How many sink holes that you need all depends on what faucets and appliances you intend to have installed in your kitchen. While there are kitchen faucets that only require 1 hole, generally a kitchen faucet with a plate at its base requires 3 holes.or example, if you want a sprayer for your dishes, you will need an extra hole for it. Then, if you have a dishwasher you will need a hole for that as well. This is because 1 hole is required for the air gap.