Adding door bolts across your door adds extra security and safety when you are in your home. Most will simply be screwed across the door and the doorway, with some drilling needed to make the screw holes for a new set of bolts to be fitted. If you have a current set of bolts that need replacing then your tradesman may make new screw holes in the door and the frame, or strengthen the screw holes that were used for the previous bolt. This is a very short job for any competent tradesman.
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