A secure home is never “absolute.”
There are some things that you as a homeowner can do to make them more resistant to break-in.
While I make no attempt to verify the relative security of a home, one simple thing that I do like to check, is to see if the security pin of the lock-set enters the strike plate on the door jamb. Some lock-sets don’t have a security pin as part of the mechanism and rely on the dead-bolt only. Some doors that have interlocking type weather-stripping are less vulnerable to tampering. The typical steel, aluminum or vinyl insulated doors, with compression-type weather-stripping can almost always be opened with a credit card if the security pin enters the hole in the strike-plate—-if it is an in-swinging type door. The same type of door can often easily be opened with a knife from the outside if it is an out-swing type door. The strike plate can be adjusted to prevent this and repairs should be professionally made. In the picture below, the security pin is the little bump on the right side of the strike-bolt in the edge of the door.
It should also be verified that out-swing type doors have “security-pin” hinges. These hinges have a small set screw that prevents the pin from being removed from the hinges on the outside when the door is locked/closed. It is also good practice for these out-swing doors to have security plates over the latch mechanism to prevent access to the strike bolt from the outside.
If the door has a dead-bolt (or other secondary means of locking the door) the security pin issue is greatly reduced—-but you have to remember to use the dead-bolt.
Can you get in your house with a credit card?
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