Auction vs Private Treaty
A side-by-side comparison from an agent with 700+ sales and 25+ years in the St George market — so you can choose the method that gets the best result for your property.
By Michael Kalinovski · Updated August 2026 · 10 min read
The short answer
In Sydney's 2026 market, auction suits properties with broad buyer appeal and strong comparable sales — it creates competitive tension that often pushes the price above expectations. Private treaty suits unique properties, niche markets, or vendors who need flexibility on settlement. Neither method is inherently "better" — the right choice depends on your property type, the local buyer pool, and your personal circumstances. An experienced agent will recommend the method that attracts the most genuine competition for your specific home.
Side-by-Side Comparison
How the two methods differ on the things that actually matter to vendors.
How the price is set
Buyers compete openly on the day — the market sets the price in real time. A reserve protects you from selling below your minimum.
You set an asking price (or price guide) and negotiate with each buyer individually. Offers can come in above or below the guide.
Timeline
Typically a 3–4 week campaign to auction day. If it passes in, negotiation continues immediately. Most properties sell on the day or within days.
No fixed deadline — the property stays on the market until you accept an offer. Can be days or months depending on pricing and demand.
Buyer psychology
Creates urgency and FOMO — buyers must be ready with finance, building inspection and strata report before auction day. Competition is visible and emotional.
Buyers can take their time, compare alternatives, and negotiate without pressure. May attract conditional buyers (subject to finance, subject to sale).
Price certainty
Uncertain until the hammer falls — could exceed expectations or pass in below reserve. The range of outcomes is wider.
More predictable — you set the asking price and negotiate from there. But you may leave money on the table if multiple buyers would have competed.
Cooling-off period
None. The contract is unconditional and binding when the hammer falls (or if a buyer signs the auction contract pre- or post-auction). Deposit is paid immediately.
Buyer has a 5 business-day cooling-off period under NSW law (can be waived via a 66W certificate from the buyer's solicitor). Fall-throughs are possible.
Vendor marketing cost
Campaign costs are typically the same as private treaty — the difference is the method, not the spend. Auctioneer fees (if separate) are usually $500–$1,000.
Same marketing costs apply. Some vendors assume private treaty is "cheaper" — in practice the total cost depends on campaign length, not method.
Transparency
Fully transparent — every bidder sees every bid. The vendor and agent cannot fabricate competing offers.
Less transparent — buyers don't see other offers. They must trust the agent when told there's another interested party.
Which Method Suits Your Property?
Use these as a starting point — the right call depends on your specific property and circumstances.
Choose auction if…
- Your property is a standard house, unit or townhouse that appeals to a broad buyer pool
- There are strong comparable sales to anchor buyer expectations
- The local market is competitive with low stock — scarcity drives auction energy
- You want a defined campaign window and a firm end date
- You prefer price transparency — every bid is visible, no behind-the-scenes negotiation
- You want an unconditional, no-cooling-off sale on the day
Choose private treaty if…
- Your property is unique, high-end, or appeals to a very specific buyer (e.g. development sites, heritage homes)
- Comparable sales are limited or hard to interpret — buyers need guidance on value
- The market is slow, stock is high, or buyer confidence is soft
- You need flexibility on settlement timing or want to negotiate special conditions
- Your buyer pool is likely to include conditional purchasers (subject to finance or sale of their own property)
- You're not comfortable with the public nature of an auction
What This Looks Like in St George
National auction statistics are misleading — the method that works in Melbourne\'s inner east is not necessarily right for Rockdale or Sans Souci. Here\'s how the two methods play out locally.
Auction demand remains strong
In the St George region — particularly the 2216, 2217 and 2219 postcodes — well-priced family homes continue to attract strong auction competition, driven by a persistent undersupply of quality family homes relative to buyer demand.
Private treaty dominates for units
While houses in suburbs like Rockdale, Brighton-Le-Sands and Sans Souci tend to suit auction campaigns, the apartment-heavy pockets of Arncliffe, Wolli Creek and Kogarah often see private treaty perform better — the buyer pool includes more investors and first-home buyers who are rate-sensitive and need finance approval timelines.
Hybrid campaigns are common
Many St George campaigns start as "auction unless sold prior". This gives the vendor the marketing urgency of an auction timeline while leaving the door open for a strong early offer. In my experience, roughly 30% of properties listed for auction sell before auction day via this approach.
Common Myths — Busted
Myth: “Auctions are only for expensive properties”
Auction works for any property with broad appeal — a $700K unit in Arncliffe benefits from competitive tension just as much as a $2M house in Sans Souci. The method is about buyer competition, not price point.
Myth: “Private treaty always gets a higher price because you can hold out”
Holding out can also mean your listing goes stale. Properties that sit on the market for weeks lose urgency and often sell for less than a well-run 4-week auction campaign would have achieved.
Myth: “You have to sell at auction even if you don't like the bids”
You are not obligated to sell. The reserve is your minimum — if bidding doesn't reach it, the property passes in and you negotiate privately with the highest bidder (who has already shown their hand).
Myth: “Buyers don't like auctions”
Many buyers actually prefer auctions because the process is transparent. They can see what they're bidding against, unlike private treaty where they're trusting the agent's word on competing interest.
Frequently Asked Questions
Practical answers to the questions I hear most from vendors deciding between auction and private treaty.
What is the difference between auction and private treaty?+
At auction, buyers compete by openly bidding against each other on a set date — the highest bid above the reserve wins, the contract is unconditional, and there is no cooling-off period. With private treaty, the vendor sets an asking price and negotiates with individual buyers privately; the buyer gets a 5 business-day cooling-off period under NSW law unless they waive it via a 66W certificate.
Which method gets a higher price in Sydney?+
Neither method inherently achieves a higher price. Auction tends to outperform when there is genuine competition — two or more motivated buyers pushing each other above expectations. Private treaty can outperform when the property is unique and a single committed buyer is willing to pay a premium to secure it without public competition. The right method depends on your property type, the buyer pool, and market conditions.
What happens if my property passes in at auction?+
If bidding does not reach your reserve, the property passes in and is not sold. The highest bidder has the first right to negotiate with you after the auction. Many properties that pass in sell within hours or days because the bidder has already publicly committed to a price close to your reserve, giving you a strong negotiating position.
Do I have to pay for an auctioneer on top of agent commission?+
Some agencies include the auctioneer in their commission; others charge a separate auctioneer fee of $500 to $1,000. This should be clearly disclosed in the agency agreement before you sign. At Century 21, the auctioneer fee is covered as part of the service — always ask your agent to confirm before you commit.
Can I switch from auction to private treaty (or vice versa)?+
Yes. Your agent can recommend switching methods at any point during the campaign. For example, if an auction campaign is not generating enough interest, converting to private treaty with a clear asking price can re-engage buyers who were sitting on the sideline. The reverse is also possible — if open-home numbers are strong, you may decide to bring forward an auction date.
What does "auction unless sold prior" mean?+
It means the property is being marketed toward an auction date, but the vendor is open to accepting a strong offer before auction day. This is the most common hybrid approach in Sydney — it gives the vendor the urgency and structure of an auction campaign while keeping the door open for early offers. If no prior sale occurs, the auction proceeds as scheduled.
Is the vendor's reserve price made public?+
No. The reserve is confidential between the vendor and the auctioneer. It is the minimum price at which the vendor has authorised the auctioneer to sell. Bidders do not know the reserve, but the auctioneer will announce when bidding has reached the reserve ("the property is on the market"), signalling that the next bid wins.
How long does a private treaty sale take compared to auction?+
An auction campaign is typically 3 to 4 weeks from listing to auction day, with most properties selling on the day or shortly after. Private treaty has no fixed timeline — it depends on how accurately the property is priced and how much demand exists. A well-priced private treaty in an active market can sell in under a week; an overpriced one can sit for months.
Related Guides & Tools
Questions to Ask Your Agent
50 questions to ask before signing — including how to probe their recommendation on selling method.
OpenAuction Agent — St George
25+ years of auction expertise. See how I run auction campaigns in the St George region.
OpenSelling Costs Calculator
Estimate your total selling costs — commission, marketing, legal, and more — for both auction and private treaty.
OpenFree Property Appraisal
Not sure which method suits your home? Book a free appraisal and I'll recommend the strongest approach for your property.
OpenNot sure which method suits your home?
I\'ll give you an honest recommendation based on your property, your suburb, and the current buyer pool — not a one-size-fits-all formula. Book a free appraisal and I\'ll walk you through both options with real comparable sales.
General information only, current for New South Wales at the time of writing. This guide does not constitute legal or financial advice. Always seek independent legal advice before signing an agency agreement or auction contract.