Quick answer
SIL is the support workers. SDA is the building. SIL pays for staff time, SDA pays for specially designed accommodation. You can have one without the other, but participants with very high needs often have both.
The Short Version
SIL and SDA sit inside every NDIS housing conversation, and they get confused constantly — usually because both acronyms start with S, both relate to where you live, and the NDIS literature isn’t exactly breezy reading.
Here’s the clean version. Supported Independent Living (SIL) is the funding for the people who support you inside your home. Specialist Disability Accommodation (SDA) is the funding for the physical building itself — specially designed housing for participants whose disability requires structural features like wheelchair-accessible layouts, hoists, reinforced ceilings, and fully accessible bathrooms.
SIL funds staff. SDA funds the house. The two categories sit in different parts of your NDIS plan (Core Supports for SIL, Capital Supports for SDA) and they’re approved on different criteria.
SIL in Detail
Supported Independent Living pays for the support workers who help you live at home. It covers:
- Personal care — showering, dressing, toileting, hygiene
- Household tasks — cleaning, cooking, laundry, groceries
- Medication support — prompts or administration where qualification allows
- Overnight support — sleepover or active overnight depending on need
- Community access — getting to appointments, work, or activities
SIL is funded as a weekly package based on your agreed “roster of care” — essentially, a spreadsheet of every hour of support you need across a typical week. The NDIS multiplies those hours by the Price Guide rates and that’s your annual SIL funding. Most SIL packages run between $80,000 and $500,000 per year depending on support levels.
The key thing about SIL: the funding is ringfenced. It can only be used for SIL support. You can’t redirect SIL funding to pay for equipment, therapy, or other services, even if you have surplus. That’s different from most other Core Supports categories where funding is flexible.
SDA in Detail
Specialist Disability Accommodation pays for housing that’s been specifically designed and built for people with significant disability. SDA homes have structural features that standard housing doesn’t — things like:
- Full wheelchair accessibility in every room
- Ceiling hoists or reinforced ceilings to support hoists
- Wide doorways (minimum 850mm clear)
- Accessible bathrooms with roll-in showers
- Space for assistive technology and equipment
- Emergency systems and monitored call points
The NDIS classifies SDA into four design categories: Improved Liveability (basic accessibility), Fully Accessible, Robust (for participants whose behaviour may damage property), and High Physical Support (ceiling hoists, ventilation, power backup, bathroom accessible to use with assistance).
SDA funding doesn’t go to the participant — it goes to the housing provider, which is usually a separate organisation from the SIL provider. The participant lives in an SDA property for a reasonable market rent contribution (often 25% of DSP plus Commonwealth Rent Assistance) and the rest is funded through SDA payments from the NDIS.
The Crucial Point — SIL and SDA Are Usually Provided by Different Organisations
This trips up a lot of new participants. In most arrangements:
- The SDA provider owns or manages the physical building
- The SIL provider employs the support workers and delivers the daily support
You can change your SIL provider without moving house. You can change SDA properties without changing SIL provider (though in practice the logistics get complicated). The formal separation exists for a reason — the NDIS doesn’t want SDA providers forcing tenants to use a specific SIL provider.
Who Needs SIL, Who Needs SDA, Who Needs Both?
| Situation | SIL | SDA |
|---|---|---|
| Live at home, need daily support with personal care and household tasks | Yes | No |
| Live in a wheelchair-accessible apartment (not SDA), need daily support | Yes | No |
| Very high physical support needs, need purpose-built housing with hoists and accessible bathroom | Yes | Yes |
| Moderate support needs, family home is accessible enough with some modifications | Possibly | No |
| High behaviour support needs requiring robust construction | Yes | Yes (Robust category) |
| Lower support needs (a few hours a week), live in own home | No (Assistance with Daily Life instead) | No |
How to Get SIL Approved in Your Plan
SIL is approved based on evidence of your daily support needs. The NDIS wants to see:
- Allied health assessments (OT is the most important — they can specifically assess your daily living support needs)
- A roster of care document showing the hours of support you actually need across a week
- Evidence that informal supports (family) can’t realistically cover the need
- Medical evidence of your condition and its impact on daily functioning
Your support coordinator and allied health team are the ones who typically prepare this evidence. If you don’t have SIL in your current plan but you think you need it, raise it at your next plan review with clear evidence.
How to Get SDA Approved in Your Plan
SDA is harder to get than SIL. The NDIS only funds SDA where:
- Your disability requires structural housing features (not just convenience modifications)
- Standard accessible housing won’t meet your needs
- The cost of SDA is genuinely justified versus alternatives
Most SDA applications need a formal SDA assessment from an approved assessor (usually an OT). The report specifies which SDA design category you need. If your plan is approved for SDA, you then work with SDA providers and your support coordinator to find a suitable vacancy.
Can You Use SIL Without SDA?
Absolutely — and this is the most common arrangement. Many SIL participants live in:
- Their own rented or owned home
- Shared group homes that aren’t SDA-registered
- Social housing properties
- Family homes where they’ve always lived
The support workers come to wherever you live. SDA isn’t required.
Can You Use SDA Without SIL?
Technically yes, but in practice rarely. SDA housing is designed for participants with significant disability who usually also need daily support. If you need the structural features of SDA but not the daily support, it usually suggests your disability picture needs closer review — either you need more support than you realise, or the case for SDA isn’t as strong as you think.
Getting Help Mapping Your Options
Housing decisions are among the biggest a participant makes, and the SIL/SDA landscape is complicated enough that DIY is rarely optimal. Your support coordinator’s job is to help you work through options. If you don’t have a support coordinator in your plan, raise it at your next review — specialist support coordination is specifically designed for situations like housing transitions.
At Aussie Bridge Care, we’re a registered SIL provider. We aren’t an SDA provider, which means we have no conflict of interest when we help you think about whether SDA makes sense for your situation. If you want to talk through your options, call 07 3472 7562.
