The labor cost to install a kitchen faucet can vary depending on several factors, such as the complexity of the installation, the type of faucet, and your location.  Consulting with a local plumber for an accurate estimate based on your specific situation is the best way to understand the labor required.  In general, there may be water shut-offs, new valves or pipes, water damage assessment from previous faucets, and more if your faucet is outdoor, part of an addition, wall-mounted, or touchless/motion sensor activated.