If your mortgage rate increased after pre-approval, the most likely explanation is simple: your rate was never locked in the first place. A pre-approval letter confirms that you qualify for a loan amount at an estimated rate, not that a lender has contractually guaranteed that price. Understanding this distinction changes how you approach the weeks between pre-approval and closing, and it can save you real money if you know what levers are still available to you.
What a Rate Increase After Pre-Approval Actually Costs You
Consider a $420,000 loan. At 6.5%, a 30-year fixed payment (principal and interest) runs approximately $2,655 a month. At 6.875%, that same loan runs approximately $2,759 a month, a difference of about $104 a month. Over five years, that gap adds up to roughly $6,240 in extra payments, and because more of each early payment goes to interest at the higher rate, the cumulative interest cost difference over that same five-year window is close to $6,000 once you account for the slower principal paydown. This example is illustrative only, not a quoted rate for any specific borrower, and actual figures depend on credit profile, loan program, and market pricing at the time of lock.
That 0.375% swing is not unusual. Pre-approval letters typically cite an estimated rate based on general market conditions and your credit profile at the time of application, not a locked, contractual price. The Consumer Financial Protection Bureau’s guidance on shopping for a mortgage is explicit that rates and terms can change until you lock them with a specific lender, and that comparing offers from multiple lenders is the only way to know whether a quoted rate is competitive.
Duane Buziak, NMLS #1110647, notes that this gap between the pre-approval estimate and the locked rate is the single most common surprise buyers report once they reach underwriting. Buyers often assume the number on their pre-approval letter is fixed, then feel blindsided when a lender reprices the loan weeks later. In most cases, nothing went wrong. The market moved, or the file simply hadn’t been locked yet. Knowing this upfront removes a lot of the panic when the number on your paperwork shifts before closing day.
Why Mortgage Rates Move Between Pre-Approval and Closing
Mortgage rates track the bond market daily, not your personal file. Lenders reprice loans based on movement in mortgage-backed securities, and the Freddie Mac Primary Mortgage Market Survey (PMMS) publishes a weekly national average that illustrates how much these figures shift even over short periods. As of September 2026, checking the current PMMS release against the rate quoted at your pre-approval is a useful first step if you’re wondering whether the increase reflects broad market movement or something specific to your file. A gap of two, four, or six weeks between pre-approval and an accepted offer is often enough for average rates to move a quarter point or more in either direction.
The most common misconception buyers carry into underwriting is that their pre-approved rate is guaranteed. It isn’t, and it was never meant to be. A rate becomes contractually fixed only once you formally lock it with a lender, a step that typically doesn’t happen until you have an accepted purchase contract and a closing date to work against. Pre-approval exists to establish eligibility and buying power for house hunting, not to freeze a price.
It’s also worth separating market-driven repricing from file-driven repricing. If your credit score dropped, your debt-to-income ratio rose because of a new car payment or increased credit card balances, or your loan amount changed because you’re now shopping in a different price range, any of these can reprice your loan independent of what the broader market is doing. A rate increase tied to your file usually signals a pricing adjustment, not a denial. Eligibility and pricing are two different questions, and a higher rate rarely means you no longer qualify unless the underlying numbers on your application shifted enough to change your risk tier.
How Rate Locks Work and When to Use One
A rate lock is a lender’s written commitment to honor a specific interest rate for a defined period, regardless of what happens in the broader market before closing. Lock periods commonly run 15, 30, 45, or 60 days, with longer locks typically carrying a slightly higher cost built into the rate or points. Many lenders also offer a float-down option, which allows you to capture a lower rate if the market improves after you lock, usually for a fee or a modest rate adjustment. Points, meanwhile, are upfront fees paid to buy down your rate permanently for the life of the loan, a separate decision from locking.
Timing matters. Locking before you have an accepted purchase contract is risky because if your closing timeline slips, or the deal falls through, you may face extension fees or lose the lock altogether and get repriced at current market rates. Most experienced originators recommend locking once you have a signed contract and a realistic closing date, giving you enough runway to close within the lock window without paying to extend it.
Duane Buziak’s rate comparison process reviews lock options and pricing across hundreds of wholesale lenders before you commit to one, without a credit inquiry. This matters because lock terms, float-down availability, and extension costs vary meaningfully from lender to lender, and a rate that looked competitive at pre-approval may not be the most competitive option once you’re ready to lock for real.
Comparing Your Options When a Rate Increase Hits Mid-Process
When a rate increase shows up mid-process, you generally have four paths. The right one depends on how far along you are, how much room is left in your timeline, and whether the increase is market-driven or file-driven.
- Stay and re-lock with your current lender: fastest option if your file is otherwise clean, but you’re accepting whatever new pricing they offer without a competing quote.
- Get a second opinion from Duane Buziak: a no-credit-hit comparison across hundreds of wholesale lenders can confirm whether your current offer is still competitive or whether better pricing is available.
- Request a float-down: if you’re already locked and rates have since dropped, ask whether your lock includes or allows a float-down adjustment.
- Delay closing: rarely ideal, since it risks lock extension fees and can jeopardize your purchase contract, but sometimes necessary if underwriting conditions take longer than expected.
Some large national originators, including Rocket and Movement, operate on a single rate sheet model, meaning the rate they quote you is the one rate available through that company on a given day, generally sourced from one hard credit pull. Veterans United operates similarly for VA-focused borrowers, sourcing pricing through its own platform rather than comparing across multiple wholesale channels. These are structural facts about how each company prices loans, not a judgment on service quality, and they’re worth knowing before you assume the first number you receive is the only one available to you.
For Virginia buyers, context matters too. The Federal Housing Finance Agency’s conforming loan limit data for 2026 sets the baseline for how much you can borrow with a conventional conforming loan before moving into jumbo pricing, and jumbo loans often carry different rate and lock structures altogether. If your loan amount is near that threshold, a rate increase can also reflect a shift between conforming and jumbo pricing tiers, not just market movement.
Frequently Asked Questions About Rate Changes After Pre-Approval
Can a lender change my rate after pre-approval? Yes. Pre-approval reflects an estimated rate, not a locked one, so pricing can change until you formally lock with a lender.
Does a rate increase void my pre-approval? No. A rate increase is a pricing issue, not an eligibility issue, unless your credit, income, or debt-to-income ratio changed enough to affect your qualification.
How long is a mortgage rate lock good for? Common lock periods run 15, 30, 45, or 60 days, with longer locks typically costing more.
Why did my rate go up during underwriting? Usually because the loan hadn’t been locked yet, and the broader bond market moved, per Freddie Mac’s weekly PMMS data.
What is a float-down option? A feature some lenders offer that lets you capture a lower rate after locking if the market improves before closing, usually for a fee.
Should I lock my rate before finding a house? Generally no, since locking before an accepted contract risks extension fees if your timeline shifts before you close.
What happens if my closing is delayed past my lock expiration? Most lenders offer a paid extension option; without one, your loan may be repriced at current market rates, which could be higher or lower than your original lock.
Is pre-approval the same as a locked rate? No. Pre-approval confirms eligibility and estimated terms; a lock is a contractual commitment to a specific rate for a set period, as outlined by the CFPB’s mortgage shopping resources.
Can I switch lenders if my rate increases after pre-approval? Yes, you’re not obligated to close with the lender who issued your pre-approval, and comparing a second opinion carries no penalty.
Will comparing rates with a second lender hurt my credit score? Not if the comparison is done without a hard credit pull; Duane Buziak’s rate comparison process is structured to avoid a credit hit during the shopping phase.
Licensing, Disclosures, and Getting a Second Look at Your Rate
The rate and payment figures in this article are illustrative examples only, not a quote or a commitment to lend. All loans are subject to credit approval, underwriting review, and program guidelines, and actual terms will vary based on your credit profile, loan amount, property, and market conditions at the time of application.
Duane Buziak, Mortgage Maestro, is licensed in Virginia, Florida, Tennessee, Georgia, Washington D.C., North Carolina, South Carolina, and Maryland (South Carolina is broker-only). Comparisons run through Grand Rates by Duane Buziak carry no credit-hit requirement, giving you a clear look at current lock options before you commit.
Operated by Duane Buziak Mortgage Maestro, Coast2Coast Mortgage, LLC NMLS: 376205 / Duane Buziak NMLS#1110647 / NMLS Consumer Access / Legal Disclaimer, “Equal Housing Lender” This information is not intended to be an indication of loan qualification, loan approval or commitment to lend.
If your mortgage rate increased after pre-approval and you’re unsure whether to re-lock, extend, or shop elsewhere, don’t sign anything until you know what else is available. Get your free personalized rate comparison from Duane Buziak, an independent consultant recognized as one of Virginia’s top loan officers, with no credit impact, no obligation, and no hidden fees.
