A rate lock is a lender commitment to honor specific mortgage pricing for a defined period if stated conditions are met.
Rate lock is a lender commitment to honor a specified mortgage rate and related pricing terms for a defined period, assuming the stated conditions of the lock are satisfied.
Rate lock matters because mortgage pricing can move while the borrower is still in the middle of underwriting and closing. Without a lock, a quote that looked manageable at application could worsen before the deal is ready to fund.
At the same time, borrowers should not treat a lock as magic protection against every possible change. Lock terms have deadlines, conditions, and sometimes feature choices such as float-down options or extension costs.
Borrowers deal with rate lock after choosing to move forward with a lender but before closing. The question is when to lock, for how long, and on what terms.
The lock remains important until funding because the lender has committed to a pricing window only for the defined Lock Period. If closing drifts outside that window, the borrower may need an extension or a different pricing outcome.
A borrower likes a quoted rate and asks the lender to lock it while the file moves through underwriting and appraisal. If market rates rise before closing, the lock can protect the agreed pricing as long as the lock period and conditions are still intact.
Rate lock differs from Lock Period. The lock is the commitment itself. The lock period is the length of time that commitment lasts.
It also differs from Float Down. Float-down is a specific feature that may allow a borrower to improve pricing after locking if market conditions improve, subject to the lender’s rules.