34 property owners in South East Queensland requested assessments this month
iSummary
How selling your property together with your neighbour increases the total price. Real Brisbane examples, the amalgamation premium explained, and how to split the proceeds fairly.
Source: ACRES — Australian Commercial & Residential Group | acres.au
The Maths Behind Joint Sales
When two adjacent property owners sell together, the combined site is worth more than the sum of its parts. This is not theory — it is a consistent market reality driven by development economics.
Why Bigger Sites Command Premiums
More Efficient Development
A developer building on a 1,400m² combined site achieves:
- Better building layout — more design flexibility
- Shared infrastructure — one driveway, one stormwater system, one set of connections
- Higher density — may cross a threshold that permits additional dwellings
- Lower per-unit costs — fixed costs spread over more dwellings
Crossing Development Thresholds
Many development types have practical minimum site sizes:
| Development Type | Practical Minimum | Typical Yield |
|---|---|---|
| Duplex | 500m² | 2 dwellings |
| Triplex | 700m² | 3 dwellings |
| 4-pack townhouse | 900m² | 4 dwellings |
| 6-pack townhouse | 1,200m² | 6 dwellings |
| Small apartment (8-12 units) | 1,500m² | 8-12 dwellings |
If your block is 700m² and your neighbour's is 650m², individually each can support a duplex or triplex. Combined (1,350m²), the site supports 5-6 townhouses — a fundamentally different (and more valuable) proposition.
Real Brisbane Examples
"This is not theory — it is a consistent market reality driven by development economics."
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Kedron — Two 650m² Blocks
- Individual values: $680,000 + $695,000 = $1,375,000
- Combined sale to developer: $1,650,000
- Premium captured: $275,000 (20%)
- Each owner received approximately $137,500 more than selling alone
Mount Gravatt — Two 750m² Blocks
- Individual values: $780,000 + $800,000 = $1,580,000
- Combined sale to developer: $1,920,000
- Premium captured: $340,000 (22%)
Coorparoo — Three Adjacent 600m² Blocks
- Individual values: $750,000 x 3 = $2,250,000
- Combined sale (1,800m²): $2,925,000
- Premium captured: $675,000 (30%)
- Note: Three-block consolidations command even higher premiums
How to Approach the Conversation
Signs Your Neighbour Might Be Interested
- They are retired or downsizing
- The house is a rental (investor owner)
- They have mentioned moving
- Property maintenance is declining
- They have received developer letters
The Conversation Script
"I have been thinking about the value of our blocks and did some research. It turns out that if we were both interested in selling, the combined site could be worth significantly more to a developer than selling separately. Would you be open to getting a joint appraisal? No commitment — just to understand the numbers."
If They Say No
- Respect their decision completely
- Leave the door open for the future
- You can still sell your block individually — it may be worth more to a developer who then approaches your neighbour
Getting the Numbers Right
Before having the conversation, get informed:
- Check your zoning on council's mapping tool
- Estimate individual block values using our free valuation tool
- Consider what could be built on the combined site
- Contact ACRES for a confidential combined-site assessment
We provide these assessments at no cost. If the numbers make sense, we can help facilitate the conversation and manage the sale process.
Frequently Asked Questions
Is it common for neighbours to sell together?
It is increasingly common in Brisbane as developers seek larger sites. We facilitate multiple joint sales per year. The key success factor is having an independent agent who can represent both parties fairly.
What if one neighbour wants more money than the other?
Price allocation should be based on objective criteria — individual property values, block sizes, and proportional share of the premium. An independent appraisal by a qualified agent provides the fair basis for negotiation.
Can more than two neighbours sell together?
Yes, and three or four-property consolidations command the highest premiums (25-40%). However, coordination complexity increases significantly. Having a skilled agent manage the multi-party process is essential.
What property do you want assessed?
Our team will review your zoning, block size, and development potential.
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Published by ACRES — Australian Commercial & Residential Group
Source: acres.au/insights/selling-together-neighbour-higher-price | 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
Managing Director, ACRES — Australian Commercial & Residential Group
