Home loan pre-approval: what it really guarantees
Pre-approval is the document buyers wave around at open homes, and the one most misunderstood. It is not a promise to lend you money. Knowing exactly what it does and does not cover is the difference between bidding with confidence and losing a deposit.
What pre-approval actually is
Pre-approval — sometimes called conditional approval or approval in principle — is a lender's indication that, based on the information you have given them, they would likely lend you up to a certain amount.
The operative word is conditional. The lender has assessed you. It has not yet assessed the property, and it has not made a final commitment.
A useful way to think about it: pre-approval says the lender is comfortable with you. Unconditional approval says the lender is comfortable with you and this specific property. Only the second one is a commitment.
The three things it does not protect you from
This is where buyers get caught, and it is almost always one of these three.
- The valuation comes in low. You agree to pay $1,000,000. The lender's valuer says the property is worth $950,000. The lender lends against their figure, not yours — so you need to find the difference in cash.
- Your circumstances change. Changing jobs, starting a probation period, taking on a car loan, or even opening a new credit card between pre-approval and settlement can undo the assessment.
- The lender's policy changes. Lending criteria move. A policy you satisfied in March may not exist in June.
At auction there is no cooling-off period and the contract is unconditional the moment the hammer falls. If your finance then falls through, you can lose your deposit — typically 10% of the purchase price — and remain liable for further loss. Pre-approval alone is not a safe basis for bidding at auction without understanding these gaps.
How long it lasts
Most pre-approvals run for around three months, though this varies by lender. Renewing usually means re-submitting current payslips and statements, and the lender reassessing you against whatever its policy says at that time.
That renewal is not a formality. If your situation or the lender's rules have shifted, the number can come back lower than before — occasionally much lower.
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Why applying to several lenders backfires
A reasonable-sounding instinct is to get pre-approved with three or four lenders and see who offers the most. It usually works against you.
Each formal application can leave a credit enquiry on your file. A cluster of enquiries in a short window reads, to the next lender assessing you, as someone being repeatedly declined — regardless of what actually happened.
This is a large part of what a broker is for. We compare lender policies before an application is lodged, so you apply once, to the lender whose rules actually fit your situation — rather than discovering the mismatch through a decline.
What to do before you bid
- Ask whether your pre-approval is system-generated or fully assessed by a credit officer. The second is far more reliable, and the difference is not always volunteered.
- Get an independent read on the property's likely valuation before auction day, not after.
- Change nothing financially — no new cards, no car finance, no job moves — until settlement.
- Budget for the upfront costs the loan will not cover: stamp duty, legal fees, inspections, and LMI if your deposit is under 20%.
That last point catches more first home buyers than any other. Stamp duty is not part of your loan — it comes out of the same cash as your deposit.
Frequently asked questions
Does pre-approval guarantee I will get the loan?
No. It is conditional. The lender still has to value the property, confirm your circumstances have not changed, and apply its policy as it stands at the time. Only unconditional approval is a commitment.
How long does pre-approval last?
Usually around three months, depending on the lender. Renewal means submitting current documents and being reassessed — and the amount can come back different.
Will applying for pre-approval hurt my credit score?
A single formal application leaves an enquiry on your file, which is normal. Several in a short period is the problem — it can read as repeated declines to the next lender who looks.
Can I bid at auction with only pre-approval?
People do, but understand the risk. Auction contracts are unconditional with no cooling-off period. If finance falls through afterwards you can lose your deposit and still be liable for further loss.
Can you help in Mandarin, Cantonese or Vietnamese?
Yes. Our brokers work in all three, and will walk you through the lender's conditions in your own language before you commit to anything.
Helpful tools & guides
NSW Stamp Duty Calculator
The upfront cost your loan will not cover.
LMI Calculator
Your LVR, an estimated premium, and the deposit gap to avoid it.
First Home Buyer Grants NSW
The $10k grant, stamp duty exemption and 5% deposit scheme.
10 Questions Your Bank Won't Answer
Straight answers on rates, borrowing power and refinancing.
This article is general information only and does not take into account your objectives, financial situation or needs. Lender policies, pre-approval validity periods and assessment criteria differ between lenders and change over time. Nothing here is a promise of approval or a specific outcome. Speak with a qualified mortgage broker or your lender before acting on any of it.