What Vacancy Rate actually measures
Vacancy Rate is the percentage of rental properties in a suburb that are available for lease but unoccupied on a given date. It’s usually measured monthly by data providers like SQM Research or CoreLogic.
If a suburb has 500 rental properties and 10 are sitting empty, the vacancy rate is 2.0%.
The bands that matter
For Australian capital city suburbs:
- Under 1.0% — severe undersupply. Extreme rent growth pressure. Tenants compete, queue, and offer above asking. Often precedes 15–25% annual rent rises.
- 1.0–2.0% — tight. Landlords have strong pricing power. Typical yield-favourable market.
- 2.0–3.0% — balanced. Healthy functioning market. Neither side has strong leverage.
- 3.0–4.5% — soft. Tenants have options, landlords compete on price, rents flat or falling.
- Above 4.5% — oversupplied. Rent concessions common. Landlords facing genuine vacancy risk.
Perth in early 2026 has been sitting at 0.8–1.3% across most suburbs — extremely tight, and driving the rental yield story that’s attracting east coast investors.
Why vacancy leads rent growth
Vacancy doesn’t cause rent growth directly — it’s a signal that undersupply exists. But the relationship is strong enough that vacancy rate is often the best predictor of future rent increases.
The typical sequence:
- Population growth or demand shift pushes tenants into a suburb
- Vacancy drops as existing stock absorbs demand
- Rents begin rising as landlords test the market
- Higher rents attract new investors, eventually driving construction
- New supply absorbs tenants, vacancy normalises, rent growth moderates
If you can buy during step 2 (vacancy dropping, rents not yet rising), you catch the upswing. By step 4 everyone can see the story and prices have priced it in.
What vacancy can’t tell you
Vacancy is a present snapshot. It doesn’t tell you:
- Why vacancy is tight (population influx vs stock withdrawal vs temporary)
- How long it will stay tight (depends on approvals pipeline)
- Tenant quality (a suburb can have 0.5% vacancy but high turnover and rent arrears)
Pair vacancy with SEIFA, household income trends, and new dwelling approvals to see the full picture.
Why Perth’s sub-1% vacancy is structural, not temporary
Perth’s vacancy crisis has specific drivers:
- Strong interstate migration (14,800/yr net to WA)
- Limited new construction through 2020–2023
- Surging demand from mining sector workers
- Investor activity removing stock from the rental pool
Unwinding any of these takes years, not months. Investors watching Perth are effectively betting that vacancy stays below 2% for several more years — which seems well-supported by current data.