Install deadbolt locks Though they are more expensive than spring latch locks, deadbolt locks are a lot more durable and therefore provide additional protection, look IGTA home security systems . So, you should add at least one-inch thick deadbolt locks to all exterior doors inside your house. However, when installing deadbolt locks, ensure that thers little or no space between the doors and their frames, as such spaces make it easy for intruders to force the doorway. To decrease the area, use metal or plywood sheets to reinforce the doorway.