Mortgage rate locks: compare the deadline and the full cost
Understand what a mortgage rate lock protects, when it expires and how extensions, points and changed loan assumptions affect the offer.
What matters before you decide
A rate lock generally protects the quoted interest rate for a specified period if the loan and application conditions remain as agreed. Ask for the written expiration date and time, points, lender credits, extension cost and consequences of changed terms. Compare offers using the same loan scenario and enough time to reach closing.
- Confirm whether the Loan Estimate says the rate is locked.
- Write down expiration date, time and time zone.
- Compare points, credits and cash to close together.
- Ask who pays if the closing is delayed.
Read the lock separately from the headline rate
Check the first page of each Loan Estimate for rate-lock status and expiration. A quoted rate without a lock can move. A locked rate does not mean every figure on the estimate is fixed; taxes, insurance, services, points and changed application facts need separate attention.
Request written terms for the lock period, extension fees, relock options and any float-down feature. Ask what happens if appraisal, credit, down payment, loan amount or product changes. Policies vary by lender, so save the answer attached to the offer.
Compare offers using one common scenario
Use the same property price, down payment, loan type, term, credit profile, occupancy and comparison date. Put rate, APR, points, lender credits, mortgage insurance, monthly payment and cash to close side by side. A lower rate purchased with points may cost more if the loan is sold or refinanced early.
Ask each lender for both a matching lock period and a realistic closing calendar. A short lock that expires before appraisal, title or construction work finishes can reverse an apparent saving through extension fees or repricing.
Manage the closing timeline actively
Record milestones for appraisal, underwriting, insurance, title, seller documents and the final disclosure. Check progress well before the lock expires. If a delay becomes likely, ask for written extension options and who bears the cost before the deadline passes.
Keep the final choice grounded in total cost and your likely holding period, not a forecast of tomorrow’s rates. Preserve the written offers, lock confirmation and later revisions so changes can be explained at closing.
Decision checklist
- Offers use the same loan and property assumptions.
- Lock status and exact expiration are confirmed.
- Points, credits, APR and cash to close are compared.
- Extension and changed-loan rules are in writing.
- Closing milestones fit within the lock period.
Frequently asked questions
01Does a rate lock fix every closing cost?
No. It addresses the rate under stated conditions; review each loan charge, prepaid item and later estimate revision separately.
02What if my closing date moves beyond the lock?
Ask the lender before expiration for written extension cost and alternatives. The contract and cause of delay may affect who bears it.
Primary sources and further reading
Always verify the date, scope and local application before using a source for a specific decision.
Independent educational information. Not legal, tax, lending, or investment advice. Verify local rules and consult licensed professionals before making a real estate decision.