The Lowdown on Locks?
The Short Form

We need locks in many areas of the house, starting at the front door and throughout the interior, for security, privacy and child safety.  However, for the do-it-yourself-er, a trip down the lock aisle of the local home supply store yields a bewildering array of types.   Here's a quick tip from Danny Lipford .com and a snapshot of the basic types of locks and where to put each type to best use.

Exterior Doors
   
  • Deadbolt.   A must-have to maximize home security.  When latched, a bolt that cannot be pried loose extends 1-inch into the door jamb.  Some models come with keys for both interior and exterior, but many building codes have required that the interior side have a thumb lever.
       
  • Mortise lock.  The only alternative to a deadbolt, although a bit more difficult to install.   It combines the high security of a deadbolt with the ease of a latch.
       

  • A Tip From Our
    "Remodleing Go To Guy,"
    Danny Lipford

    "When you buy a lock, don't look for bargains. There might not appear to be differences between a $6 dead bolt and a $16 model. But there are. Stick with a name brand. I've had good luck with Baldwin and Schlage hardware. If you're willing to spend an extra $10, you'll get a dead bolt three times as strong as the economy model".

    Doorknob lock or Entry Lock.    Be sure your deadbolt or mortise lock set includes a keyed doorknob lock.  If not, get a doorknob with its own lock that will fit the set.  The cylinder in this type of lock is stronger than most standard door locks.  When they come in a set, however, one key will operate both the deadbolt and the knob.  
       
  • TIP:  Take your old lock with you when you go to the supply store. Door locks come in various sizes to fit different door thicknesses.

    Privacy Lock
       
  • Typically used on bathroom and bedroom doors.  Be sure to purchase only models that include a small round keyhole on the outside.   
       
  • Builders usually hide the key on top of the outside doorframe.  If none was provided a small nail will do the trick.  
       
  • If there is no key, it?s a god idea to place an appropriate sized nail above all privacy-locked doors in your house for quick access in case of emergency.

    Passage Latch
       
  • Technically this is not a lock at all, but an old-fashioned latch usually used for closet doors.   Some are ornamental and can be bought in a range of period styles.

    Rim Latch
       
  • This is a good news/bed news type of lock.  The good news is that it attaches to the surface of the door, is easy to install, requires no drilling, and locks automatically when the door closes.
       
  • The bad news is that it?s pretty easy to pick.  Not recommended for doors where security needs are highest. 

    Child Safety Latches & Locks
       
  • This inexpensive but invaluable category of locks and latches are for cabinets and drawers in kitchens, bathrooms, and other areas to help prevent poisonings and other injuries.
       
  • Look for safety latches and locks that adults can easily install and use, but are sturdy enough to withstand pulls and tugs from children. Safety latches are not a guarantee of protection, but they can make it more difficult for children to reach dangerous substances. 
       
  • Even products with child-resistant packaging should be locked away, out of reach; this packaging is not childproof.