How Long Does a Rate Lock Last on a Mortgage?

A mortgage rate lock typically lasts 30 to 60 days, though lenders offer windows as short as 7 days and as long as a year depending on the loan and the transaction. The lock is your lender’s promise to hold a specific interest rate and point structure while your application is processed, shielding you from market swings before closing. The right length depends on how quickly you expect to close and whether you’re buying an existing home, refinancing, or building new.

Standard Rate Lock Timeframes

Lenders offer locks in set intervals that line up with common closing timelines. The widely available options are 30, 45, 60, and 90 days, with 30- and 45-day locks the most common choices for a standard home purchase.¹ Some lenders offer shorter windows of 7 to 15 days, often used for quick refinances where most paperwork is already in place. Others extend locks up to 120 days for transactions with more moving parts.²

Government-backed loans through the FHA or VA often take longer to close than conventional mortgages, so a 60- or 90-day lock is often more practical for those programs. As a general rule, your lock should extend at least a week or two past your expected closing date to give yourself a cushion for delays in appraisals, title work, or underwriting.

Longer Locks for New Construction

If you’re building a home, standard 30- to 60-day locks usually won’t cover the timeline. Many lenders offer extended lock periods of 120, 180, 270, or even 360 days to bridge the gap between breaking ground and move-in. These longer commitments carry higher costs than a standard lock. The fee structure varies by lender: some charge a flat lock-in fee, while others adjust the interest rate upward. Because construction schedules are unpredictable, confirm that your lock covers the full anticipated build time plus a reasonable buffer for weather delays, permitting issues, or material shortages.

Picking a Lock Period That Matches Your Closing

A shorter lock often comes with a slightly better rate or lower fee, but leaves less room for delays. A longer lock gives you breathing room but may cost more. Some practical guidelines by transaction type:

Standard home purchase: A 45- or 60-day lock covers most conventional closings with a reasonable buffer. The national average closing timeline for a financed home purchase has hovered around 42 to 45 days in recent years.
FHA or VA loan: These government-backed loans involve additional review steps and often take longer. A 60- or 90-day lock is generally the safer choice.
Refinance: With clear title and no appraisal complications, a 30- or 45-day lock may be sufficient, since refinances skip many steps involved in a purchase.
New construction: Match the lock to your builder’s estimated completion date plus at least 30 days of cushion. Extended locks of 6 to 12 months are available for this purpose.

Before you commit, ask your lender how long they expect the process to take and what extension options exist if closing is delayed.

What a Lock Costs

Many lenders don’t charge a separate upfront fee for a standard 30- to 60-day rate lock. The cost is built into the interest rate itself: longer lock periods or locks during volatile markets tend to come with a slightly higher rate. When lenders do charge an explicit lock fee, it typically runs between 0.25% and 0.50% of the loan amount.² On a $350,000 mortgage, that translates to roughly $875 to $1,750. The longer the lock period, the higher the fee tends to be, because the lender assumes more risk that market rates will move against them.

Once you lock, federal law requires your lender to send you a revised Loan Estimate within three business days. This updated form reflects the locked interest rate, any adjusted points or lender credits, and all other charges that depend on the rate.³ Compare it against your original estimate and raise any unexpected changes with your lender immediately.

What Happens If the Lock Expires Before You Close

If your closing is delayed past the expiration date, you don’t automatically keep the locked rate. Most lenders will offer the loan at whatever rate the market is charging at that point, which could be higher or lower than your original lock.² You generally have three options:

Pay for an extension. You can ask the lender to extend your lock for an additional period. Extension fees vary but commonly run from 0.25% to 0.50% of the loan amount for a short extension, and can climb higher for longer periods. Not every lender offers extensions, and some cap how long a lock can be extended.
Relock at the current rate. Some lenders allow you to relock, but many apply “worst-case” pricing, meaning you get whichever rate is higher: the original locked rate or the current market rate. This protects the lender but means you won’t benefit if rates have dropped.
Accept the prevailing market rate. If you do nothing, you close at whatever rate is available at that time. If rates have fallen since your original lock, this could actually work in your favor.

The best way to avoid this situation is to choose a lock period with a buffer beyond your expected closing date and to stay in regular contact with your lender about the processing timeline. If you sense a delay coming, ask about extension options before the lock expires rather than after.

What Can Void a Lock Before Expiration

Even with a signed agreement, certain changes to your loan application can give the lender grounds to cancel the locked rate. The lock is based on a specific risk profile, and if that profile shifts materially, the original pricing no longer applies. Common triggers include:⁴

An appraisal that comes in too low or too high, changing your loan-to-value ratio. A significantly low appraisal may force the lender to restructure the loan entirely.
Credit score changes. Taking on new debt, missing a payment, or applying for another line of credit during the lock period can push you into a different pricing tier.
Income or employment changes. A drop in verified income, a job change, or bonus income that can’t be documented may force the lender to reassess your ability to repay.
Switching loan programs. Moving from a conventional mortgage to an FHA loan, or from a fixed rate to an adjustable rate, creates a different product with different pricing. The original lock doesn’t carry over.
Changing the loan amount or down payment. Adjusting the borrowed amount beyond what was originally locked alters the risk calculation.

Your lock agreement lists the specific conditions that allow the lender to renegotiate or cancel. Read that language before you sign, and during the lock period avoid major financial moves like opening new credit accounts, making large purchases on credit, or changing jobs.

Questions to Ask Before You Lock

A few questions up front save trouble later. Ask whether the lender charges a lock fee and whether it’s refundable. Ask about extension options and their cost. Ask what specific conditions could void the lock.⁵

Also ask about a float-down option, which lets you lock in a rate now but drop to a lower rate if the market falls before closing. Not every lender offers this feature, and those that do typically charge an additional fee, often between 0.25% and 1% of the loan amount, paid upfront or rolled into closing costs. Most float-downs require rates to drop by a minimum amount, often at least 0.25 percentage points, before you can exercise the option, and you usually have to request the float-down yourself rather than having it applied automatically. Whether it makes financial sense depends on comparing the upfront fee against the monthly savings from a lower rate over the life of the loan.

1
Freddie Mac. Why You Should Consider a Rate Lock-In
2
Federal Reserve. A Consumer’s Guide to Mortgage Lock-Ins
3
eCFR. 12 CFR 1026.19 – Certain Mortgage and Variable-Rate Transactions
4
Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage?
5
Consumer Financial Protection Bureau. Review Loan Estimates