Ask how long a lock lasts (typically 15–60 days) and if there are associated fees.
Inquire if you can get a lower rate ("float down") if market rates drop before you close. Questions to Ask When Choosing a Lender questions to ask lender when buying first home
The APR includes both the interest rate and the fees required to originate the loan, providing a truer cost of borrowing. Ask how long a lock lasts (typically 15–60