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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsIf mortgage rates rise after your preapproval, first determine whether your rate is floating or formally locked. A preapproval by itself does not guarantee an interest rate. Check page one of your Loan Estimate and any written rate-lock agreement, then ask the lender for the rate available today, the lock expiration date, extension cost, and conditions that could change the locked rate. Compare the complete payment and closing costs you can afford rather than trying to predict where rates will go.
Does mortgage preapproval lock in your interest rate?
Usually, no. Preapproval means a lender has reviewed information about your income, assets, debts and credit and is willing to consider a loan up to stated limits. It is not the same as a rate lock or final loan approval.
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Consumer Financial Protection Bureau guidance states: “If your rate is not locked, it can change at any time.” Mortgage rates may move daily or even hourly. A market increase after preapproval can therefore raise the rate offered to you, your monthly principal-and-interest payment, your annual percentage rate (APR), or the cash needed for points.
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Look at page one of the Loan Estimate for the interest-rate section and the date through which a lock applies, if one exists. Also read the lender’s separate written lock agreement. Some lenders lock when they issue a Loan Estimate; others require you to state that you intend to proceed or complete another step. A Loan Estimate is an early disclosure, not a final approval or a promise that every term will remain unchanged.
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What to do immediately when rates rise
- Confirm the current status. Ask whether your application is floating, locked, or subject to a conditional lock. Request the answer in writing.
- Locate the expiration date. A lock should identify the date and, in some cases, the time by which you must close. Do not assume it lasts until your contract closing date.
- Request a new quote. Ask for today’s rate, APR, points, lender credits, estimated monthly payment, and cash to close for the same loan type and term in your preapproval.
- Recheck your budget. Use the updated payment and cash-to-close figures to decide whether the home still fits your limits.
- Document every change. Save the Loan Estimate, lock confirmation, fee worksheet and written explanations from the lender.
If your rate is floating, ask for exact lock terms
When a rate is not locked, request the lender’s available lock options rather than relying on a verbal promise. CFPB describes 30-, 45- and 60-day periods as typical, with longer periods sometimes available. These are common choices, not a requirement that every lender offer them.
Questions to ask the loan officer
- What interest rate and APR can I lock today?
- How many points or lender credits are included, and what fees are charged for the lock?
- How long does the lock last, and exactly when does it expire?
- Is a shorter or longer lock available, and how does the price differ?
- What happens if underwriting, appraisal, title work or another closing task takes longer than expected?
- What is the extension fee, how is it calculated, and who pays it if the delay is not my fault?
- Can the rate change after locking if the loan amount, down payment, credit score, appraisal or verified income changes?
- If rates fall, is a float-down option available? What are its timing, pricing and eligibility conditions?
Lock policies vary by lender. A float-down, free extension or automatic renewal should never be assumed unless the written agreement provides it.
How a rate lock protects you—and its limits
CFPB defines a lock-in or rate lock this way: “A lock-in or rate lock on a mortgage loan means that your interest rate won’t change between the offer and closing, as long as you close within the specified time frame and there are no changes to your application.” The statement was published on the CFPB consumer guidance page “What’s a lock-in or a rate lock on a mortgage?” last reviewed May 2, 2023.
The protection is therefore conditional. You generally must close before the lock expires and keep the transaction materially consistent with the locked application. A revised loan amount, different down payment, lower credit score, appraisal issue, change in verified income or other material change can require the lender to reprice the loan or re-underwrite it. Ask the lender which events trigger a new rate before you sign.
If you are already locked
Ask the lender to confirm the locked rate, points, lock date, expiration date and any conditions in writing. Continue supplying documents promptly and avoid financial moves that could alter your credit or debt profile. A lock does not remove the need to satisfy underwriting, appraisal, title and closing requirements.
Compare offers on equal terms
If your closing timeline allows, request Loan Estimates from more than one lender for the same kind of loan. Comparing only the headline rate can hide a higher upfront cost, a larger payment or a lock that expires sooner. Use the same loan amount, term, down payment and product type when asking for quotes.
| Comparison item | What to put side by side | Why it matters |
|---|---|---|
| Rate and APR | Interest rate, APR, discount points and lender credits | A lower rate can require more points; credits can reduce cash needed while increasing the rate. |
| Payment and cash to close | Monthly principal-and-interest payment, total estimated payment and cash required at closing | These figures show whether the loan fits both monthly and upfront budgets. |
| Loan structure | Loan type, term, amount and down-payment assumptions | A quote is meaningful only when the underlying loan terms match. |
| Lock period | Length of the lock and exact expiration date | A shorter lock may cost less but leaves less time for processing. |
| Extension terms | Extension availability, fee and method of calculation | A delayed closing can create a significant additional cost. |
| Processing timeline | Whether the lender expects to complete underwriting and closing before expiration | A cheaper offer is less useful if its lock is likely to expire before closing. |
Switching lenders can restart parts of the application, appraisal or documentation process and may jeopardize the purchase contract’s closing date. Treat the time required to change lenders as a real cost, not an afterthought.
Recheck affordability with the higher rate
Recalculate the payment using the lender’s current quote, not the rate shown on an earlier preapproval. Include principal and interest, property taxes, homeowners insurance, mortgage insurance when applicable, homeowners-association dues and any other recurring housing costs in your budget review.
Also compare the revised cash-to-close figure with your available funds. A rate increase may affect more than the monthly payment if you are considering discount points, lender credits or a different down payment. Keep an emergency reserve after closing rather than using every available dollar to preserve the original payment.
Online rate examples can illustrate how a payment changes under stated assumptions, but they are not personal quotes. No public calculator can establish the rate you will qualify for, and official guidance does not support predicting that rates will fall. Your lender must provide current pricing for your specific application.
What happens if your rate lock expires before closing?
Contact the lender as soon as you see that the closing date may extend beyond the lock-through date. Ask for the written options and prices before the expiration occurs.
Possible outcomes
- Extension: The lender may extend the existing lock for a stated fee or for a limited period. The agreement should explain how the fee is calculated and when it is charged.
- Re-lock at current pricing: The loan may be repriced at the market rate available when the old lock ends. If rates rose, the new payment and cash-to-close figures could be higher.
- Conditional lender accommodation: Some lenders may waive or reduce an extension charge in specific circumstances, but this is policy-specific and must be confirmed in writing.
- Closing-date change: You and the seller may need to amend the contract. Check whether the purchase agreement imposes penalties or deadlines.
Ask what happens if the delay results from the lender, the appraisal, title work, the seller or another party. Responsibility for an extension fee depends on the lender’s policy and the contract; do not assume the cost will be waived.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Read every revised Loan Estimate
A changed Loan Estimate deserves an explanation. Ask the lender why it was issued and request a line-by-line description of how the change affects:
- interest rate and APR;
- monthly payment;
- points, lender credits and other loan charges;
- cash to close;
- loan amount, term or product features; and
- the lock status and expiration date.
Keep the revised disclosure with the earlier version so you can identify what moved. If a change is connected to a new appraisal, income verification, credit report or loan amount, ask which application fact caused the repricing and whether another option is available.
Should you lock your mortgage rate now?
There is no universal best day to lock. The practical decision is whether the quoted payment and total costs are affordable and whether the lock period gives the lender enough time to close.
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A lock may fit when
- the payment and cash to close remain within your budget;
- your closing schedule is reasonably established;
- the lender can complete processing before the lock expires; and
- you prefer certainty over the possibility of benefiting from a future rate drop.
Ask for more information before locking when
- the closing date is uncertain;
- the lock is much shorter than the expected processing time;
- extension costs are unclear;
- the rate is affordable only with points or a large lender credit; or
- you are considering another lender with materially different fees or timing.
Do not delay solely because you expect rates to fall. Likewise, do not lock solely because rates rose this morning. Base the choice on documented terms, your ability to carry the payment and the likelihood that the transaction can close within the lock period.
Common mistakes to avoid
- Treating preapproval as a guarantee: Preapproval does not establish a permanent rate or final loan approval.
- Comparing unlike loans: A quote for a different term, loan type or down payment can appear cheaper without being a real alternative.
- Ignoring points and credits: The lowest rate may require substantial upfront points; the highest credit may raise the rate.
- Waiting until expiration week: Underwriting, appraisal and title delays can make an extension expensive or impossible.
- Assuming a float-down exists: It is an optional feature with lender-specific conditions.
- Making major financial changes: New debt, a job change or a large credit-card balance can affect underwriting and pricing.
- Relying on phone assurances: Ask for the lock and any exceptions in written form.
U.S. scope and transaction limits
This guidance is based on U.S. consumer mortgage information from the Consumer Financial Protection Bureau. The Loan Estimate process applies to most mortgages, not every type of loan, and lock practices differ by lender and transaction. Other countries and some specialized U.S. products use different disclosures and rules. Current pricing, qualification and lock availability must come from the lender handling your application.
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