Installing a new deadbolt lock can improve your home security, especially if you think your current lock system has been compromised or there are unaccounted-for copies of your house keys in circulation. A professional locksmith can install a new deadbolt for you in a matter of hours. The national average locksmith price ranges from $70 to $100. Locksmith prices for installing deadbolts may be higher based on whether the professional provides the lock or you have it on hand, how many components the locking system includes, and how long the installation takes. The cost to purchase a lock yourself from a big-box store can range from approximately $70 to $225 or more, depending on quality and materials. Higher-security locks often take longer and therefore cost more to install.