iKey Facts
- •South-East Queensland forecast to absorb 1.5 million additional residents by 2046 — largest absolute capital growth in Australia
- •New dwelling demand of ~30,000-40,000 dwellings per year through 2030, against current delivery of ~22,000-28,000
- •Net interstate migration to Queensland sustained above 30,000/year through 2022-2025 — historical highs
- •Population-driven demand is the most reliable structural force supporting Brisbane site values for the decade
- •See companion article: Why Brisbane Is Entering a Generational Property Cycle
The Numbers
Queensland State Government and ABS projections:
- South-East Queensland population growth 2025-2046: ~1.5 million additional residents
- Brisbane City annual population growth: 1.6-2.0% (Australia's fastest among capital cities)
- Net interstate migration to Queensland: 30,000+/year sustained through 2022-2025
For context: 1.5 million additional people is roughly the size of Adelaide moving into the SEQ region over 20 years. That's a structural demand event without recent precedent in Australian property history.
Translating Population to Housing Demand
Population growth becomes housing demand via:
Annual new dwelling demand = (population growth ÷ household size) + replacement demand + investment / second-home demand
For SEQ:
| Input | Value |
|---|---|
| Annual population growth | ~80,000 |
| Average household size | ~2.5 |
| New dwellings from organic growth | ~32,000 |
| Replacement demand (demolition / obsolescence) | ~3,000 |
| Investment / second-home demand | ~5,000 |
| Total annual SEQ new dwelling demand | ~40,000 |
Current SEQ new dwelling delivery is running ~22,000-28,000 per year — a structural undersupply of ~12,000-18,000 dwellings annually. That gap is now ~3-5 years deep cumulatively.
What the Supply Gap Means
When demand exceeds supply by 30-50% for several consecutive years:
- Prices rise (property prices, rents)
- Vacancy compresses (Brisbane vacancy at 0.8-1.2% through 2024)
- Rent growth accelerates (Brisbane rents up 25-40% since 2020)
- Development site values rise (developers compete for limited buildable land)
This is the mechanism by which population growth flows through to development site values.
Why The Supply Gap Persists
Three forces have constrained Brisbane housing supply through 2020-2025:
"Inner-Brisbane suburbs have lower percentage growth but tightest existing supply."
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1. Construction Cost Inflation
35-45% increase since 2020 (see How Construction Costs Affect Site Pricing). Many feasibilities that worked at 2020 cost lines no longer pencil.
2. Council Approval Timeframes
Materially extended through 2022-2025. Code-assessable applications routinely take 18-26 weeks; impact-assessable applications 9-15 months.
3. Construction Sector Capacity
Builder insolvencies and trade shortages have reduced the deliverable pipeline. Supply infrastructure is rebuilding but slowly.
The supply gap is structural and will not close meaningfully before 2027-2028 at earliest.
What This Means for Development Site Demand
Sustained 30-50% supply-demand gap means:
- Developers actively bidding for any site that pencils at current cost lines
- Strategic premium persisting on well-located sites
- Long-dated optionality value in sites with rezoning, infrastructure, or amalgamation pathways
- Capital flowing to Brisbane at a pace exceeding any peer market in Australia
For landowners, this means:
- Strong pricing today, with upside through the decade
- Multi-developer competitive tension on quality sites
- Strategic structures (long settlement, options) capture additional upside
- Time on market is short for well-positioned sites
Population-Driven Suburban Variance
Population growth is concentrated, not evenly spread. Suburb-level variance:
| SEQ Region | Annual Population Growth |
|---|---|
| Brisbane City — inner ring | 1.5-2.0% |
| Brisbane City — middle ring | 1.0-1.5% |
| Logan | 2.5-3.5% |
| Ipswich | 3.0-4.0% |
| Moreton Bay | 2.0-2.5% |
| Gold Coast | 2.0-2.5% |
| Sunshine Coast | 2.5-3.0% |
The fastest-growing markets often have the largest supply-demand gaps and strongest development site demand. Inner-Brisbane suburbs grow more slowly in absolute population but face the tightest existing supply.
When Population Growth Slows
The risk to the structural-demand thesis is a sudden population slowdown — driven by:
- National migration policy changes (overseas migration is a meaningful component of SEQ growth)
- Interstate migration reversal (if Sydney/Melbourne lifestyle improves materially)
- Economic shock (recession reducing inward migration)
Each is possible but not in the base case. Even at materially slower growth (say 50% reduction in net inward migration), SEQ would still have a structural supply gap given current delivery rates.
Frequently Asked Questions
Will the supply-demand gap close?
Yes — eventually. Base case: gap starts narrowing 2027-2028, closes 2030+. Modest supply pressure likely persists into 2035.
Do all SEQ suburbs benefit equally?
No — concentration matters. Inner Brisbane has lowest % growth but tightest supply. Logan/Ipswich/Moreton Bay grow fastest with more deliverable land.
How does population growth drive site pricing specifically?
Through the GRV input in feasibility. Growing population supports rising apartment prices and rents, which raises GRV, which raises RLV.
Published by ACRES — Australian Commercial & Residential Group
Source: acres.au/insights/how-population-growth-drives-development-site-demand | 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
