When to Lock In a Mortgage Rate and How Long a Lock Lasts

Many lenders let you lock your rate once you have a property and a completed application, and a typical lock runs 30, 45 or 60 days. As for when to lock in a mortgage rate, lock when the quoted payment fits your budget and your expected closing date falls inside the lock period with a few days to spare. Longer locks and extensions can cost more, so match the lock length to your timeline.

When to Lock In a Mortgage Rate: The Quick Answer

Here is the short version for a buyer or refinancer with an application in progress:

• Earliest point: After you have a property and an application. Federal disclosure rules define a mortgage application as six items, including the property address. Many lenders will not lock before then.
• Typical length: Locks are “typically available for 30, 45, or 60 days, and sometimes longer,” according to the Consumer Financial Protection Bureau (CFPB).
• Cost: A longer lock or an extension can cost more through a higher rate, a fee or both. Pricing varies by lender.
• Right moment: Lock when the payment works for you and the lock covers your closing date.

Ask each lender you are considering for its lock periods and their cost before you commit.

What a Mortgage Rate Lock Covers

A mortgage rate lock is your lender’s agreement to hold a rate for a set period. The CFPB says a locked rate won’t change before closing “as long as you close within the specified time frame and there are no changes to your application.”

A lock usually pins down these terms:

• The interest rate on your note.
• The price of that rate, meaning any discount points you pay or lender credit you receive. Points show up with your other lender charges, so it helps to know how a loan origination fee works.
• The expiration date and time, after which the lender no longer has to honor the terms.

How the Loan Estimate shows your lock

Regulation Z requires page 1 of your Loan Estimate to say whether the rate is locked, under the label “Rate Lock.” When the rate is locked, the lender must also show the date, time and time zone when the lock ends (12 CFR 1026.37(a)(13)).

Many borrowers get a Loan Estimate first and lock later. In that case, the lender must send a revised Loan Estimate with the locked rate, points and lender credits no later than three business days after you lock (12 CFR 1026.19(e)(3)(iv)(D)). If you lock after you receive the Closing Disclosure, the lender sends a corrected Closing Disclosure instead. Check that the revised figures match what you agreed to.

The Loan Estimate does not show what you paid for your lock period or what an extension would cost, the CFPB notes. Ask for those numbers in writing.

When Can You Lock In a Mortgage Rate?

Lock rules vary by lender, but the table shows where a lock typically fits.

For a purchase, the earliest practical lock usually comes right after your offer is accepted and you apply. For a refinance, you can often lock as soon as you apply.

The timeline after that depends on mortgage underwriting, the appraisal and the title work.

How Long Can You Lock a Mortgage Rate?

Locks typically run 30, 45 or 60 days, and some lenders offer longer ones. Many lenders charge more for a longer lock, either through a higher rate or a fee, though pricing varies by lender. The CFPB suggests asking whether a shorter or longer lock is available and at what cost.

When a closing slips past the lock date, many lenders offer a rate lock extension. Some charge a fee for it, and the CFPB warns that a lock “may be expensive to extend.” Since the Loan Estimate does not list extension costs, ask about them before you lock.

One lender’s published lock terms

Navy Federal Credit Union’s mortgage FAQ, read in November 2026, describes these terms for its own loans:

• A 60-day lock with its “No-Cost Freedom Lock” float-down option at no charge.
• A 90-day extended lock that “may also be available for a fee of 0.125% of your total loan amount.”

Say a borrower takes a $350,000 loan with that 90-day option. The fee would be $437.50 ($350,000 × 0.125%). Other lenders price locks differently, and these terms can change, so treat them as one lender’s example.

Extended locks for new construction

A new home can take months to finish. Some lenders offer extended locks for new construction, often with an upfront fee or a higher rate. Compare that cost against the risk of floating until the builder sets a firm closing date.

Picking the right lock length

The CFPB advises making sure your lock is “long enough to cover the time until you close on your loan.” Count the days to the closing date on your contract, then add a buffer for appraisal or title delays.

Should I Lock My Mortgage Rate Today? Use This Checklist

For context, Freddie Mac’s Primary Mortgage Market Survey put the average 30-year fixed rate at 7.18% on November 5, 2026, compared with 6.22% a year earlier. Your own quote depends on your credit, down payment, loan type and points, so check current mortgage interest rates and get a live quote.

Nobody can tell you where rates go next. Instead, these questions can tell you whether locking today makes sense:

1. Does your closing date fit inside an available lock? If your contract closes in 35 days, a 45-day lock leaves room for delays.
2. Does the payment at today’s quote fit your budget? If it does, locking protects a number you already accept.
3. Could you handle a higher payment? If a modest rate rise would stretch your budget or your debt-to-income ratio (DTI), floating carries real risk.
4. Is your file stable? A lock protects you only if your income, credit and loan amount hold steady through closing.
5. Have you compared offers on the same terms? Compare rate, points and lock length together, and know the difference between interest rate and APR before you choose.

How much a rate change moves the payment

Here is a hypothetical. A borrower takes a $350,000, 30-year fixed loan at an example rate of 7.00%. The monthly principal and interest would be about $2,329. At 7.25%, it would be about $2,388, or roughly $59 more each month. These figures exclude property taxes, homeowners insurance and mortgage insurance.

When an extra $59 a month would break your budget, locking makes more sense than floating. Conversely, if you could absorb it and have time before closing, waiting is a choice you can make knowingly.

Float-Down and Relock Options

A float-down option lets you lower a locked rate if market rates drop before closing. Lenders that offer one often charge a fee and set conditions. For example, rates may need to fall by a minimum amount, or you may need to use the option within a window before closing. Navy Federal, for one, caps its no-cost float-down at a total reduction of 0.25% within the original 60-day lock, and it suggests starting the float-down 7 calendar days before closing.

Before you pay for a float-down, ask what it costs, how far rates must drop, and when you can use it.

If your lock expires before closing, you will need to extend it or relock. Lenders handle relocks differently. Ask whether an expired lock reprices at the current market rate or at the worse of the old and new rates, because that answer decides whether a short extension is the cheaper path.

What Can Break or Delay a Rate Lock

A lock holds only while your application stays the same. The CFPB lists these common reasons a locked rate can still change:

• You change the loan type or the size of your down payment.
• The appraisal comes in higher or lower than expected.
• Your credit score changes, for example after a new loan or a missed payment.
• Your lender cannot document overtime, bonus or other income.

Delays are the other threat. A low appraisal can lead to renegotiation or a bigger down payment, and either can outlast a lock. Title problems and slow document returns can also push closing past the expiration date.

How to protect your lock

• Send documents fast. Answer every underwriting request the day you get it.
• Keep your credit unchanged. Avoid new credit cards, car loans and large purchases until after closing.
• Hold your job steady. Tell your lender right away about any change in income or employment.
• Watch the expiration date. If closing looks tight, ask about an extension a week or more before the lock ends.

FAQ: When to Lock In a Mortgage Rate

How early can you lock in a mortgage rate?

Many lenders let you lock once you have a property address and a submitted application. For a purchase, that usually means after your offer is accepted. Some lenders offer lock-and-shop programs that let a preapproved buyer lock earlier, typically for a fee.

How long can you lock a mortgage rate?

The CFPB says locks are typically available for 30, 45 or 60 days, and sometimes longer. Longer locks and extensions can cost more, so match the lock length to your timeline.

Should I lock my mortgage rate today?

Lock today if the payment fits your budget, your closing date fits inside an available lock, and a rate increase would strain your finances. If you can absorb a higher payment and closing is weeks away, floating is an option, but it carries risk in both directions.

What happens if my rate lock expires?

You will usually need to extend the lock or relock at the lender’s current pricing. Policies vary, so ask your lender how it prices an expired lock before you sign.

Does locking a mortgage rate cost anything?

Sometimes. Lock pricing varies by lender, and the CFPB notes that the Loan Estimate does not show how much you are paying for a specific lock period or what a longer one would cost, so ask. The CFPB also lists rate-lock fees among common origination charges. Compare the total lender charges across Loan Estimates.

Your Next Step

The answer to when to lock in a mortgage rate comes down to two numbers: the payment you can live with and the days until closing. Once both line up, a lock fixes your rate.

Before you lock, ask your loan officer for the lock period, its cost, the extension fee and any float-down terms in writing. Then compare those terms across lenders on the same day.