SDA Investment Risks Every Investor Should Know

1. Vacancy risk — the numbers versus the assumptions

Vacancy is the single biggest risk in SDA investment, and the gap between what the NDIA assumes and what providers actually experience is striking.

The NDIA's pricing model builds in vacancy assumptions of 7.75-13%. The Housing Hub Provider Experience Survey found actual vacancy rates for new build stock sitting at 25.5% — roughly double the upper end of those assumptions.

The breakdown by dwelling type and design category makes for sobering reading:

Half of all Robust houses and group homes are sitting empty. That is not a rounding error — it is a structural mismatch between where dwellings have been built and where funded participants actually are.

The vacancy funding rules make this worse. Single-resident dwellings receive zero vacancy payment from the NDIS. For 2-3 bedroom dwellings, the maximum vacancy payment is 60 days. For 4-5 bedroom dwellings, it is 90 days. After that, income drops to nothing until a participant moves in.

How long does filling a vacancy actually take? Industry data points to 3-6 months for a single place and 6-12 months for an entire project. The Housing Hub survey found that 48.8% of providers describe locating tenants with appropriate SDA funding as "extremely challenging," and 78% of providers received lower income than they expected.

If you are modelling SDA returns using the NDIA's vacancy assumptions, you are likely overstating income. For details on how vacancy payments work within the pricing framework, see our SDA funding and price guide breakdown.

2. Regulatory risk — the rules can change

SDA pricing and regulation are set by government. That means the terms of your investment can shift with a policy decision, and they have done so before.

The 2022-23 pricing review resulted in significant restructuring of SDA price limits. While that review happened to increase payments for new builds, there is no guarantee future reviews will do the same. The NDIA can adjust pricing annually.

Several regulatory changes are already in motion:

• Legal separation of SDA and SIL: The government has committed $49.7 million to explore separating SDA housing provision from SIL support delivery. If enacted, this could reshape how SDA providers operate and how participants are matched to dwellings.
• Mandatory SIL provider registration: From 1 July 2026, all SIL providers must be registered. While this applies to SIL rather than SDA directly, the two markets are tightly linked — most SDA residents also receive SIL, and changes to SIL regulation affect the operational environment for SDA providers.
• NDIS Act amendments and practice standards: Ongoing legislative changes and new practice standards could introduce additional operational requirements for SDA providers.

None of these changes are inherently bad, but they introduce uncertainty. An investment that stacks up under current regulations may look different if the rules shift — and in this sector, they shift regularly.

3. Oversupply risk — too many dwellings, not enough participants

Oversupply of SDA rooms exists in every state and territory, with significant oversupply in some regions. The problem is not evenly distributed — regional variations are extreme. One SA3 region may be desperately undersupplied in High Physical Support apartments while the neighbouring region has more Robust group home beds than it can fill for years.

The national picture adds to the concern. Enrolled SDA dwelling stock is growing at roughly 21% per year, while demand growth sits at approximately 2.4% per annum. That arithmetic does not work forever. At some point, supply catches and then overtakes demand in category after category and region after region.

Making matters harder, the raw NDIA data — while publicly available — is released in dense quarterly spreadsheets that require significant analysis to extract regional insights. There is no visibility on what is under construction or in the planning pipeline, only what is already enrolled. And the data does not come with interpretation: it will not tell you whether a region is undersupplied in High Physical Support apartments or whether a gap is closing fast. This is where independent analysis of NDIA data adds value — turning raw quarterly releases into region-level signals that investors can actually act on. For a detailed look at current demand figures, see our SDA demand analysis.

4. Lending and finance risk — banks are pulling back

Getting finance for SDA projects has become harder. Through 2025, lenders tightened their criteria materially:

• Higher deposits: Many lenders now require 30-40% deposits for SDA projects, up from the 20% that was common a few years ago.
• No interest-only loans: Several lenders have stopped offering interest-only loan structures for SDA, which changes the cash flow profile significantly in the early years of a project.
• Postcode blacklisting: Entire postcodes have been flagged due to oversupply or high default rates. If your target location is on a blacklist, you may struggle to get finance at any terms.
• Distance limits: Lenders are applying geographic restrictions — typically 35km from metropolitan centres and 20km from regional hubs. Projects beyond these limits face refusal or significantly worse terms.

These restrictions reflect what lenders are seeing in their own portfolios. When banks tighten criteria for a specific asset class, it is usually because loss experience or risk assessment has deteriorated. That signal should not be ignored.

5. Participant matching risk — NDIA decision delays

Even when a suitable participant exists in your area, the process of getting them funded and into your dwelling is slow. NDIA decision-making timelines are a major source of friction.

The median time for an initial SDA funding decision is 71 days. If the decision goes to external review, the median blows out to 125 days (down from a previous 205 days). The total external review timeline can exceed 250 days from the initial application.

The Housing Hub survey found that 62.5% of providers view NDIA decision timeframes as "extremely challenging." During this entire period, your dwelling may be sitting empty, generating no income — and if it is a single-resident dwelling, generating no vacancy payments either.

6. Build cost risk — construction costs keep moving

SDA dwellings are not standard residential builds. They must comply with the NDIS SDA Design Standard, the National Construction Code (Building Code of Australia), and the Disability (Access to Premises — Buildings) Standards 2010 under the Disability Discrimination Act 1992.

Construction costs have been escalating across the residential sector, and specialist builds feel that pressure more acutely. The benchmark construction costs — based on reference designs by Kennedy Associates Architects for the NDIA — are reviewed and adjusted annually, but there is no guarantee that adjustments keep pace with actual cost increases on the ground.

A feasibility study done six months before construction begins may already be outdated by the time you break ground. For full details on how the NDIA sets pricing relative to build costs, read our guide to SDA funding and the NDIS price guide.

7. What the NDIA itself says about SDA investment

This matters, so read it carefully. The NDIA has published explicit warnings for SDA investors:

These are not boilerplate disclaimers buried in fine print. The NDIA has dedicated a section of its website — the Investment in SDA and Information for SDA Investors pages — specifically to push back against overstated marketing claims. If the government entity funding the scheme feels the need to warn investors publicly, that should tell you something about how SDA is being sold.

The bottom line

SDA can be a sound investment. Well-located dwellings that meet genuine demand, built by providers who understand the regulatory environment and participant matching process, can deliver strong long-term returns. But the risks outlined above are not theoretical — they are playing out right now across the sector.

Anyone considering SDA investment should go in with full visibility of the demand picture in their target region, realistic vacancy assumptions, and an understanding that the regulatory environment will keep changing. Independent data, independent legal advice, and independent financial advice are not optional extras.

Frequently asked questions