You can lock a mortgage rate for anywhere from about 15 days to 360 days, but the standard options most lenders offer are 30, 45, and 60 days.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage? The right length is the shortest one that comfortably covers your expected closing date, because longer locks cost more and expired locks can cost even more.
Common Lock Lengths and When Each Fits
A 30-day lock fits a straightforward purchase or refinance where the appraisal, title search, and underwriting are expected to move quickly. It’s the cheapest standard option and works well when your file is clean and your lender isn’t backed up.
A 45- or 60-day lock is the safer choice when there’s any uncertainty in the timeline. Busy buying seasons, government-backed loans, and self-employed borrowers all tend to push closings past 30 days. The extra weeks give you a buffer without a large jump in cost.
Short 15-day locks are less common and usually reserved for streamlined refinances where most paperwork is already in the lender’s hands. On the other end, extended locks of 90, 180, and 360 days exist mainly for new-construction purchases, where the home isn’t finished yet and closing may be months away. Extended locks almost always come with meaningful additional cost.
What a Longer Lock Costs
For standard lock periods of 60 days or less, most lenders don’t charge a separate fee. The cost is built into the interest rate itself. When there is a short-term lock fee, it usually runs about 0.25 to 0.50 percent of the loan amount.
Longer locks cost more because the lender carries the risk that market rates will rise while yours stays frozen. That cost typically shows up as a slightly higher interest rate, additional upfront points, or a flat fee. Your Loan Estimate will show whether the rate is locked, but it won’t break out how much you’re paying specifically for the lock length. Ask your loan officer for that number directly, and compare the extra cost against the price of an extension later if the shorter lock runs out.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage?
Picking the Right Length for Your Loan
The right lock is the one that covers your actual closing timeline with a little room to spare. A few things push that timeline out:
- Loan type. FHA, VA, and USDA loans involve extra steps like government appraisal requirements and additional compliance reviews, which can add days or weeks compared to a conventional loan.
- Appraisal and title work. Both depend on outside professionals, and delays are common during busy seasons or in areas with limited availability.
- Lender volume. When a lender is processing heavy application volume, underwriting slows down. A 45- or 60-day lock is safer during peak buying seasons.
- New construction. If the house isn’t built yet, the lock has to cover the entire construction period through the certificate of occupancy. Extended locks of 180 to 360 days are common here, and the builder and lender should agree on a realistic completion date before you choose a length.
- Complex finances. Self-employment income, multiple properties, or unusual asset structures all take underwriters longer to verify.
Ask your loan officer for a realistic closing estimate, then add a buffer of at least a week or two before picking your lock period.
Extending or Losing the Lock
If your lock expires before you close, you lose the guaranteed rate. Your two choices are to pay for an extension or accept whatever the market rate is on your closing day. If rates have climbed since you locked, an expired lock can mean a noticeably higher payment for the life of the loan.
Extension fees generally range from 0.125 to 0.375 percent of the loan amount, often calculated in roughly 15-day increments. On a $400,000 loan, that’s about $500 to $1,500 per extension. Some lenders charge a flat fee instead.
Who pays depends on who caused the delay. If the lender’s own processing pushed you past the deadline, the lender should cover it. If a third party like the appraiser, title company, or settlement agent caused the delay, some lenders split the fee with you. If you were slow returning documents, expect to pay the full amount yourself.
Letting the lock expire on purpose is occasionally worth considering. If market rates have dropped below your locked rate, taking the new rate could save you money over the life of the loan without paying an extension fee. It’s a gamble, though. Walk through the math with your loan officer before deciding.
Protecting the Lock You Have
Choosing a long enough lock only helps if the lock actually holds. A rate lock stays valid only as long as the key details of your application don’t change. If something material shifts, the lender can revise your rate or void the lock entirely.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage? Common triggers:
- A credit score drop from opening a new account, missing a payment, or taking on new debt.
- An income or employment change, including a job switch or a shift in your debt-to-income ratio.
- A change to the loan amount, down payment, or loan program after locking.
- An appraisal that comes in low and forces you to restructure the loan.
The safest habit during the lock period is to avoid new accounts, large purchases, and job changes until the day you close.
The Float-Down Option
Length isn’t the only lever. A float-down is an add-on some lenders offer that lets you adjust your locked rate downward one time before closing if market rates fall by a set amount. It typically costs an upfront fee or a small pricing adjustment built into your rate, and most lenders require rates to drop by a minimum threshold before you can use it. Not every lender offers one, so ask early if it matters to you. Whether it’s worth the price depends on how volatile rates are and how long your lock runs.