Private treaty is the standard method of sale in Perth, where buyers submit written offers through the agent on an Offer and Acceptance form, while auction is a public sale on a fixed date with an unconditional contract at the fall of the hammer. Both are legitimate in Western Australia, but they place completely different demands on the buyer, and that is what decides which one is right for your property.
This guide sets the two methods side by side: how each one actually runs in WA, what happens to finance and inspection conditions under each, when an auction genuinely earns its place, and what to weigh up before you commit to a campaign this spring.
What is the difference between an auction and a private treaty sale in WA?
The core difference is conditionality. A private treaty offer can be made subject to finance, inspections or the sale of another property, and an auction bid cannot be.
| Private treaty | Auction | |
|---|---|---|
| How buyers bid | Written offers submitted through the agent on an Offer and Acceptance form | Open bidding on the day, conducted by a licensed auctioneer |
| Price shown | An asking price, price range or invitation for offers | No price disclosed; a reserve is set privately by the seller |
| Conditions allowed | Finance, building and pest, sale of an existing property, repairs | None; the contract is unconditional |
| When it becomes binding | When buyer and seller have agreed every term and signed | Immediately at the fall of the hammer |
| Deposit | As negotiated in the contract | Required at the close of the auction, about 10 per cent |
| Cooling off | None in WA | None in WA |
| Timeframe | Runs until a suitable offer is accepted | Fixed campaign ending on auction day |
| If it does not sell | The campaign continues, price or strategy is reviewed | Passed in; the agent may negotiate privately with bidders |
Two points in that table catch sellers out. First, Western Australia has no cooling-off period for real estate contracts under either method (Consumer Protection WA). Second, at auction the purchase cannot be conditional on finance approval, and the successful bidder must nominate a settlement agent immediately (Consumer Protection WA). That single rule removes a large share of the buyer pool before bidding even starts.
Which way do most Perth homes actually sell?
Private treaty. Perth has never adopted auction as its default the way Sydney and Melbourne did, and the great majority of residential sales here are negotiated through Offer and Acceptance. Most of the auction advice a Perth seller finds online is written for east coast markets and does not describe how homes trade in this city.
That matters more than usual right now. REIWA’s Perth metro snapshot for the week ending 20 September 2026 recorded 7,755 properties listed for sale against 2,929 in the same week a year earlier, with weekly sales at 634 compared with 862 (REIWA Perth market insights, accessed 22 September 2026). Auctions perform best when scarcity creates competition. In a market where buyers have this much choice, a method that narrows your buyer pool needs a specific reason behind it.
How does a private treaty sale work in Western Australia?
A buyer submits a written offer through the agent, the seller accepts, counters or declines, and the contract becomes binding only once both parties have agreed every term.
The mechanics are prescribed more tightly than most sellers expect.
- The agent must communicate all written offers to the seller. You are entitled to see every one.
- You are free to accept or decline any offer, regardless of the order they arrived in. There is no obligation to take the first, or the highest.
- Counter offers are made by amending the Offer and Acceptance. Every change must be initialled and dated by both parties, and the document signed and dated in full, or the change is not binding.
- The contract is not binding until all terms are agreed. Price is one term among several. A deposit amount, settlement date or special condition that is still open means there is no contract yet.
- Conditions are negotiable. A buyer may ask for finance approval, a building or timber pest inspection, the sale of their existing property, or repairs to something broken.
All of that is set out in Consumer Protection WA’s guidance on buying property by private sale and its property contracts page.
The practical advantage for a seller is control. You see the full terms of each offer before you decide, you can negotiate a settlement date that suits your own move, and a buyer who needs finance can still compete for your property.
How does a property auction work in WA?
An auction is a public sale run by a licensed auctioneer, where the property sells to the highest bidder provided the bid exceeds the reserve price the seller has set privately.
The sequence, per Consumer Protection WA:
- Before the day, buyers do their own research, arrange pre-approved finance and organise a settlement agent, because there is no opportunity to make the purchase conditional afterwards.
- The auctioneer reads the Auction Particulars and Conditions of Sale of Freehold Property form aloud before bidding opens. It sets out the title, the location, chattels, encumbrances or restrictions, zoning and use, any tenancy agreement, payment arrangements, and whether the seller intends to make vendor bids and how many.
- Bidding opens and rises progressively. The reserve is not disclosed to bidders, though the auctioneer announces when it has been reached.
- The highest bidder signs the contract immediately. The auctioneer signs on behalf of the seller.
- A deposit of about 10 per cent is paid at the close. The balance is due at settlement, usually around 30 days later, on the date written into the conditions of sale.
- If the reserve is not met the property is passed in, and the agent or auctioneer may negotiate privately with bidders.
The seller’s advantage is a hard deadline and complete transparency of competition. The cost is a smaller field of eligible buyers and a campaign that publicly succeeds or fails on one afternoon.
When does an auction make sense for a Perth seller?
An auction earns its place when the property is genuinely hard to price and likely to attract several cash-ready or pre-approved buyers. Those two conditions have to hold together.
Situations where it can work:
- Properties with no clear comparable sales. An unusual riverside site, a heritage home, a large development-potential block or a prestige property where the market, not a pricing model, should set the number.
- Deceased estates and trustee sales, where an executor needs a demonstrably transparent process and a defined end date.
- Genuine scarcity, where a street or a property type rarely trades and there is a known pool of waiting buyers.
Situations where private treaty is usually the better fit:
- A standard family home in a suburb with plenty of recent comparable sales. The evidence already tells you the price.
- A market with heavy competing supply, which is where Perth sits this spring.
- Where the buyer pool needs finance. Most owner-occupiers do, and an auction excludes conditional offers entirely.
- Where you need flexibility on settlement timing, for instance because you are buying as well as selling.
What does each method cost the seller?
The underlying costs are the same, with auction adding the auctioneer’s fee and usually a more compressed, more intensive marketing spend. Neither method changes agent commission, settlement agent fees or transfer costs by itself.
What does differ is where the risk sits. A private treaty campaign can be adjusted as it runs. An auction concentrates the marketing budget into a short campaign with a fixed end date, and if the property is passed in that spend has already been made. Our guide to the costs of selling a house in WA breaks down the full seller cost list that applies under either method.
Ask for the proposed cost of any campaign in writing before you commit, itemised, including what happens to the marketing spend if the property does not sell.
How does the method of sale change what a buyer can do?
It changes almost everything about how a buyer approaches your property, which is why the choice is really a decision about who you want to attract.
| Buyer situation | Private treaty | Auction |
|---|---|---|
| Needs finance approval | Can offer subject to finance | Effectively excluded unless already unconditionally approved |
| Wants a building or pest inspection | Can make it a condition of the offer | Must inspect and pay for reports before auction day, with no guarantee of success |
| Needs to sell their own home first | Can negotiate a condition | Cannot |
| Wants a specific settlement date | Negotiable as a term | Fixed in the conditions of sale |
| Is buying with cash | Competes on equal terms | Holds a clear advantage |
Note one thing sellers often overlook: WA has no mandatory seller disclosure statement, and the agent must disclose relevant facts about the property, particularly when directly asked. That obligation applies under both methods. Our guide to what Perth property sellers should disclose covers where the line sits.
Frequently asked questions
Is auction or private treaty better in Perth?
Private treaty suits the large majority of Perth homes, because the market is well supplied with comparable evidence and most buyers need finance. Auction suits properties that are genuinely hard to price and likely to draw several unconditional buyers.
Can a buyer make an auction bid subject to finance?
No. Consumer Protection WA states that auction purchases cannot be conditional on financing approval, which is why buyers are told to arrange pre-approved finance and nominate a settlement agent before auction day.
What happens if a property is passed in at auction?
The property has not reached its reserve and does not sell under the hammer. The auctioneer or agent may then negotiate privately with bidders, and the property can continue to be marketed.
Is there a cooling-off period for property in WA?
No. There is no mandatory cooling-off period for real estate contracts made in Western Australia under either method of sale, which is why getting advice before signing matters so much here.
Does the seller have to accept the highest offer in a private treaty sale?
No. The seller is free to accept or decline any offer regardless of the order in which offers were received, and price is only one of the terms being compared. Deposit, settlement date and conditions all count.
Can the reserve price be changed on auction day?
The reserve is the seller’s minimum and it is set privately rather than disclosed to bidders. Discuss with your agent and auctioneer how and when it is confirmed, and what happens if bidding stops below it.
Decide the method before you decide the price
Method of sale, price strategy and campaign length are one decision, not three. The right answer depends on your property, your timing and the buyers currently active in your suburb, and this spring that last factor is doing more work than usual.
Talk it through before you commit to a campaign. See how a Perth sale is run end to end, or read about residential sales across South Perth, Como, Applecross and Perth’s riverside south.
Call Brian on 0418 896 354 or email brianmcallister@theagency.com.au. Seven days, by appointment.
This article is general information for Western Australia and is not legal or financial advice. Contract terms, auction conditions and disclosure obligations vary by transaction. Obtain advice from your licensed settlement agent or lawyer before signing anything.