Mortgage Pre-Approval

A mortgage pre-approval is a lender’s written confirmation that you can borrow a specific amount of money at a specific rate, based on a thorough review of your credit, income, assets, and liabilities. It differs from a pre-qualification—which is a rough estimate—in that it involves actual document verification and puts the lender’s reputation behind the number.

Why pre-approval matters before you make an offer

When you’re ready to buy a home, a pre-approval letter signals to a seller that you are a serious, vetted buyer. In competitive markets, many sellers will not negotiate with an unvetted buyer or will discount an offer made without proof of funding. The pre-approval shortens the path to closing by removing a major contingency early: the lender has already confirmed you can borrow the money.

Pre-approval is distinct from pre-qualification, which requires no documentation—a lender or broker simply asks you your income and debts, plugs them into a calculator, and tells you a rough number. Pre-qualification is useful for budgeting but carries no weight with a seller. Pre-approval, by contrast, binds the lender (with limited conditions) and binds you (you’ve authorized a hard credit pull and the lender has your documented word).

What underwriting involves

To issue a pre-approval, a lender pulls your credit report, requests recent pay stubs and tax returns, verifies your employment, and often reviews bank and investment statements. The goal is to confirm that your debt-to-income ratio, credit history, and cost of debt, and reserves (liquid savings beyond the down payment) all meet the lender’s internal guidelines.

The lender typically requires a debt-to-income ratio below 43 per cent—meaning your total monthly debt payments (car loans, credit cards, student loans, plus the new mortgage) should not exceed 43 per cent of your gross monthly income. Some lenders are more lenient if you have strong credit and savings; others are stricter. A pre-approval is conditional on these factors remaining unchanged: if you take on new debt, lose your job, or fail to explain a large deposit before closing, the approval can be revoked.

The lender also locks or “float” your interest rate during the pre-approval period (usually 30 to 90 days). A locked rate is yours to claim; if rates drop, you’re bound to the higher rate. If you don’t lock, your rate may shift if market conditions change before you close.

Rate locks and conditional approval

A pre-approval letter will state whether the quoted rate is locked for a fixed period—say, 45 days—or available subject to market movement. Some lenders offer a “float down” option: you don’t lock, but if rates fall during your pre-approval window, you can lock at the lower rate (though you may pay a fee for this privilege).

The approval itself is almost never truly unconditional. Common conditions include verification of employment on or shortly before closing, final appraisal of the home, and title search confirming no liens or claims. These are routine; they rarely kill a deal. More serious conditions—such as “provide bank statements for the last two months” or “explain the $15,000 transfer into your savings account”—require your action and can delay closing if you drag your feet.

How pre-approval affects your offer

In many markets, sellers review pre-approval letters as part of the offer process. A strong pre-approval—no conditions, rate locked, large cash reserves shown—can tip the scales in your favour if multiple bids are on the table. Some sellers will not even accept an offer without a pre-approval letter attached.

Once an offer is accepted, the lender will order a formal appraisal of the home to ensure it’s worth the loan amount. If the appraisal comes in low—the home is worth less than the purchase price—the lender may refuse to fund the full amount, forcing you to renegotiate or walk away. This is why a pre-approval, though powerful, is not a guarantee: it guarantees you qualify for the money, not that the specific house you later choose will appraise for the loan amount.

Timeline and costs

Obtaining a pre-approval usually takes 1 to 3 business days once you’ve submitted all documents. Some lenders offer same-day approvals with digital document submission. The letter will specify how long the pre-approval is valid—typically 30, 60, or 90 days. If you haven’t found a home and made an offer within that window, you’ll need to resubmit documents and renew your approval. If your financial situation has improved (higher income, lower debts, better credit score), a renewal can increase your approved amount.

Most pre-approvals are free, though some lenders charge $100–500 for a credit check or appraisal fee at this stage. These costs are negotiable; many lenders waive them if you move forward with them for the full mortgage.

Pre-approval vs. full approval

Pre-approval is the starting gate; full approval comes after you’ve made an offer and the home has been appraised and inspected. At full approval, the lender commits to funding the loan in a specific amount for a specific property. Between pre-approval and full approval, many things can change—your credit score, your job status, new debts, or issues with the property itself (structural damage, title problems). The transition from pre-approval to full approval is where most deals either advance or stall.

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