To help lock-in the interest rate you want, fill out a mortgage loan pre-qualification application online. The interest rate you are quoted on the day your mortgage loan application is accepted is the rate you can lock-in to, if you choose to do so. You are only able to lock-in your interest rate for a certain amount of time called the lock period. One of our friendly mortgage loan advisors will gladly go over your loan application with you to make sure you have considered all of your financing possibilities and to discuss the lock-in rate and period.