You can typically lock a mortgage rate for 30, 45, or 60 days, with shorter 15-day locks available for streamlined refinances and extended locks running 90, 180, or even 360 days for situations like new construction.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage? The lock freezes your interest rate while the loan is processed, so market swings between application and closing don’t change what you’ll pay. The right length depends on how long your file actually needs, and getting it wrong costs real money.
The Standard Lock Periods
Thirty, 45, and 60 days are the durations most lenders offer by default, built around the typical underwriting and closing timeline for a conventional purchase or refinance.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage? A 30-day lock fits when the appraisal, title search, and document review are expected to move quickly. A 45- or 60-day lock gives breathing room when the timeline is less certain, which is common during busy buying seasons or when your file has moving parts.
Shorter locks of about 15 days show up occasionally, usually on streamlined refinances where most paperwork is already in order. They’re not a good fit for a purchase, where appraisal and title work alone can eat most of that window.
Extended Locks for New Construction
If the home hasn’t been built yet, you need a lock long enough to carry you through to the certificate of occupancy. Extended locks of 90, 180, or 360 days exist for exactly this reason. They’re less common than standard locks and almost always carry additional cost, so you’ll want the builder and the lender working from the same completion estimate before you commit to a length.
What a Longer Lock Costs
For 60 days or less, most lenders don’t charge a separate fee. The cost of the lock is already priced into the interest rate. When a short-term lock does carry a fee, it typically runs about 0.25 to 0.50 percent of the loan amount.
Longer locks cost more because the lender is taking on greater risk that market rates will move against them while they hold yours steady. That cost shows up as a slightly higher interest rate, additional upfront points, or a flat fee, and pricing varies by lender and loan product. Your Loan Estimate will show whether your rate is locked but won’t itemize what you’re paying for the duration itself.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage? Ask the loan officer for that breakdown before deciding between, say, a 45-day lock and a 60-day lock on the same loan.
How to Choose the Right Length
The right lock duration is the one that comfortably covers your actual closing timeline, with a buffer. Several factors push that timeline longer than borrowers expect.
- Loan type. Government-backed loans (FHA, VA, USDA) often involve extra steps like specific appraisal requirements or 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. If your lender is processing a high volume of applications, underwriting slows. A 45- or 60-day lock is safer during peak buying seasons.
- Complex finances. Self-employment income, multiple properties, or unusual asset structures all extend the time an underwriter needs to verify your file.
- New construction. The lock has to cover the full construction period through the certificate of occupancy, which is why 180- and 360-day locks exist.
A buffer of at least one or two weeks beyond your loan officer’s estimated closing date is generally wise. Paying slightly more for a longer lock up front is almost always cheaper than paying for an extension later.
What Happens If Your Lock Expires
If the lock expires before you close, you lose the guaranteed rate. You then have two options: pay for an extension, or accept whatever the market rate is on the day you close. If rates have climbed since your original lock, that difference carries for the life of the loan.
Extension Fees
An extension keeps your locked rate alive for an additional period, usually in increments of about 15 days. The cost generally runs 0.125 to 0.375 percent of the loan amount. On a $400,000 loan, that’s roughly $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 caused the delay, such as the appraiser, title company, or settlement agent, some lenders split the fee. If the delay was on your side (slow to return documents, for instance), you’ll likely pay the full amount.
Letting the Lock Lapse on Purpose
If current market rates are lower than your original locked rate, letting the lock expire and taking the new rate can work in your favor. You skip the extension fee and pay less interest over the life of the loan. It’s a gamble, though. If rates have risen, you pay more. Work through the numbers with your loan officer before making that call.
If Rates Drop After You Lock
A float-down option addresses the opposite problem: you locked, and now rates have fallen. Some lenders offer float-down as an add-on that lets you adjust your locked rate downward one time before closing if market rates drop by a specified amount.
Float-downs aren’t free. They involve an upfront fee or a small pricing adjustment built into your rate. Terms vary. Most lenders require rates to drop by a minimum threshold before you can exercise the option, and you can usually only use it once. Not all lenders offer float-downs, so ask about availability early in the process. Whether the option earns back its cost depends on how volatile rates are and how long your lock period runs.
Changes That Can Void the Lock
Picking the right length is only part of the protection. A rate lock holds only as long as the key details of your application stay the same. If something material changes between lock and closing, the lender can adjust 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. Opening a new credit card, missing a payment, or taking on new debt during the lock period can lower your score enough to change the rate the lender will offer.
- An income or employment change. Switching jobs, losing a source of income, or a significant shift in your debt-to-income ratio can all affect your locked terms.
- A change to the loan itself. Adjusting the down payment, switching between a fixed-rate and an adjustable-rate mortgage, or changing the loan amount after locking can trigger a rate revision.
- Appraisal issues. If the home appraises for less than expected and the loan has to be restructured, the new terms may carry a different rate.
The safest approach is to avoid new accounts, large purchases, and job changes from the day you lock until the day you close.
When in the Process to Lock
Most borrowers lock after signing a purchase agreement but before the appraisal comes back. At that point you have a firm property address, a clear loan amount, and a reasonable closing date, which are the pieces the lender needs to issue the lock.
If your budget is tight and a rate increase would push the payment past what you can comfortably afford, locking earlier buys peace of mind. If rates look stable or are trending down, some borrowers wait longer, though predicting rate movements is inherently uncertain. For new-construction purchases, the lock often has to go in place months before the home is finished, which is where the extended-lock pricing becomes part of the overall cost of the loan.