there is no need to worry when it comes to exact specifics. They will normally be provided in the instructions for a more directed approach. However to give you a basic idea, the main goal would be to align the deadbolt correctly so it's close to the doorknob for easy reach and will lock properly when you close the door. hopefully causing no interruptions with fluid movements of opening, closing, locking, unlocking, or anything else you may do with a door. You don't want to have measured incorrectly only to have to take out the lock and leave a rather gigantic hole in the door and/or door frame. Or have to buy a new door! That type of mistake would definitely be one you'd regret, since a door is a lot more expensive and time consuming than a simple lock. So be sure you have the patience required, least you end up with property damage instead of security.