SDA vs SIL: What's the Difference?
These two acronyms get mixed up constantly. SDA and SIL are both funded through the NDIS, both relate to housing and daily living, and both often apply to the same person. But they cover completely different things. Getting the distinction right matters — for participants choosing their living arrangements, and for anyone investing in or providing disability housing.
What is SDA?
Specialist Disability Accommodation is specialised housing with accessible features for people with extreme functional impairment or very high support needs. The funding covers the cost of the dwelling itself — the bricks and mortar, the accessible design features, the physical building.
SDA funding is paid to the SDA housing provider — the organisation that owns and manages the property. It is not paid to support workers or care staff. Only approximately 6% of NDIS participants are eligible for SDA. For a full breakdown, read our guide on what SDA is and how it works.
What is SIL?
Supported Independent Living is help or supervision with daily tasks in your home to help you live as independently as possible while building your skills. SIL covers paid personal supports — help with personal care tasks, cooking meals, and daily living assistance. It is a support service, delivered by people.
SIL funding goes to the SIL service provider — the organisation employing the disability support workers who deliver the hands-on care. Eligibility for SIL is broader than SDA. Many participants receive SIL while living in standard rental housing, family homes, or shared accommodation that is not SDA.
From 1 July 2026, mandatory registration for SIL providers is being introduced, which will bring additional quality and safety standards to the sector.
The core difference
Put simply: SDA is the house. SIL is the help you get inside it. SDA is property-based. SIL is people-based. One pays for walls and ramps and ceiling hoists. The other pays for the support worker who helps you get dressed in the morning.
SDA vs SIL at a glance
| SDA | SIL | |
|---|---|---|
| Full name | Specialist Disability Accommodation | Supported Independent Living |
| What it covers | The dwelling/building | Paid personal supports — personal care, cooking, daily living assistance |
| Nature | Housing (property-based) | Support service (people-based) |
| Funding goes to | The SDA housing provider | The SIL service provider (disability support workers) |
| Eligibility | ~6% of NDIS participants | Broader than SDA |
| Definition | Specialised housing with accessible features for people with extreme functional impairment or very high support needs | Help or supervision with daily tasks to live as independently as possible while building skills |
How SDA and SIL interact
SDA and SIL can be provided in the same dwelling. A participant might live in an SDA property and receive SIL supports there every day. But the two funding streams are separate, the service agreements must be separate, and ideally the providers should be different organisations.
This separation exists to increase participant choice and control. If your housing provider is also your support provider, changing one means changing both. Participants should be able to switch their support workers without having to move house, and move house without losing their support team.
Common misconceptions
“SDA includes support workers”
No. SDA is not a support service — it is housing. The funding pays for the building and its accessible features. Support staff are funded through SIL or other NDIS support categories.
“If I get SDA funding, I automatically get SIL too”
Having SDA funding does not automatically include SIL, and vice versa. They are assessed and funded separately. You may have one without the other.
“Most NDIS participants need SDA”
Only about 6% of NDIS participants are eligible for SDA. The vast majority of participants live in mainstream housing, sometimes with SIL or other home-based supports.
Why separation of SDA and SIL matters
The Disability Royal Commission and the NDIS Review both recommended transitioning away from arrangements where the same provider delivers both SDA and SIL to the same participant. The reason is straightforward: when one organisation controls both your housing and your daily support, a conflict of interest and power imbalance arises.
The scale of the issue is significant. A very significant proportion of SIL providers also provide Support Coordination and SDA, creating layered conflicts. A provider that manages your housing, delivers your personal care, and coordinates your NDIS plan has substantial influence over your choices. That is the opposite of what the NDIS was designed to deliver.
The Australian Government has committed $49.7 million for targeted compliance and conflict of interest education. The NDIS Commission has also completed broad community consultation on SIL Practice Standards and separation options. These are not theoretical discussions — regulatory change is actively underway.
For deeper context on how these conflicts affect market data and investment decisions, see our piece on why independent SDA data matters.
What this means for investors
If you are investing in SDA, the direction of travel is clear: the regulatory environment is moving toward separation. Providers that bundle SDA and SIL may face restrictions in future. Dwellings that are structured to give participants genuine choice of support provider will be better positioned.
Understanding the distinction between SDA and SIL is also fundamental to reading SDA market demand data correctly. SDA demand figures reflect housing need — they do not tell you anything about support worker availability or SIL capacity in a given area.
Frequently asked questions
Can the same provider deliver both SDA and SIL?
Currently yes, but service agreements must be separate. The Disability Royal Commission recommended moving toward full separation. The Australian Government has committed $49.7 million to address conflicts of interest in this area.
Do I need both SDA and SIL?
Not necessarily. They are separate supports. You may have SDA funding without SIL, or SIL without SDA. Many SIL recipients live in standard housing.
Who decides whether I get SDA or SIL?
The NDIS makes funding decisions based on your individual needs, support requirements, and evidence provided (such as occupational therapy assessments). Your support coordinator can help you apply for either or both.
Sources: NDIS — Specialist Disability Accommodation, NDIS — Supported Independent Living, National Disability Services (NDS)
Understand the SDA market with independent data
SDA Signals maps supply, demand, and undersupply across every region in Australia — built from official NDIS data, with no conflicts of interest.