How to adding a new lock for the door?
The most likely problem when you add a lock before locking is that every hole you cut will weaken the door. If you want to add a few fixing bolts, even a solid solid door, you will remove a lot of material and then weaken the door. Be sure to install a metal slide and heavy lock to add metal content where large amounts of wood are removed.
Whether your door is new or you want to add another latch to an existing door, it's important to understand the door you are working on. Many doors do not have pre-drilled cross holes for mounting the fixing bolts and do not mean that the deadlock can be fixed. A good example is a hollow door for indoor use.