By Gene and Katie Hamilton

Locksmith

You can find a locksmith under "Locks and Locksmiths" in the Yellow Pages. To find a locksmith online type "locksmith in (your town)" in the search box of any search engine. There is often economy in numbers when hiring a professional tradesman so if you want to replace any other locks in the house, the smart money says do it at the same time while you have a locksmith on site. Expect to spend $35 to $65, the national average hourly rate for a locksmith.

To take advantage of their expertise, choose a lock sold by the locksmith instead of purchasing one from another source. Most of them know the intricacies of the line of locks they and their expertise is what you're paying for.

A lock can also be installed by a carpenter or handyman, who has the carpentry skills to replace an existing lock or install a new one.

Click Doors to compare how much it costs to do-it-yourself with hiring a contractor for 28 projects.