Knowledge Hub · Buying Guide

Pre-approval: what it guarantees and what it doesn't

A pre-approval tells you roughly how much you can borrow and generally holds an interest rate for up to 120 days. It's an essential first step, but it isn't a guarantee. The lender still has to approve the specific property, verify your documents, and confirm nothing has changed before the deal is final.

By Christian Torok, Broker, Porchlight Realty (RE/MAX Hallmark) · Reviewed

October 22, 2026

What a pre-approval gives you:

  • A maximum mortgage amount, based on your income, debts, credit and down payment.
  • A rate hold, so if rates rise while you're looking, you're protected.
  • Early warning of problems, like credit issues, documentation gaps or down payment questions, while there's still time to fix them.
  • Credibility with sellers, who take buyers with financing in place more seriously.

What it doesn't guarantee. A lender can still say no after you've been pre-approved. The most common reasons:

  • The property. The lender has to be satisfied with the house itself and its appraised value. If the appraisal comes in below the price, you cover the gap.
  • Changes in your situation. A new job, a new car loan or a missed payment between pre-approval and closing can change the answer.
  • Documents. The pre-approval is based on what you told the lender; the final approval is based on what you can prove.

How to protect yourself. Don't take on new debt or change jobs between pre-approval and closing without talking to your lender first. Keep your broker in the loop as soon as you're serious about a property. And if you're going firm, confirm the details with your lender before you sign, not after.

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