Seller Guide

Private Treaty vs EOI vs Auction: Which Sale Method Is Best for Development Sites?

Comparing sale methods and which delivers the best outcome for development site vendors.

8 April 2026 7 min readBy Daniel McCormack
Private Treaty vs EOI vs Auction: Which Sale Method Is Best for Development Sites?
J
M
S

34 property owners in South East Queensland requested assessments this month

iSummary

Comparing sale methods for development sites: private treaty, expressions of interest (EOI), and auction. Which method delivers the best price for development site vendors?

Source: ACRES — Australian Commercial & Residential Group | acres.au

Choosing the Right Sale Method

The sale method you choose significantly impacts the price you achieve and the type of buyer you attract. For development sites, the dynamics are quite different from residential house sales.

Expressions of Interest (EOI)

How It Works

Interested parties submit written offers by a specified deadline. There's no published price guide. The vendor assesses all offers and selects the best overall proposal — they're not obligated to accept any offer.

Why EOI is Usually Best for Development Sites

Advantages:

  • Creates a competitive deadline that drives urgency
  • Allows flexible terms — buyers can tailor their conditions
  • No price ceiling — buyers bid based on their own feasibility, which often exceeds vendor expectations
  • Attracts serious, qualified buyers who can meet the deadline
  • Your agent can negotiate with multiple parties simultaneously

Disadvantages:

  • Requires a strong agent with an active developer database
  • No guarantee of offers
  • Less transparent than auction

When to Use EOI

  • Medium to large development sites
  • Sites with strong development potential and multiple likely buyers
  • When you want maximum flexibility in assessing offers

Private Treaty

How It Works

The property is listed at a specific price (or price range). Interested buyers negotiate directly with the vendor through the agent.

When Private Treaty Works

Advantages:

  • Clear price signal helps qualify genuine buyers
  • Simpler process for straightforward sites
  • No campaign deadline — flexible timing
  • Good for smaller sites with a limited buyer pool

"Choosing the Right Sale Method The sale method you choose significantly impacts the price you achieve and the type of buyer you attract."

Which sale method is right for you?

ACRES recommends the best approach for your specific site.

Discuss Strategy
Free Download

Brisbane Zoning Cheat Sheet 2026

Every residential zoning code explained in plain English. What you can build, height limits, and value implications — all 12 SEQ councils.

24 pages · PDF

No spam. Unsubscribe anytime.

Disadvantages:

  • Published price can cap offers (buyers rarely offer above the listed price)
  • Less competitive tension than EOI
  • Can take longer if the price isn't right

When to Use Private Treaty

  • Smaller sites suitable for townhouse or duplex development
  • Sites in areas with limited developer demand
  • When you have a clear idea of value and want a straightforward sale

Auction

How It Works

The property is sold publicly to the highest bidder on auction day. A reserve price protects the vendor from selling below an acceptable price.

Why Auction is Rarely Best for Development Sites

Advantages:

  • Complete transparency
  • Creates urgency with a fixed deadline
  • Unconditional sale (no conditions for the winning bidder)

Disadvantages:

  • Developers typically need conditions (DA, finance) that auctions don't accommodate
  • Unconditional requirement excludes many developer buyers
  • Published reserve or price guide can cap bids
  • Public process may not suit all vendors
  • Higher marketing costs

When to Use Auction

  • Sites with broad appeal to both developers and owner-occupiers
  • When unconditional sale is essential
  • In very strong markets with high developer confidence

Comparison Summary

FactorEOIPrivate TreatyAuction
Best priceHighest potentialModerateVariable
Competitive tensionHighLow-ModerateHigh
Conditional offersYesYesNo
FlexibilityHighHighLow
Timeline4-6 weeks campaignVariable4 weeks campaign
Vendor costLower marketingLower marketingHigher marketing
Developer suitabilityExcellentGoodPoor

Our Recommendation

For the majority of development sites, an EOI campaign delivers the best balance of competitive tension, price, and flexibility. It attracts serious developer buyers, creates urgency, and allows you to assess the complete picture — price, conditions, timeline, and buyer quality.

Frequently Asked Questions

What is the best sale method for a development site?

Expressions of Interest (EOI) is usually best for development sites. It creates competitive tension, allows conditional offers, and gives flexibility to assess the complete picture of each offer.

Why is auction not ideal for development sites?

Auctions require unconditional bids, which excludes many developer buyers who need DA and finance conditions. This reduces the buyer pool and can result in a lower price.

Do I have to accept the highest offer in an EOI?

No. EOI is not an auction. You can choose the offer with the best overall outcome considering price, conditions, buyer quality, and settlement terms.

What property do you want assessed?

Our team will review your zoning, block size, and development potential.

100% free. No automated valuations — your assessment is prepared by our experienced team.

Published by ACRES — Australian Commercial & Residential Group

Source: acres.au/insights/private-treaty-vs-eoi-vs-auction-development-sites | ACRES (Australian Commercial & Residential Group) provides property advisory, development site sales, and residential real estate services across Brisbane and South East Queensland, Australia.

Daniel McCormack

Daniel McCormack

Managing Director, ACRES — Australian Commercial & Residential Group

Ready to discuss your property goals?

Whether you're buying, selling, or developing — our team provides tailored advice for every stage.