SIL vs SDA: the difference, finally explained
Understand the difference between SIL and SDA, how each is funded under the NDIS and which option may best suit your housing and support needs.
In short
- SIL = the support (the people who help you). SDA = the home (the specialist dwelling).
- They are assessed and funded completely separately.
- Many people have both — SDA for the home, SIL for the support inside it.
- SDA is only for people with extreme functional impairment or very high support needs.
- You can have SIL without SDA — most people do.
SIL and SDA are constantly tangled together, and it is easy to see why — they often appear in the same plan and go hand in hand. But they do completely different jobs, and confusing them leads to real planning mistakes: people ask for the wrong thing, or assume one includes the other. Here is the clean version.
SIL = the support
Supported Independent Living funds the people who help you live day to day — personal care, cooking, cleaning, medication prompts, skill-building and overnight support. It is about the help, not the house. SIL is funded from your Core Supports budget and built around a roster of care that reflects how much support you need, and when.
SDA = the home
Specialist Disability Accommodation funds the dwelling itself — a purpose-built or specially modified home for people with extreme functional impairment or very high support needs. Think wheelchair-accessible design, ceiling hoists, reinforced (“robust”) construction, assistive technology, or backup power for essential equipment.
SDA pays for the bricks and mortar — the specialised housing — not the people. It is funded as a capital support in your plan, and it comes with strict eligibility: it is for a relatively small group of participants whose housing needs cannot be met by ordinary homes or minor modifications.
Who qualifies for SDA
SDA has a high bar. To be eligible you generally need to show that your disability creates an extreme functional impairment or very high support needs, and that specialist housing is the most appropriate, evidence-based way to meet them. Not everyone who has SIL will qualify for SDA — in fact, most people with SIL live in ordinary rentals or shared homes, not SDA dwellings.
How they work together
Many people have both: SDA pays for the specialist home, and SIL pays for the support delivered inside it. Because they are assessed and funded separately, they need to be planned together — otherwise you can end up with a home but not enough support, or support but nowhere suitable to receive it.
This is one of the most valuable things a good provider or support coordinator does: line up housing and support so there are no gaps, and so the two actually fit. Getting an SDA home approved is a long process; arranging SIL is a different one. Running them in parallel, with someone keeping both on track, saves months of frustration.
A simple way to remember it
- If it has a heartbeat and helps you — that is SIL.
- If it has a roof and a floor plan — that is SDA.
- Need help but an ordinary home is fine? You likely need SIL, not SDA.
- Need a specialised building? That is where SDA comes in — and you will usually want SIL too.
The bottom line
SIL and SDA are not competing options — they answer two different questions: “who helps me?” and “where do I live?”. Once you separate those, housing planning gets dramatically clearer. If you are trying to work out which you need (or whether you need both), the honest answer usually comes from a proper conversation about your daily life — not a form. That is exactly what a Meet & Greet is for.
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Common questions
The simplest way to hold it: SIL is the people, SDA is the place. Supported Independent Living funds the day-to-day support workers who help you live independently. Specialist Disability Accommodation funds the purpose-built, accessible home itself — the ceiling hoists, wider doorways, reinforced walls and step-free access. They are separate NDIS budget lines with separate eligibility.
Yes, and many people do. When they are combined, SDA pays for the specialised home and SIL pays for the support inside it. But they are not a package — plenty of participants have SIL in an ordinary rental with no SDA, and it is possible to have SDA housing with only limited support.
No. SIL funds support only. If you live in SDA housing, you still make a reasonable rent contribution toward your accommodation, typically from your Disability Support Pension, in addition to the SDA payment made to the provider. Everyday living costs like food and utilities remain yours, as they would in any home.
SDA is for a small group of participants with extreme functional impairment or very high support needs, where a specially designed dwelling is what makes independent living possible. It is deliberately narrow — most participants who need help at home receive SIL or daily living supports rather than SDA.
Start with the question of what is actually not working. If the barrier is not having enough help, that points to SIL. If the barrier is the building itself — doorways you cannot get through, a bathroom you cannot use safely — that points to SDA. If both are true, both may be appropriate, and a Support Coordinator can help you build the evidence for each.
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