Should You Lock Your Mortgage Rate Now, or Wait?
It depends on your timeline and how much risk you want to take. Locking protects you if rates rise before closing but won't lower your rate if they fall, unless you have a float-down option. Waiting, or floating, leaves you open to either. Most standard locks need a signed purchase contract, and a lock is a shorter clock than a pre-approval.
Last updated September 29, 2026What does locking actually do?
A rate lock is the lender's promise to hold a rate for a set number of days while your loan goes through underwriting. It protects you from increases, and it keeps you at the locked rate if rates drop, unless your lender offers a float-down. Floating means you haven't committed yet, with the opposite trade-off. Choosing between them is a call on where rates will go before you close, so there's no single right answer.
Can I lock before I'm under contract?
Usually not for a standard lock, because it's tied to a specific property, loan amount and closing date. Until then, any rate you're quoted is an estimate. Some lenders offer "lock and shop" programs that hold a rate for roughly 60 to 120 days or more while you house hunt, often for a fee.
How long do locks and pre-approvals last?
They're two different clocks:
| Item | Typical length |
|---|---|
| Pre-approval letter | Often 30 to 90 days, depending on the lender |
| Standard rate lock | 30 days is the most common |
| Shorter lock | 15 days, sometimes 7, usually cheaper |
| Longer lock | 45 to 60 days or more, usually costs more |
| Lock and shop | Roughly 60 to 120 days or more, before a contract |
A pre-approval estimates what you can borrow from your income, assets and credit at the time. A lock is a narrower commitment on the rate for a specific loan, which is why it runs out sooner. Close to closing, lenders commonly refresh your credit to check for new debt.
It depends on your situation:
- A rate you like is available now: locking captures it, and you can look at refinancing later if rates fall a lot.
- Closing is weeks away: you can float, then lock closer to closing with a shorter, cheaper lock, accepting the risk that rates rise meanwhile.
- You're still house hunting: a standard lock isn't available yet; ask about lock and shop.
- Rates are rising and closing is near: locking sooner protects you, and remember that extending a lock usually costs money.
| What a lock does | Holds your rate for a set period |
|---|---|
| If rates fall after you lock | You keep the locked rate unless you have a float-down |
| Lock before a contract? | Usually no, except lock-and-shop programs |
| Most common lock length | 30 days |
Related questions
- what determines your mortgage rate quote
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Sources
- https://www.consumerfinance.gov/ask-cfpb/whats-a-lock-in-or-a-rate-lock-en-143
- https://www.mortgageresearch.com/articles/locking-in-a-mortgage-rate-before-finding-a-house-lock-and-shop
- https://www.debt.com/news/when-lock-in-mortgage-rate
- https://mymortgageinsider.com/when-should-i-lock-in-my-mortgage
- https://www.nerdwallet.com/mortgages/learn/what-is-mortgage-rate-lock
- https://www.experian.com/blogs/ask-experian/how-long-does-a-mortgage-preapproval-last
- https://www.zillow.com/learn/how-long-is-mortgage-preapproval-good-for
- https://guide.freddiemac.com/app/servicing/section/5604.3
- https://www.lower.com/mortgages/how-long-can-you-lock-a-mortgage-rate
- https://www.newcastle.loans/mortgage-guide/interest-rate-lock
- https://loanpronto.com/blog/second-credit-check-before-closing
- https://www.sirva.com/learning-center/blog/2025/02/12/how-often-will-a-full-credit-report-be-pulled-during-the-mortgage-approval-process-
- https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-desktop-originator/undisclosed-liabilities
Sourced from licensed loan officers and brokers in the FreeRateUpdate network.
Educational information only, not individualized financial or legal advice. Program details and rates change; verify current terms with a licensed loan officer before making a decision.