A mortgage pre-approval is a written commitment from a lender stating how much they're willing to lend you, based on a full review of your income, assets, credit, and debts. It's meaningfully stronger than a pre-qualification, which is just a rough, self-reported estimate.
Sellers and real estate agents take pre-approved buyers far more seriously. In competitive markets, a pre-approval letter is essentially required just to get an offer considered — it tells the seller you can actually close, not just that you think you can afford the home.
How it works
To get pre-approved, you submit real documentation — pay stubs, W-2s or tax returns, bank statements — and the lender pulls your credit and runs the numbers through an actual underwriting engine, not just a calculator. The result is a specific approved loan amount and program, in writing.
Pre-approvals typically expire in a window of a couple of months, since credit reports and financial circumstances can change. If house shopping runs longer than that, you can usually refresh the pre-approval with updated documents rather than starting completely over.
A strong pre-approval letter states the exact loan amount, program, and any conditions clearly, so when you're ready to make an offer, your agent can attach it immediately and show the seller you're a serious, qualified buyer.
When it matters to you
Pre-approval matters before you start seriously touring homes — walking in without one wastes everyone's time and puts you at a real disadvantage the moment you find something you want to offer on.
It matters again any time your financial picture changes mid-search — a new job, a large purchase, or a dip in credit can all affect whether your pre-approval still holds.
Common mistakes
- Shopping for homes seriously before getting pre-approved, then losing a home to a buyer who was ready to move faster.
- Letting the pre-approval expire without refreshing it, and finding out at offer time that the numbers have changed.
- Taking on new debt or making a major purchase while pre-approved, which can jeopardize the approval before closing.
- Confusing a pre-approval with a guaranteed final approval — underwriting conditions can still arise before closing.
FAQs
How long does a pre-approval last?
Typically 60-90 days, since lenders rely on your credit and financial documentation staying current. If your search runs longer, ask your lender to refresh it with updated paperwork.
Does pre-approval guarantee my final loan approval?
No. It's a strong, document-backed estimate, but final approval still depends on underwriting conditions, the appraisal, and your financial picture staying the same through closing.
What documents do I need for pre-approval?
Typically recent pay stubs, W-2s or tax returns, bank statements, and authorization for the lender to pull your credit. Self-employed borrowers usually need additional documentation.