Mortgage Pre-Approval Letters: What They Prove and How Long They Last

A pre-approval letter tells sellers that a lender has looked at your finances and is willing to consider lending you a stated amount. This guide explains what the letter actually proves, how long it lasts, and how to get one without tying yourself to a single lender.

Key takeaways

• Prequalification is an estimate based on what you tell a lender. Pre-approval means the lender has reviewed documents and usually pulled your credit.
• Most pre-approval letters are valid for a limited period, often somewhere between 30 and 90 days, and the lender sets the exact window.
• A pre-approval is not a rate lock and not a promise to lend. Final approval depends on the property, an appraisal and full underwriting.
• Getting pre-approved with one lender does not obligate you to close with that lender. You can compare others at any point before you commit.

What is a mortgage pre-approval letter?

A pre-approval letter is a written statement from a lender. It says that, based on the information reviewed so far, the lender is willing to consider a loan up to a stated amount. It usually names the loan type, the maximum loan amount or purchase price, and an expiration date.

The letter is written for two audiences. You use it to understand what price range a lender is comfortable with. Sellers and listing agents read it as a sign that real financing groundwork stands behind your offer.

What does a lender check for a pre-approval?

Practices vary by lender, but a standard pre-approval usually involves a credit pull and a review of documents. Common items include recent pay stubs, W-2s or tax returns, bank statements and a list of your monthly debts. From those, the lender estimates your debt-to-income ratio and the payment it believes you can carry. For how that ratio is built, see how lenders calculate debt-to-income.

The credit check for a pre-approval is often a hard inquiry, though some lenders use a soft pull at this stage. Scoring models generally treat several mortgage inquiries inside a short window as one event, as covered in rate shopping without hurting your credit.

What is the difference between prequalification and pre-approval?

A prequalification is an estimate based on what you tell the lender, while a pre-approval means the lender has reviewed documents and usually pulled your credit. An underwritten pre-approval goes one step further. Lenders do not always use these terms the same way, so the useful way to sort them is by how much has been verified.

Prequalification

A prequalification is an informal estimate. You tell the lender your income, debts and rough credit standing, and the lender tells you what you might qualify for. Little or nothing is verified, and there may be no credit pull, though some lenders do check credit at this stage. It is a quick way to size up a budget, but it carries little weight with a seller.

Pre-approval

A pre-approval goes further. The lender reviews documents, pulls credit and issues a letter with a specific amount and an expiration date. This is what most sellers expect to see with an offer. It still leaves the property side open, since no home has been appraised and the file has not been through final underwriting.

Underwritten pre-approval

Some lenders offer a stronger version, often called an underwritten, verified or fully underwritten pre-approval. Here an underwriter reviews your file before you find a home, so the remaining conditions relate mostly to the property itself. Names and coverage vary, so it helps to ask the lender exactly what has been reviewed.

How long is a mortgage pre-approval good for?

Most pre-approval letters carry an expiration date. Windows between 30 and 90 days are common, and some lenders go longer. The expiration exists because the documents behind the letter age. Pay stubs and bank statements go stale, credit reports have their own shelf life under the lender's program rules, and your circumstances can change.

The date on the letter is set by the lender, so treat it as the number that counts. If two lenders offer different validity periods, that is a real difference worth noting.

How do you update or renew a pre-approval?

Renewing is usually simpler than starting over. The lender asks for fresh copies of the documents that have aged, may pull credit again, and issues a new letter with a new date. Many borrowers also ask for an updated letter when something meaningful changes, such as a raise, a paid-off car loan or a larger down payment.

Is a pre-approval a rate commitment or a promise to lend?

No on both counts.

A pre-approval letter may mention a rate, but that rate is an estimate at the time the letter was written. Rates move daily. A rate only becomes fixed through a separate rate lock agreement, often once you have a property under contract. The details of how locks work are in mortgage rate locks explained. A pre-approval, on its own, locks nothing.

It is also not a promise that the loan will close. Final approval depends on an appraisal that supports the price, a title review, a check that your finances have not changed, and full underwriting. Letters routinely say the approval is conditional for exactly this reason. New debt, a job change or a large unexplained deposit between pre-approval and closing can all change the outcome.

How do sellers read a pre-approval letter?

Sellers and their agents look at whether the letter exists, which lender issued it, the amount, the date, and how much was actually verified. An offer without a letter is harder to take seriously, and an informal estimate carries less weight than a documented pre-approval. An underwritten pre-approval tends to read as stronger because fewer things can go wrong after the offer is accepted.

Some agents may also call the loan officer to ask how solid the file is. That is a common practice. Sellers cannot see your full financial picture, and a letter written at or near your offer price keeps your negotiating room private.

Does getting pre-approved commit you to a lender?

No. A pre-approval letter is the lender's conditional statement about you. It is not a contract that binds you to them. You can hold a pre-approval from one lender and still apply with another, compare terms, and choose whichever fits.

Two things are worth knowing before you switch. If you paid a credit report fee, it is usually not refunded. A new lender will also need its own documents and credit pull, which the shopping window generally absorbs.

Running a pre-approval auction on HomeTurf

On HomeTurf, a pre-approval auction is built for exactly this stage, before you have a signed contract. You post once and share your financial profile as ranges: a credit score band, an income range and a loan amount range. You also give your target state, timeline and property type. Your name and contact details stay private.

N.M.L.S.-verified lenders then compete on estimated rates, validity periods, and whether they can offer a rate lock once you find a property. Their rates, A.P.R.s, fees and points are shown exactly, and they cannot pay for placement. HomeTurf does not select or recommend a lender and does not check your credit. If you choose a winning lender, only that lender receives your contact information. It then works with you directly to verify documents and issue the actual letter. Estimates can change once a property is chosen and the lender underwrites the full file.

Challenging a pre-approval you already hold

If you already hold a pre-approval, a Beat My Rate auction lets you post its terms as an anonymous benchmark and see whether competing lenders improve on them. Your existing lender's name is never shared. How the two auction types differ is laid out in pre-approval vs Beat My Rate.

Frequently asked questions

How long does a pre-approval letter last?

Most pre-approval letters are valid for a fixed period set by the lender, and windows between 30 and 90 days are common. When a letter expires, the lender can usually renew it with updated documents and, in many cases, a fresh credit check.

Is prequalification the same as pre-approval?

No. A prequalification is an estimate based on information you provide, often without a credit check or document review. A pre-approval means the lender has reviewed documents and usually pulled your credit before issuing a letter with a specific amount and expiration date. Sellers generally give more weight to a pre-approval.

Does getting pre-approved commit me to a lender?

No. A pre-approval is a conditional statement from the lender about your finances, not a contract that obligates you to borrow from them. You can compare other lenders and choose a different one at any point before you commit to a loan.

Does a pre-approval lock my interest rate?

No. Any rate mentioned in a pre-approval letter is an estimate as of the date it was written. A rate is only fixed through a separate rate lock agreement, which lenders typically offer once you have a property under contract. The lender confirms its lock terms and any cost.

Can I get pre-approved by more than one lender?

Yes. Many borrowers get pre-approved with more than one lender to compare terms. Each lender needs its own documents and credit pull, but scoring models generally treat several mortgage inquiries in a short window as one event. The Consumer Financial Protection Bureau describes that window as 45 days.

What happens if my pre-approval expires before I find a home?

An expired letter does not carry a penalty. It simply stops being useful to sellers. The lender can typically issue a new letter after reviewing updated pay stubs, bank statements and, if needed, a fresh credit report. If your finances changed, the new amount may differ.

Let verified lenders compete for your pre-approval

A pre-approval letter is a starting point, not a commitment, and the lender who writes it is not the only one you can work with. On HomeTurf, several N.M.L.S.-verified lenders compete for your pre-approval based on banded, anonymous information. You compare their exact terms side by side, and the choice is always yours. HomeTurf is available in a growing number of states.

When you are ready to see what verified lenders will offer, you can Start Your Auction. HomeTurf is a technology marketplace, not a lender, and it is free for borrowers.

Remember that this is general information, not financial advice, and every situation is different.

HomeTurf is a technology marketplace, not a lender or loan originator. This content is for general information only and is not financial or legal advice.