If you’ve spent any time reading about NDIS home and living supports, you’ve almost certainly run into these two acronyms sitting side by side: SIL and SDA. They get used interchangeably more often than they should, and for families new to the NDIS, that confusion is completely understandable — both terms are about where and how you live.
Here’s the short version before we go further: SIL pays for the people who support you. SDA pays for the house you live in. They’re two completely different NDIS budgets, assessed separately, and many participants end up using both together. This guide unpacks exactly what each one covers, how eligibility works, and how to figure out which one (or both) applies to you.
The Quick Answer
| QA | SIL | SDA |
| What it funds | Support workers who help with daily tasks | The physical home and its accessibility features |
| NDIS budget category | Core Supports | Capital Supports |
| Who it’s paid to | Used to pay your support provider for staff hours | Paid directly to the registered SDA provider as a rental subsidy |
| Who typically needs it | Participants needing regular or 24/7 assistance with daily living | A small group with extreme functional impairment or very high support needs |
| Covers rent? | No | No — you pay a reasonable rent contribution, and SDA covers the rest |
| Can you have both? | Yes | Yes |
What Is SIL, Again?
Supported Independent Living (SIL) is funding for a support worker to help or supervise you with everyday tasks — personal care, cooking, cleaning, and building the skills to live as independently as possible. It can be shared across housemates in the one home or delivered one-to-one, and support can range from a few hours a week to full 24/7 assistance. We’ve covered SIL in detail, including how the Roster of Care process works, in our guide to Supported Independent Living in Sydney.
SIL is funded under your plan’s Core Supports budget, and it only ever pays for support — never for rent, groceries, utilities, or the building itself.
What Is SDA, Exactly?
Specialist Disability Accommodation (SDA) is a much narrower category. It funds purpose-built or heavily modified housing for people with extreme functional impairment or very high support needs — the kind of needs that standard housing, even with minor modifications, simply cannot safely accommodate. The NDIA estimates that only around 6% of NDIS participants meet the bar for SDA.
SDA housing is enrolled under one of four design categories, each built to a different standard:
- Improved Liveability – for people with sensory, intellectual, or cognitive impairments who benefit from better lighting, layout, and acoustics
- Fully Accessible – for people who need physical access features like wider doorways and step-free access, including wheelchair users
- Robust – for people with complex behavioural support needs, built to be safe and resilient
- High Physical Support – for people with very high physical and clinical support needs, often including ceiling hoists, backup power, and assistive technology integration
SDA funding sits in your plan’s Capital Supports budget and is not money you manage yourself. It’s paid directly to your registered SDA provider as a rental subsidy, on top of a reasonable rent contribution you pay from your own income (similar in concept to rent in social housing).
Can You Have Both SIL and SDA?
Yes — and for many participants with higher support needs, this is exactly how it works. SDA pays for the specialist-built home; SIL pays for the support workers who help you inside it. Because they’re separate, funded through different budgets and different providers, you can change your SIL support provider without having to move house, and vice versa.
If you’re only weighing up a short break away from home rather than a long-term accommodation change, it’s worth noting that neither SIL nor SDA is the right fit — that’s what Short-Term Accommodation and respite care is for instead.
How Are SIL and SDA Assessed?
The two are applied for through different, though related, processes:
For SIL, your provider builds a Roster of Care (RoC) — a weekly breakdown of exactly how much support you need and when — which is submitted to the NDIA to determine your funding level.
For SDA, the NDIA requires a formal assessment of your functional impairment, typically supported by evidence from an Occupational Therapist and other allied health professionals, before SDA funding is included in your plan. This determines which of the four design categories fits your needs.
Both start from the same place: a home and living goal in your NDIS plan, discussed at your planning meeting or a plan review. If you’re not yet at that stage, our guide on how to apply for the NDIS in 2026 walks through the eligibility and access process from the beginning. A Support Coordinator or Case Manager can also help you understand which pathway — SIL, SDA, or both — actually fits your situation.
A Simple Way to Think About It
Picture two participants:
- One lives independently in their own rented unit but needs help each morning and evening with personal care and meal preparation, plus some overnight support a few nights a week. This is a classic SIL scenario — the home is standard, the support is what’s funded.
- Another has a high-level spinal cord injury and needs a ceiling hoist, reinforced flooring, and emergency backup power just to live safely — their current home simply cannot be modified enough. This is a SDA scenario, and they will very likely need SIL as well to deliver the actual day-to-day support inside that home.
Which One Do You Need?
As a general guide:
- If your main challenge is needing help with daily tasks, but your current home works fine (or could work fine with minor changes), you’re most likely looking at SIL only.
- If your home itself is the barrier — because of extreme functional impairment or very high support needs — SDA, usually alongside SIL, is worth discussing with your planner or Support Coordinator.
- If you’re unsure, that uncertainty is completely normal. This is exactly the kind of question a Support Coordinator or experienced provider can help you untangle before your next planning meeting.
How Assure Ability Can Help
Assure Ability offers both Supported Independent Living and Specialist Disability Accommodation across Greater Sydney, led by a healthcare-professional team who can help you work out which combination of supports actually fits your goals. You can browse our current openings on our SIL and SDA Vacancies page, learn more about our approach on our About Us page, or find more answers on our NDIS FAQs page.
Frequently Asked Questions
Is SDA better than SIL?
Neither is “better” — they fund completely different things. SIL pays for support workers; SDA pays for specialist housing. Most participants only need SIL. SDA is reserved for the small group with extreme functional impairment or very high support needs.
Do I automatically get SDA if I have SIL?
No. SIL and SDA are assessed and funded completely separately. You can have SIL without SDA, and in rare cases SDA without ongoing SIL, though most SDA residents also receive SIL support.
Who is eligible for SDA?
Broadly, people with extreme functional impairment or very high support needs whose current housing cannot be modified enough to support them safely, even with assistance. The NDIA estimates only around 6% of participants meet this bar.
Does SDA cover my rent completely?
No. You pay a reasonable rent contribution from your own income, similar to social housing rent, and the NDIA pays the remainder directly to your SDA provider.
Can I change my SIL provider without losing my SDA home?
Yes. Because SIL and SDA are funded and delivered separately, you can change who provides your daily support without needing to move out of your SDA home.
How do I find out which one I need?
The best starting point is a conversation with your Support Coordinator, Local Area Coordinator, or planner at your next NDIS planning meeting or review. Contact Assure Ability if you’d like help thinking it through.