Vacancy rate is the single most important number in SDA investment due diligence — and it is also the number most investors never look up before committing capital. This guide explains how SDA vacancy rates work, what the current data shows at a state and suburb level, and what a high or rising vacancy rate means for an investor's tenanting timeline and return projections.
What Is an SDA Vacancy Rate?
An SDA vacancy rate measures the proportion of registered, tenantable SDA dwellings in a given area that are currently unoccupied. A vacancy rate of 10% means one in ten SDA homes in that area has no tenant. Unlike standard residential vacancies — where a home can be re-let to any renter — a vacant SDA property can only be occupied by an eligible NDIS participant with appropriate funding. This constraint makes SDA vacancy far more consequential than residential vacancy.
When an SDA home sits vacant, the investor receives no income. There is no fallback tenant pool. The property cannot be converted to standard residential tenancy without losing its SDA registration and all associated government payments. The exit options from a vacant SDA investment are limited and costly.
Key fact: As of March 2026, over 1,000 SDA properties across Australia are sitting vacant — approximately 8–10% of all registered SDA dwellings nationally. This figure varies sharply by state and suburb.
National Vacancy Rate — Current State
The national SDA vacancy rate has been relatively stable in the 8–12% range since 2023, but this aggregate figure conceals dramatic variation at the state and suburb level. A national rate of 10% does not mean every suburb has a 10% vacancy rate — some suburbs have rates below 2%, while others exceed 25%.
The NDIS publishes quarterly SDA data including tenanting rates, but this data is aggregated at the SA2 or LGA level and requires analysis to convert into actionable suburb-level signals. Our Suburb Reports include the current vacancy trend for each tracked suburb, not just the point-in-time figure.
State-by-State Vacancy Snapshot (Q1 2026)
Vacancy rates vary significantly by state, reflecting differences in how quickly each market has been developed relative to its participant base.
| State | Approx. Vacancy Rate | Trend | Key Driver |
|---|---|---|---|
| New South Wales | 7–9% | ↓ Improving | High participant density, controlled pipeline |
| Victoria | 7–10% | ↔ Stable | Mixed — inner suburbs tight, outer suburbs loose |
| Queensland | 12–20% | ↑ Worsening | Developer concentration in SEQ corridors |
| Western Australia | 10–14% | ↓ Slowly improving | Early oversupply tightening |
| South Australia | 13–17% | ↑ Worsening | Supply outpaced local demand |
| Tasmania | 5–8% | ↔ Stable | Limited supply, declining participant numbers |
Why Suburb-Level Vacancy Data Matters More Than State Averages
A vacancy rate of 12% statewide in Queensland does not mean every Queensland suburb has a vacancy problem. Our tracking data shows that Townsville and Cairns have vacancy rates well below the state average, while Logan Central, Ipswich, and Springfield have rates significantly above it — in some cases approaching 25%.
The investor who relies on state-level data to make a suburb decision is making a category error. State averages obscure the suburb-level dynamics that actually determine whether a specific property will be tenanted within 3 months or 18 months.
Our Suburb Reports include: Current vacancy rate, 12-month vacancy trend, days-to-tenancy median for the catchment, and our Vacancy Risk classification (Low / Moderate / High / Critical).
Warning Signs of Rising Vacancy Risk
These indicators suggest a suburb's vacancy rate is likely to worsen over the next 12–18 months:
- Pipeline ratio above 0.5: More than one approved-but-incomplete SDA build for every two current unhoused participants.
- Declining participant approval rate: Fewer new eligibility approvals over the past 12 months, even if current demand appears positive.
- Multiple developer projects in same postcode: Combined supply will exceed local demand faster than any individual project's feasibility study assumed.
- Category mismatch: New builds targeting Improved Liveability in an area where demand is concentrated in High Physical Support.
- Extended days-to-tenancy in neighbouring suburbs: If similar suburbs nearby have long tenanting timelines, demand is not flowing across suburb boundaries as developers project.
What To Do With This Information
Before committing to any SDA investment, verify the suburb-level vacancy rate and — critically — the direction of the trend. A suburb with a current vacancy rate of 8% but a rising trend is a worse investment than one with 12% but a falling trend.
Our Suburb Reports include the current vacancy rate, 12-month trend, and a Vacancy Risk classification for every suburb we cover. The Q2 2026 Hotspot Rankings identify which suburbs have the strongest tenanting conditions right now.