Two of the most confused acronyms in the NDIS are SIL and SDA. They sound similar, both relate to housing, and they are often discussed in the same breath — but they fund completely different things. Mixing them up leads to plans that fall short of what the participant actually needs.
The Short Version
SIL pays for the support workers in your home. SDA pays for the home itself. Most participants who need disability housing have SIL only, because they live in standard rental housing. A smaller group have both — they live in a purpose-built SDA dwelling and receive SIL support inside it.
Supported Independent Living (SIL) — In Detail
SIL is funded under Core Supports as ‘Assistance with Daily Life — Shared Living Arrangements’. It pays for the workers who help with personal care, meals, household tasks, medication, behaviour support, and skill-building inside the home.
SIL has three funding levels:
- Lower Needs — for participants needing some assistance during waking hours but who are reasonably independent overnight.
- Standard Needs — the most common level, with support throughout the day and overnight sleepover.
- Higher Needs — active overnight support, two-worker assistance for some tasks, and frequent intervention.
SIL does not cover rent, utilities, or food. The participant pays for those out of their own income (usually the Disability Support Pension and Commonwealth Rent Assistance).
Specialist Disability Accommodation (SDA) — In Detail
SDA is funded under Capital Supports. It is for participants whose physical or behavioural needs require purpose-built or significantly modified housing — accessible bathrooms, hoists, reinforced walls, sound insulation, robust construction, or layouts that accommodate complex care.
SDA has four design categories:
- Improved Liveability — for participants with sensory, intellectual, or cognitive disability
- Fully Accessible — for participants with significant physical disability
- Robust — for participants whose disability includes destructive behaviour
- High Physical Support — the highest support level, including ceiling hoists and emergency power
SDA funding does not pay rent in the conventional sense — it pays the SDA dwelling provider for the cost of building and maintaining the specialised dwelling. The participant still pays a ‘reasonable rent contribution’ from their income, capped at 25% of the Disability Support Pension plus Commonwealth Rent Assistance.
How They Fit Together
Three common scenarios:
- SIL only. Most SIL participants live in standard rental housing — a regular share house in a regular suburb. The home is not modified beyond what is reasonable for any tenant. The participant has SIL funding for the support workers.
- SDA only. Some participants need purpose-built accommodation but do not need round-the-clock support. They might live in an SDA dwelling and receive in-home support during the day rather than full SIL.
- SIL plus SDA. Participants with both physical accessibility needs and high support needs often have both — a purpose-built SDA dwelling and SIL support workers inside it.
Who Qualifies For SDA
SDA is more tightly funded than SIL. The NDIA looks for evidence that the participant’s disability requires specialised housing rather than standard housing — for example:
- Severe physical disability requiring ceiling hoists and full accessibility
- Behaviours of concern requiring robust construction
- Complex medical needs requiring emergency power or specialised infrastructure
- Severe sensory or cognitive disability requiring specific design features
Participants who would do well in standard rental housing — with or without minor modifications — generally do not qualify for SDA. The NDIS expects standard housing to be the default option where it is suitable.
How To Apply
SIL is requested at planning or plan review. The NDIA assesses the level of support based on a SIL Assessment, often informed by allied health reports.
SDA is also requested at planning or plan review, but the assessment is more involved. It usually requires reports from allied health (occupational therapy, physiotherapy, behaviour support) demonstrating that standard housing cannot meet the participant’s needs. Approval rates are lower than for SIL.
Common Mistakes
- Asking for SDA when SIL is the right answer. Some families assume SDA is the gateway to disability housing. It is not — most disability housing is SIL in standard rental dwellings, not SDA.
- Assuming SIL is automatic with intellectual disability. SIL is funded based on support needs, not diagnosis. Some adults with intellectual disability do well in their own home with several hours of support each day rather than full SIL.
- Confusing SIL with respite. SIL is permanent or long-term housing. Short Term Accommodation (STA) covers respite stays — a different funding category.
FAQs
Q1. Can I have SIL without SDA?
Yes. Most SIL participants live in standard rental housing without SDA funding. SDA is only for participants whose disability requires specialised dwelling features.
Q2. Can I have SDA without SIL?
Yes — though it is less common. Some participants live in SDA dwellings but only need in-home support during the day rather than full SIL.
Q3. Who pays the rent in a SIL home?
The participant. SIL pays for the support workers, not the housing. Most SIL participants pay rent from their Disability Support Pension and any Commonwealth Rent Assistance they receive.
Q4. How long does it take to get SDA approved?
Often longer than SIL — typically months, sometimes longer than a year. The evidence requirements are more involved and approval rates are lower.
Q5. Can I move between SIL homes?
Yes. SIL is the participant’s home and they have the right to leave. Most providers ask for a planned transition rather than a sudden exit, but no participant is locked in.
