Understanding SDA Demand: How to Read NDIS Market Data

How the NDIS Publishes SDA Data

The NDIS releases quarterly reports covering SDA supply, demand, and participant data. These typically land in March, June, September, and December, though exact timing is set by the NDIS and can vary.

Each report includes participant numbers, dwelling counts, places, and design category breakdowns. Critically, the data is published at the SA3 regional level — more on what that means below.

The primary source is the NDIS data portal, along with the quarterly reports published on the NDIS website. The reports are publicly available — anyone can download them. The challenge is not access; it is interpretation.

Key SDA Metrics Explained

The NDIS reports contain several interconnected metrics. Here is what each one actually tells you.

National SDA Market Snapshot (March 2025)

The March 2025 quarterly data paints a picture of a market still growing rapidly, but unevenly.

Category-level growth has been uneven. High Physical Support (HPS) dwellings grew 49% over two years, adding 1,645 new dwellings. Robust grew 63% over the same period, with 549 new dwellings. These two categories have attracted the most new investment — and in some regions, that concentration is starting to create oversupply concerns.

For more on why category-level analysis matters, see our SDA design categories guide.

Why Regional Data Matters More Than National Averages

National figures are useful for understanding the broad trajectory of the SDA market. They are nearly useless for making actual investment decisions.

Regional variations are extreme. Some SA3 areas have more enrolled dwellings than funded participants — genuine oversupply. Others have strong participant demand and almost no new supply in the pipeline. A national average of 21% dwelling growth tells you nothing about whether a specific suburb in western Sydney or regional Queensland is undersupplied or saturated.

SDA investment decisions are long-term. Build cycles run 12 to 24 months. By the time a dwelling is completed and enrolled, the supply-demand picture in that region may have shifted. This is why understanding structural trends — not just single-quarter snapshots — is so valuable.

For a deeper look at why data source independence matters when assessing these regional dynamics, read our piece on why independent SDA data matters.

NDIA Long-Term Demand Projections

The NDIA has published its own demand projections for SDA out to 2042. These are based on a June 2022 baseline and project forward using demographic modelling and scheme maturation assumptions.

Queensland and Western Australia are projected to grow fastest. But projections are just that — projections. They assume current policy settings remain broadly stable and that scheme growth continues along modelled trajectories. Recent government commentary about NDIS cost sustainability means these projections carry genuine uncertainty.

A 2.4% average annual growth rate in participant numbers, combined with current dwelling supply growth of 21% per year, tells a clear story: supply is growing far faster than demand at the national level. The investment opportunity — where it exists — is regional and category-specific, not broad-based. For more on how to think about these risks, see our SDA investment risks guide.

What Is an SA3 Region?

SA3 stands for Statistical Area Level 3, a geographic classification maintained by the Australian Bureau of Statistics. Australia has over 340 SA3 regions, each covering a functional area that typically includes a mix of suburbs or towns.

The NDIS reports SDA data at the SA3 level. This is granular enough to reveal meaningful local patterns but broad enough that individual dwellings are not identifiable. For investors, SA3 is the right unit of analysis — it matches the geographic scale at which supply and demand dynamics actually play out.

Frequently Asked Questions