If you signed a purchase contract sometime in late summer, the past six weeks have probably felt like watching the ground shift under a house you haven't closed on yet. Mortgage rates spent most of this year in the 6% range. Then they broke higher, and quickly.
The 30-year fixed average tracked by Freddie Mac stood at 6.95% on September 17. It crossed 7% the following week, reached 7.28% on October 1, and has held at 7.40% in both weekly readings since. That is the highest level since 2023, and it has landed squarely on people who are mid-transaction: under contract, appraisal ordered, closing date already on the calendar.
For those buyers, the most important line in the loan file right now may be the rate lock.
What your lock actually protects
A rate lock is a lender's commitment to hold a specific interest rate for a set period, provided you close within that window and nothing material changes on your application. According to the CFPB, locks are typically offered for 30, 45 or 60 days, and sometimes longer. If you locked before the run-up, that commitment is now worth real money.
Take a $350,000 loan. At 6.95%, principal and interest come to about $2,317 a month. At 7.40%, the same loan runs about $2,423. That is roughly $107 a month, or close to $1,280 a year, for as long as you keep the mortgage.
The protection has limits. A locked rate can still change if your loan amount, down payment, credit score or verified income changes before closing. An appraisal that comes in low can force a different loan amount. So can a new car loan opened in the middle of escrow. In a rising market, any of those can push you back onto today's pricing, which is about the worst moment to lose a lock.
Not sure whether you locked at all? Check the top of page 1 of your Loan Estimate. It shows whether the rate is locked and when the lock expires. Some lenders lock automatically when they issue the estimate. Plenty don't.
If your lock is about to expire
This is where most of the stress sits. Closings slip for ordinary reasons, like a slow appraisal, a title issue, or a seller who needs another week to move out. When the closing date drifts past the lock expiration, you generally have two choices. You can pay to extend the lock, or you can let it lapse and re-lock at whatever the market offers that day.
Extensions aren't free, and pricing varies by lender and by how many days you need. The CFPB points out that your Loan Estimate won't tell you what an extension costs, so you have to ask. Ask early. A lender quoting an extension price three days before expiration holds all the leverage.
The decision itself is more straightforward than it feels. Pull up current mortgage rates for the same loan type and compare them with your locked rate, making sure the posted figures assume a similar down payment and point structure to yours. If today's rate is meaningfully higher, as it is for most borrowers who locked in August or early September, an extension fee will often cost far less than re-locking several tenths of a point higher. Run the numbers on your own loan amount before you decide. If rates had fallen below your lock, letting it expire could come out ahead, but that isn't the market buyers are facing this month.
What about float-downs?
Some lenders offer a float-down option, which lets a locked borrower capture a lower rate if the market drops before closing. It usually carries an upfront cost or conditions, such as a minimum decline before it can be used. With rates climbing, a float-down does little for anyone already locked.
It matters more for buyers who haven't locked yet, and for them the call has gotten harder. Locking now means accepting rates near the 7.4% national average. Waiting means betting that the bond market reverses before your closing date, and nothing in the recent trend guarantees that. A longer lock costs more, but if closing is more than 45 days out and your budget is tight, paying for certainty can be the cheaper mistake.
A few calls worth making this week
If you're under contract, confirm your lock expiration date in writing and ask your loan officer what a 7, 15 or 30-day extension would cost. Hold off on new credit, job changes or large unexplained deposits until after closing. Keep your agent and the title company informed about the lock date, too, since they are often the ones who can keep a closing from slipping.
Rates may come back down. They have before, and nobody calls the turn with much reliability. But a buyer who is already under contract doesn't need a forecast. You need to know what you locked, when it runs out, and what it would cost to protect it. The rest can wait until you have the keys.
