This is part of my business, particularly with elderly people, helping make their homes more secure. I agree with both Bob's and Bud's suggestions. Bob's suggestion is very noteworthy, whenever I add or replace a dead bolt I always use longer screws on the strike plate with intentions of getting into the framing behind the door jamb where the strength is. Note that Bud suggested "slide bolts" and not the chain latches, the less that door can move initially, the less chance of unwanted entry. Again use the longest screws you can without going through the door, and long screws into the casement which will go on into the framing, hopefully. Another item I recommend, and is inexpensive, is a device (sort of a round metal stick) that goes under your doorknob, on the inside, and has a foot that has a serrated rubber bottom. This device is adjustable for different knob heights, the foot grips carpet, linoleum, and hardwood floors. I've tested these on all of these floors and they work. I've even had the local police give me their opinion-on the job and they recommend them. It's hard for anyone to break down a door with one of these on it. The force is intended to be transferred to the floor. The more resistance, the less likely an intruder will fight the door. They are easily put in place by the elderly. I even place two of these withing a home occupied by a lady in a wheelchair and scooter. I made sure she could put them in place and remove them when needed before I let her pay me for them. NO CHARGE for installation for the elderly, they (and soon to be me) have enough problems. These are found at Lowe's and Home Depot I know, and are around $25 each. I hope all of these ideas help, Thanks, David
