A mortgage rate lock definition comes down to one sentence: it is a lender’s written commitment to hold your interest rate and points for a set number of days, even if market rates move while your loan is processed. The commitment covers the price of the loan, not the loan’s approval.
By Duane Buziak, NMLS #1110647. I have been a mortgage broker since 2014, and the lock questions below come up on nearly every file. This article covers what a lock fixes, how long it runs, what it can cost, a worked dollar example, and how an independent broker can compare lock terms across wholesale lenders before committing to one.
What a Rate Lock Fixes, and What It Leaves Open
Four terms carry most of the meaning here:
- Points: upfront fees, each equal to 1% of the loan amount, paid to lower the rate (discount points) or credited to you in exchange for a higher rate.
- Float: leaving your rate unlocked so it can rise or fall with the market until you decide to lock.
- Lock period: the number of days the lender agrees to honor the rate and points.
- Lock confirmation: the written record of the lock, showing the rate, points, dates, and loan program.
Once locked, the rate and points on the confirmation are protected through the lock period, provided your loan closes on the terms the lock was based on. Change the loan amount, program, property type, or occupancy, and the lender can reprice.
What the lock does not fix
A lock is not a pre-approval and is not a guarantee of approval. It does not freeze your credit profile, so a new debt or a missed payment can still change your pricing or sink the file. It does not set the appraised value, and a low appraisal can change your loan-to-value ratio and, with it, your price. It also does not fix third-party closing costs such as title, escrow, and recording charges.
Rates move; benchmarks are not quotes
Mortgage pricing can change daily, and sometimes more than once a day. Freddie Mac publishes a weekly 30-year fixed-rate average in its Primary Mortgage Market Survey. It is a useful gauge of direction, but it is a national average from a weekly survey, not an offer. Check the current figure on Freddie Mac’s site and read it as of its publication date; your own rate depends on credit, down payment, property, and program.
One more misconception: locking is not automatic at application. In most cases you have to ask for the lock, and your loan officer then confirms it in writing. The Consumer Financial Protection Bureau explains the same distinction.
Choosing a Lock Period: Timeline, Closing Date, and the Float Decision
Lock periods commonly come in 15, 30, 45, and 60-day options, and longer terms are often priced higher. Exact options and pricing vary by lender and by loan program, so confirm the current menu before you decide.
Match the days to the closing date
Count backward from your contract closing date and add a cushion. The lock has to outlast every step between now and the closing table:
- Resale purchase: appraisal scheduling, underwriting conditions, and title work usually fit a shorter lock, if the contract date is realistic.
- New construction: completion dates slip. Ask about longer lock terms, and about what happens to pricing if the builder is late.
- Refinance: there is no contract date forcing the timeline, but appraisal and payoff steps still take time.
Federal rules also shape the calendar. Under the CFPB’s integrated disclosure rule, you must receive the Closing Disclosure at least three business days before closing. The CFPB’s Owning a Home resources walk through that disclosure. A change that triggers a new waiting period can push closing back, so build those days into your lock.
A decision frame for float versus lock
- Count the days to closing, including a buffer for the appraisal and underwriting.
- Calculate the highest monthly payment you could carry. If a higher rate would break your budget or your debt-to-income ratio, floating is risky.
- Decide how much uncertainty you can tolerate. Floating is a bet on direction, and nobody can predict rates reliably.
- If a higher payment would hurt and you have a signed contract, lock.
The mistake I see most often is locking for too few days to save a small amount of pricing, then paying an extension fee when the appraisal or a missing document pushes closing past the expiration date.
Lock Costs, Extensions, Relocks, and Float-Downs
Lenders build lock costs in different ways. Some price the lock period into the rate or points, so a 60-day lock simply quotes a slightly higher cost than a 30-day lock. Some charge a separate lock fee on longer terms. Nearly all charge for extensions. Structures differ by lender, so ask which applies to your quote.
What happens at expiration
If your lock expires before closing, the lender may let you extend it for a fee, often quoted as a percentage of the loan amount per number of days. Or it may require you to relock at current market pricing, which could be better or worse than your original rate. The usual causes are slow appraisals, missing documents, and title or seller delays, all of which you can reduce by responding to conditions quickly.
Float-down options
A float-down, where a lender offers one, lets you capture a lower rate if the market improves, under conditions the lender sets. Those conditions can include a minimum rate improvement, a one-time use, a fee, or a window in the lock period. Not every lender or program offers it, so treat it as something to ask about, not something to assume.
How to read your lock confirmation
Check each of these against what you were quoted:
- Interest rate and points or credits
- Lock date and expiration date (count the days yourself)
- Loan program, loan amount, and occupancy
- Any conditions that allow repricing
- Extension, relock, and float-down terms, if stated
If anything differs from your quote, ask before you sign, not at the closing table.
Worked Dollar Example: $400,000 Locked Before a Rate Move
For example, imagine you lock a $400,000, 30-year fixed loan at 6.50% and the market later moves to 6.75% before your closing date. These figures are hypothetical, are not offers, and do not reflect any specific lender’s pricing. Payments are principal and interest only, calculated with the standard amortization formula.
| Item | Locked at 6.50% | Unlocked at 6.75% | Difference |
|---|---|---|---|
| Loan amount | $400,000 | $400,000 | None |
| Term | 30 years (360 payments) | 30 years (360 payments) | None |
| Monthly principal and interest | $2,528.27 | $2,594.39 | $66.12 per month |
| Total of 360 payments | $910,177.20 | $933,980.40 | $23,803.20 |
| Hypothetical 15-day extension fee (0.125% of loan) | $500 | Not applicable | $500 one time |
In this illustration, the lock protects about $66 a month, or roughly $23,800 over the full 30 years if you kept the loan that long. That is real money, but the second line matters too. A $500 extension fee would equal about 7.6 months of the monthly savings ($500 divided by $66.12). The lock still comes out ahead, but a pattern of delays can erode the advantage.
The rates in the table were chosen for arithmetic, not forecasting. Rates could just as easily have fallen, in which case a float-down or a relock would have been the question. The point is to size the risk in dollars before you choose a lock length.
Lock Policies Across Wholesale Lenders: A Starting Map
Lock policies are set by each lender and often differ by loan program: conventional, FHA, VA, or Non-QM. A policy that applies to a conventional loan may not apply to a Non-QM loan from the same company. The table below shows the dimensions I compare for a borrower. Lender rate sheets and lock policies change, so where I have not verified a current detail from the lender’s broker-facing materials, the cell says so instead of guessing.
| Wholesale lender | Lock period options | Extension policy | Relock policy | Float-down availability |
|---|---|---|---|---|
| UWM | Confirm with Duane | Confirm with Duane | Confirm with Duane | Confirm with Duane |
| PennyMac | Confirm with Duane | Confirm with Duane | Confirm with Duane | Confirm with Duane |
| Newrez | Confirm with Duane | Confirm with Duane | Confirm with Duane | Confirm with Duane |
Duane Buziak is an independent broker with wholesale broker relationships with these lenders. He is not affiliated with, endorsed by, or a division of any of them. These are options he can compare for you, not recommendations.
The reason I will not fill every cell from memory is that stale lock terms cost borrowers money. Before you commit to a lender, ask for the current terms for your specific program in writing: how many lock days are available, the extension cost per day, whether a relock is priced at the market or at the original rate, and whether a float-down exists. Treat this table as a map of questions, not a promise of terms.
Why Broker Access Changes the Lock Decision
Duane Buziak works as an independent broker, which means a lock request is not limited to one lender’s menu. When you call a lender directly, you get that lender’s pricing and its lock terms. A broker with several wholesale relationships can compare rate, points, lock length, and extension terms across lenders before locking, then lock with the one whose program fits the loan. Sometimes the lowest rate carries a shorter lock or a stricter extension policy, and that trade-off is worth seeing before you commit.
A practical sequence
- Get pre-qualified. Duane’s pre-qualification does not affect your credit.
- Choose the lender and program. Compare lock terms, not only the rate.
- Request the lock once you have a signed contract or a firm refinance plan, and get the lock confirmation in writing.
- Track the expiration date through closing, and respond to every document request the same day.
For independent guidance on comparing offers, see the CFPB’s shopping for a mortgage tools and HUD’s home buying resources. If your loan is a conventional conforming loan, Fannie Mae sets many of its underwriting standards, and the Federal Housing Finance Agency publishes the annual conforming loan limits.
For realtors
Agents can use lock timelines when setting contract closing dates. A 30-day closing on a purchase with a tight appraisal schedule leaves almost no room, and a 45-day close with a matching lock leaves a cushion. Talk with your lender before writing the closing date into the contract.
Rate Lock FAQ: Ten Questions Answered Directly
What is a mortgage rate lock?
A mortgage rate lock is a lender’s written commitment to hold your interest rate and points for a set number of days. It protects you from market increases during that window. It does not guarantee loan approval, and the loan must close on the terms the lock was based on.
How long does a rate lock last?
Lock periods commonly run 15, 30, 45, or 60 days, though options vary by lender and loan program. Longer locks are often priced higher. Choose a period that covers your closing date plus a cushion for appraisal and underwriting delays, and confirm the exact options with your loan officer.
Does a rate lock cost money?
It can, depending on the lender. Some build the cost into the rate or points, some charge a fee on longer lock periods, and most charge for extensions. Ask which structure applies to your quote, and confirm any lock fee appears on your Loan Estimate.
Can I lock before I find a house?
Generally no, because a lock is tied to a specific property and loan. Without an address, there is nothing to lock against. You can get pre-qualified before you find a house to understand your budget, then request the lock after you have a signed contract.
What happens if my rate lock expires?
If your lock expires before closing, the lender may let you extend for a fee or may require a relock at current market pricing. Which applies depends on the lender’s policy and the reason for the delay. Ask about both before locking, since expiration is the most common costly surprise.
Can a lender change my locked rate?
A lender should honor the locked rate and points if the loan closes on the same terms. Repricing can occur if the loan amount, program, property, occupancy, or credit profile changes materially. Read the conditions on your lock confirmation, and report any changes to your loan officer right away.
What is a float-down?
A float-down is an option, offered by some lenders, that lets you capture a lower rate if the market improves after you lock. The lender sets the conditions, which can include a fee, a minimum improvement, or a time window. Availability varies, so ask before you lock, not after rates move.
Does a rate lock guarantee approval?
No. A lock protects your rate and points, not your approval. Underwriting still verifies your income, assets, credit, and the property’s appraisal. A lock is also different from a pre-approval, which evaluates your finances but does not set a rate for the loan.
Can a broker lock with UWM or PennyMac?
Yes, an independent broker with wholesale relationships can submit and lock loans with lenders such as UWM and PennyMac, subject to each lender’s program guidelines and approval. Duane Buziak is an independent broker with access to their wholesale pricing, and is not affiliated with either lender.
When should I lock my mortgage rate?
Most borrowers lock once they have a signed purchase contract or a firm refinance plan, because the lock period can then be matched to the closing date. If a higher payment would strain your budget, locking sooner reduces risk. No one can reliably predict rate direction.
Lock Terms in Writing: The One Thing to Check Before You Close
A lock protects your rate and points only for the days and conditions written on the confirmation. Read the expiration date, count the days to your closing, and know what an extension costs before you need one.
If you want those terms compared across wholesale lenders before you commit, call Duane Buziak at Wholesale Mortgage Rates by Duane Buziak, 804-212-8663. Your dream home is within reach: discover how wholesale mortgage rates can put more money back in your pocket while you secure the financing you need. Get your personalized rate estimate today with no credit impact and see exactly what you qualify for with the Mortgage Maestro’s expert guidance.
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