To answer that question, well it always depends on how unique the key is. Locksmiths can tell you the cost of making your copy once theyve figured out the kind of key youd want to be duplicated. Most single-sided keys cost $1.50 each to duplicate. Double-sided keys (with cuts on both sides of the key) cost more. Unusual, foreign, or high-security keys are also more expensive to duplicate.
There are a lot of new model car keys that includes security features such as microchips which makes it more expensive to duplicate. It usually takes less than 5 minutes to duplicate a regular key and would take longer for the unusual ones.
Master key system allows locks to be operated by completely different keys: an individual key that only operates one lock (or the locks on only one door) and a master key that works on multiple locks. Master key systems are common in businesses or schools where an employee needs a key that works only his or her door and a manager or custodian needs a key that opens many doors.
When it comes to house locks, there are 2 types of deadbolts one is single cylinder and the other is a double cylinder deadbolt. A double-cylinder deadbolt requires a key to lock or unlock the bolt from either side of the door. A single-cylinder deadbolt has a thumbturn on the inside of the door so it can be locked or unlocked from the inside without a key.
When choosing the best doorknob, first you will need to decide what brand and quality doorknob you would like to purchase. You then need to determine the backset you will require. The backset is the distance from the edge of the door to the center of the doorknob. Standard backsets are 2 3/4 inches for commercial doors and 2 3/8 inches for residential doors, however larger backsets are common as well particularly in older homes.