What changes before, during and after the decision
A lock protects the quoted rate only for its stated period and assumptions.
A delayed closing can create an extension cost or require new pricing.
Compare lock length, points, credits and extension policy together.
What a rate lock actually does
A mortgage rate lock is a lender commitment to hold a specified interest rate for a defined period while the loan moves toward closing. It is not a guarantee that the loan will be approved or that every cost will stay unchanged. A change to the loan amount, property, occupancy, credit profile or other application details can lead to revised pricing under the lender's policy.
A lock covers the quoted rate for a stated period under stated assumptions. It does not approve the loan or freeze every charge. Ask which changes to the borrower, property or loan can trigger revised pricing.
Find the lock on the Loan Estimate
Page one of the Loan Estimate shows whether the rate is locked, the date and time the lock expires, and whether estimated loan costs are locked. Read those fields before comparing the headline rate. Two offers with the same rate are not equivalent when one lock is too short for the expected closing schedule or requires more points.
Read the exact expiration date and time on the disclosure. Compare two offers only after checking whether both locks last through the expected closing schedule and whether points or credits differ.
Match the period to the closing plan
Ask the lender and closing team for a realistic timeline, including appraisal, underwriting and title work. Leave room for known risks such as repairs or document delays. A longer lock can carry different pricing, but an unrealistically short lock can expose you to an extension charge or a new market rate near closing.
Build margin for appraisal, title, underwriting and repair delays. Ask for extension pricing and any float-down terms in writing before choosing the lock length, then save the confirmation with the Loan Estimate.
Ask four questions before locking
Confirm who decides when to lock, what changes can invalidate the lock, what an extension costs, and whether any float-down option exists if market rates fall. Get the answers in writing. Then compare the locked APR, points, lender credits and cash to close - Not the interest rate by itself.
Before locking, identify who submits the request and when it becomes effective. A verbal discussion of rates is not the same as a confirmed lock. Recheck the final Closing Disclosure against the agreed terms.
Choose a lock by schedule risk
A cheaper short lock can be false economy when the closing plan has little margin.
| Situation | What to do next |
|---|---|
| Closing date is firm and near | Compare locks that safely extend past the scheduled date. |
| Appraisal or repairs remain | Ask about a longer lock and extension pricing. |
| Application details may change | Ask which changes can trigger repricing. |
Build the plan before the deadline
The timing plan in one view
A lock protects the quoted rate only for its stated period and assumptions.
Closing date is firm and near: Compare locks that safely extend past the scheduled date.
Keep the date, time, time zone and required closing condition with the quote. A vague promise that a rate is locked is not enough to compare offers.
Primary sources
- CFPB: What is a mortgage rate lock?Official reference ↗
- CFPB: Loan Estimate explainerOfficial reference ↗
Answers to check before you act
Can a locked mortgage rate still change?
It can if the lock expires or important application details change under the lender's policy. Ask for the specific lock conditions in writing.
Does a rate lock protect closing costs?
Not necessarily. The Loan Estimate indicates the rate-lock status, while other charges can have separate tolerance and change rules.