SIL vs SDA: What Each One Actually Funds

The one-line difference

SIL is the support. SDA is the space. One funds the people who help you through the day; the other funds an accessible, purpose-built dwelling to do it in.

They sound like alternatives because they are often discussed in the same plan meeting, but they are not competing options. They sit in different budgets, are assessed against different tests, and answer different questions. SIL answers who helps you. SDA answers what the building has to do.

What SIL actually funds

Supported Independent Living pays for a roster of staff in a shared home. Two to five residents typically share that roster across the day, with one-to-one time carved out for the parts that cannot be shared, and the NDIA funds each resident's share of it.

It comes out of your Core budget, under Assistance with Daily Life. Critically, it does not pay your rent. You pay rent to whoever owns the property, exactly as any other tenant would, and SIL sits on top of that paying only for support. We set out the full split in who pays for what in SIL.

Most people with SIL live in ordinary rental housing. No special building features are involved, because the need being met is a support need rather than a physical one.

What SDA actually funds

Specialist Disability Accommodation pays for the dwelling itself: the bricks and mortar, the accessible bathroom, the ceiling hoist, the reinforced walls, the wider doorways. The money goes to whoever owns and maintains the building, not to you and not to your support provider.

It comes from your Capital budget and it is deliberately hard to get. The test is extreme functional impairment or very high support needs, evidenced properly, and only a small fraction of NDIS participants are ever funded for it. If your bathroom simply needs a grab rail, that is home modifications, not SDA.

Every SDA dwelling is enrolled with the NDIA against a design category, which tells you what the building is actually built to do. The four categories are Improved Liveability, Fully Accessible, Robust and High Physical Support. Some homes also carry Onsite Overnight Assistance, meaning the building is set up for a worker to be there through the night.

If you are funded for SDA you also pay a Reasonable Rent Contribution toward it, commonly calculated as a share of the Disability Support Pension plus any Commonwealth Rent Assistance you receive.

Side by side

• What it buys. SIL buys support hours. SDA buys a building.
• Which budget. SIL is Core, under Assistance with Daily Life. SDA is Capital.
• Who receives the money. SIL goes to your support provider. SDA goes to the housing provider.
• How hard it is to get. SIL is assessed on daily living support needs. SDA requires extreme functional impairment or very high support needs, and far fewer people qualify.
• Rent. Neither one covers ordinary rent. With SDA you pay a Reasonable Rent Contribution instead.
• How common. Plenty of people have SIL and no SDA. Far fewer have SDA at all.

Why they are kept separate on purpose

It would be simpler if one provider supplied both, and for a long time that is how group homes worked. The NDIS moved away from it deliberately, and the reason matters to you.

When your landlord and your support provider are the same organisation, changing support means moving house. That is an enormous amount of leverage to hand to one company, and it is the single biggest reason people stay with support they are unhappy with. Keeping the two separate means you can change your support provider and keep your home, or move house and keep your workers.

So when you are comparing options, it is a fair and reasonable question to ask who owns the building and whether you can change one without losing the other.

Which one applies to you

If your need is help with daily living, personal care, routines, medication or building skills, and an ordinary house would be fine once that help is there, you are describing SIL.

If the building itself is the barrier, if you cannot transfer without a hoist, if you need a bathroom you can actually get a wheelchair into, or if the physical environment has to change before any amount of support would work, you are describing SDA, and often SIL alongside it.

If neither quite fits because you want to choose where and how you live rather than move into an existing household, the option to raise is Individualised Living Options. We compare the two in SIL vs ILO, and the full set of arrangements is laid out in our guide to NDIS housing options.

How this looks at AllCare

We provide SIL across our homes. Four of the homes we list are SDA enrolled to the High Physical Support standard with Onsite Overnight Assistance: Narellan and Campbelltown, plus Granville and Blacktown, where Manora Living is the SDA provider. That means they are built for people who need the physical environment to do real work as well as the staffing. Our SDA homes in Sydney page sets them side by side.

If you are unsure which of these your plan supports, that is a normal place to be and it is worth a conversation before you start looking at houses. Talk to your support coordinator, or call us and we will give you a straight answer about what fits, including when the answer is that we are not the right option.

Frequently asked questions

Can you have SIL and SDA at the same time?

Yes, and it is common for people with high physical support needs. They are funded separately, from different parts of your plan, so one can be approved without the other. Having SIL does not make SDA easier to get, and being in an SDA dwelling does not automatically fund your support.

Does SIL or SDA pay my rent?

Neither pays ordinary rent. SIL funds support only, and you pay rent to the property owner like any tenant. If you are funded for SDA you pay a Reasonable Rent Contribution toward the dwelling, commonly worked out as a share of the Disability Support Pension plus any Commonwealth Rent Assistance.

Why is SDA so much harder to get than SIL?

Because it funds a building rather than a service. SDA is capital funding for housing that has to be designed, built and maintained to an enrolled standard, so the test is extreme functional impairment or very high support needs with proper evidence. Support needs that can be met in an ordinary home are met through SIL instead.

What do the SDA design categories mean?

They describe what the building is built to do. Improved Liveability covers homes designed for people with sensory, intellectual or cognitive impairment. Fully Accessible covers significant physical access. Robust covers homes built to be resilient and to reduce risk to the resident and the people around them. High Physical Support covers homes for people needing very high levels of physical support, with features such as ceiling hoists and structural provision for assistive technology.

Can I change support provider without moving out?

That is exactly why the NDIS separates housing from support. When the landlord and the support provider are different organisations you can change one without losing the other. It is a fair question to ask any provider before you commit, and the answer should be straightforward.