Auction-day due diligence: the buyer's checklist
Before you bid, have the contract and disclosure reviewed, put any agreed changes in writing and understand the building report, including the areas it could not cover. Ask your lender or broker how valuation, property type and the final price affect approval. Check how the deposit must be paid and write down a hard limit that already includes the immediate work and buying costs.
- 01ContractRead properly, with any agreed changes in writing
- 02BuildingThe report understood, and every flag chased down
- 03MoneyFinance for this property, the deposit ready, a limit you wrote down
Bid only when every gate is green.
Why an auction is different
When the hammer falls, you are generally bound, and there is usually no cooling-off to save you. So the contract, the finance and the physical checks all get finished first.
In Victoria, the official cooling-off guidance excludes auction purchases and purchases within three clear business days before or after a public auction. Have your adviser confirm the timing and contract in your state. See cooling-off periods by state for orientation.
The checks to clear before you bid
- Contract and state disclosure reviewed by your conveyancer or solicitor, including the Section 32 vendor statement in Victoria where applicable.
- Building report understood, including the important findings, blind spots and any limits on your right to rely on it.
- Property-specific finance readiness, lender conditions, valuation risk, funds to complete and buffer understood.
- Deposit mechanics confirmed, the amount is set by the contract, with payment timing and method checked with the agent.
- Your maximum price set in writing, with a plan to stop there, whatever the room does.
Contract and state disclosure
Have a conveyancer or solicitor review the vendor statement and contract early. Ask about title, settlement, deposit, inclusions, adjustments, default terms and special conditions. If the seller agrees to a change, have it recorded in the contract before you bid. Tell your legal adviser about any representation that affects your decision. For the document bundle, use the guide to the NSW contract for sale or Queensland Form 2 disclosure where relevant.
Building and pest, done in advance
Understand the building before you bid. Check a vendor report's date, scope, access, inspector, insurance and buyer-reliance terms. Commission your own work if those details leave important gaps. The guide to pre-auction building inspection explains timing, access and reliance on a supplied report.
Property-specific finance readiness
A pre-approval is usually conditional on valuation, final checks and an acceptable property. Give the lender or broker the property type, address, contract and intended price range. Confirm outstanding conditions, valuation-shortfall funding and the cash needed for deposit, duty, costs and settlement. Set a conservative limit and contingency.
Deposit and your limit
The contract sets the deposit amount and due time. Confirm the agent's payment method and daily transfer limits, then record any negotiated change before bidding. Include acquisition costs, immediate work and a finance buffer in the maximum price.
What happens if you win and can't settle
If you win and then cannot settle, the deposit is at risk and the seller’s losses, including any shortfall on a resale, can follow you home. That is the whole reason the gates come before the bidding.
A completed checklist needs evidence behind each tick
'Contract checked' can mean that a document was emailed, a preliminary review was received or the final version was actually cleared for your proposed terms. These are different states. Record the version, the person who reviewed it, outstanding questions and any agreed change. Apply the same discipline to finance and condition: a booked appointment is not a completed investigation, and an unanswered email is not confirmation.
| Area | Useful confirmation | Open dependency |
|---|---|---|
| Contract | Your adviser has reviewed the version and terms you would accept | A requested change remains unagreed or the version changed |
| Building | Material findings and access limits have been considered | A significant investigation is still outstanding |
| Finance | Your lender or broker has explained the property-specific position and remaining conditions | Funds depend on an untested assumption |
| Deposit | Amount, due time, method and available funds are established | A transfer limit or unavailable account prevents payment |
| Maximum bid | A written limit reflects the complete purchase and known obligations | The limit assumes a repair or approval outcome not established |
Some uncertainty is an allowance; some changes the decision
A quotation for a defined repair is different from an unknown structural scope. You may be able to allow for the first after checking inclusions and contingency. The second might involve a range too wide to price sensibly before bidding. A smaller bid does not make an unsafe condition, unavailable finance or an essential but unapproved alteration acceptable.
Ask whether the unresolved point could change your ability to use, insure, fund or afford the home, and what evidence would settle it. If that evidence cannot arrive before the commitment, decide whether you can knowingly accept the uncertainty or should not bid. Do not manufacture a percentage allowance merely to make the checklist look complete. Technical uncertainty and personal capacity to carry it are separate questions.
Reconcile the money once, without spending the same buffer twice
Use one purchase worksheet shared with your broker or lender where appropriate. Keep purchase price, acquisition expenses, deposit timing, settlement funds and post-purchase work separate. The deposit is normally part of the price rather than an additional purchase cost, but it must be available when due. Duty, legal expenses, adjustments and any other applicable costs need their own provision.
A repair reserve and a valuation-shortfall reserve may compete for the same available cash. Ask what happens if both are needed. Moneysmart's home-buying guidance places borrowing and buying costs within the preparation process. Your actual lender's conditions and your funds determine readiness; a general affordability estimate cannot confirm approval for this property at a particular price.
Agree who can bid and what can change on the day
Where partners or another bidder are involved, agree the limit and who has authority to act before the auction. Confirm registration, identification and representation requirements with the agent and legal adviser. NSW's auction guidance sets out its bidder-registration and authority requirements. Use the process in the property's state, including the arrangements for remote bidding where relevant.
Have a way to contact your adviser if the contract, inclusions, settlement date or an important representation changes. An attractive concession can still require review: extra time to settle might help one arrangement while conflicting with another. Keep any accepted variation in the operative documents. A rushed verbal explanation from someone in the crowd should not replace advice on the terms you will be bound by.
Passed in does not mean the investigation clock resets
A post-auction negotiation can feel like a private sale with more breathing room. Confirm the legal position before treating it that way. Victoria's official guidance describes the auction-related cooling-off exclusion, while NSW's auction guidance also addresses a same-day exchange after a property is passed in. The calendar and transaction matter; use your adviser to establish the actual rights and deadline.
A lower negotiated price changes the price. It does not automatically change a defect's cause, complete missing records or add a finance condition. Reuse the same decision sheet and record what has genuinely changed. If further investigation or a condition is needed, have your adviser seek an agreed contractual arrangement before commitment rather than assuming one will be available afterwards.
Worked example: the last concession is not a completed check
Illustrative reasoning example, not an inspected property. A property is passed in and the seller offers a lower price. The buyer has a pest report recommending further access behind a lined subfloor area. A contractor has quoted for treatment, and the buyer interprets the discount as enough to cover the issue.
The treatment quotation and potential damage extent answer different questions. The price reduction does not establish the condition of hidden timber or the repair scope. Ask whether the inspection gap could materially change the purchase budget or use of the home, and have the adviser confirm the proposed contract's position.
If suitable access and assessment can be obtained under an agreed arrangement, the new evidence can inform the decision. If not, the buyer must assess an unresolved exposure rather than call it a known treatment bill. The ability to walk away is part of preparation; previous inspection spending does not make the next commitment safer.
A useful auction-day record ends with what is ready, what is still conditional and the decision those facts support. The purpose is to keep the final bid connected to the work already done.
Frequently asked questions
Can I make an auction purchase subject to finance or inspection?
A seller may agree to contract changes before the auction. Have each requested change negotiated and documented by the legal representatives before bidding.
Is there a cooling-off period if I buy at auction?
Cooling-off is generally unavailable for auction purchases. In Victoria, the exclusion also covers purchases within three clear business days before or after the scheduled auction.
Do I need a building inspection before auction?
If condition could change your decision or maximum bid, obtain an appropriately scoped inspection early enough to assess its findings and blind spots. Test any vendor report's date, access, commissioning party and purchaser-reliance terms.
Is pre-approval enough to bid at auction?
Not by itself. Ask the lender what conditions remain, whether this property is acceptable to them, what happens if the valuation comes in short, and whether you hold the funds and buffer to complete at your intended price.
What happens if I win and then can't settle?
You risk forfeiting the deposit and may be liable for the seller's losses, including a resale shortfall.
How much deposit do I need at auction?
The contract sets the amount. Check the due time and payment method, and document any agreed change before bidding.
Does a passed-in property have normal cooling-off rights?
Do not assume so. Auction-related exclusions differ by state and can extend to negotiations around the auction. Have your adviser confirm the actual transaction and timing before signing.
Can I just lower my bid to allow for an inaccessible area?
Only if you can meaningfully assess and carry the resulting uncertainty. A discount does not establish the repair scope or resolve a safety, finance or essential-use problem.
What should I do if the contract changes on auction day?
Have your legal adviser assess the changed terms before you commit. Confirm that any agreed change appears in the version you would accept.
How this guide was researched
A pre-bid decision guide separating completed checks, bounded allowances and unresolved dependencies. State auction examples are explicitly local; legal and lending questions remain with the relevant advisers.
Limits: General Australian guidance only. Contracts, statutes, policies, site conditions and professional scopes vary; obtain advice for the property and decision in front of you.
Sources
- Buying property by private saleConsumer Affairs Victoria · accessed 2026-07-19
- Buying a houseASIC Moneysmart · accessed 2026-09-07
- Buying property at an auctionNSW Government · accessed 2026-09-07
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