Not every client on a tight budget needs a new armoured door: in many cases, reinforcing the existing door with additional elements notably improves security at a fraction of the cost.
Independent additional deadbolt or bolt
Adding a security deadbolt independent of the main lock (operated by its own key or from inside) forces a break-in attempt to defeat two different systems instead of one, multiplying the difficulty and the time needed to force the door.
Frame and hinge reinforcement
Reinforcement plates on the frame, in the area where the lock engages, and anti-lever hinge bolts (which prevent the door being lifted off its pins even if the hinges are forced) are relatively cheap upgrades that reinforce exactly the usual weak points of a conventional door.
Digital peephole and security chain
Although they aren't locking elements, a digital peephole with camera and a chain or security bar to open the door slightly under control add a practical layer of security against entry attempts using false identification, complementing the other reinforcements.
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