SIL vs SDA: What's the Difference? (Simple Explanation 2026)
Andre Smith
Co-founder & CEO
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SIL vs SDA: What’s the Difference?
SIL and SDA are two of the most confused NDIS terms. Here’s the simple version: SIL pays for support workers who help you with daily living. SDA pays for the building you live in. You can have one without the other, or both together.
Think of it like this: SDA is the house, SIL is the help you get inside the house.
Quick Comparison: SIL vs SDA
| Feature | SIL (Support Services) | SDA (The Building) |
|---|---|---|
| What is it? | 24/7 support from care workers | Specialist housing/accommodation |
| NDIS Category | Core Supports - Assistance with Daily Life | Capital Supports |
| Pays for | Support workers, care, help with tasks | Rent for modified housing |
| Eligibility | High support needs | Extreme functional impairment + housing need |
| Typical cost | $120k-$300k/year | $40k-$150k/year rent |
| Can you have it alone? | Yes | Yes |
| Where funded from | Your NDIS plan Core budget | Separate SDA line item |
What is SIL (Supported Independent Living)?
SIL is NDIS funding for support services when you live in a shared home with other people with disabilities.
What SIL Covers
SIL funding pays for:
- 24/7 support workers in your home
- Help with personal care (showering, dressing)
- Meal preparation and cooking assistance
- Medication management
- Household tasks and cleaning
- Support to access the community
- Individual goal planning
What SIL Does NOT Cover
- ❌ The accommodation (rent/mortgage)
- ❌ Food and groceries
- ❌ Utilities (electricity, water, internet)
- ❌ Transport to appointments (funded separately)
- ❌ Allied health services
SIL is about the SUPPORT, not the building.
Who Needs SIL?
You might need SIL if you:
- Need help with most daily living tasks
- Require overnight support availability
- Benefit from 24/7 assistance
- Want to live with others in a shared arrangement
- Need medication management and health monitoring
What is SDA (Specialist Disability Accommodation)?
SDA is NDIS funding for the physical property designed or modified for people with extreme functional impairment.
What SDA Covers
SDA funding pays for:
- Rent for specialist housing (not support)
- Purpose-built or heavily modified accommodation
- Accessible features (wide doorways, ceiling hoists, etc.)
- Building design categories (Basic, Improved Liveability, Fully Accessible, Robust, High Physical Support)
What SDA Does NOT Cover
- ❌ Support workers (that’s SIL)
- ❌ Regular rental properties (even if modified)
- ❌ Living expenses
- ❌ Care services
SDA is about the BUILDING, not the support.
Who Needs SDA?
You might need SDA if you have:
- Extreme functional impairment or very high support needs
- Significant physical disability requiring home modifications
- Need for ceiling hoists, specialized bathroom equipment
- Behavioral needs requiring robust building design
- Housing solutions that can’t be met through regular rental market
Important: SDA is one of the hardest NDIS supports to get approved. Only 6% of NDIS participants receive SDA funding.
Can You Have SIL Without SDA?
Yes. Many people have SIL in regular rental properties.
You might:
- Live in a normal house or apartment
- Rent through the private market or public housing
- Pay your own rent (or use DSP/pension for rent assistance)
- Have SIL support workers come to your home
Example: Three NDIS participants share a rental house in a normal suburb. They pay their own rent. They have SIL funding in their plans for 24/7 support workers who assist them in the home.
Can You Have SDA Without SIL?
Yes. Some people live in specialist accommodation without 24/7 support.
You might:
- Need accessible housing due to physical disability
- Not require 24/7 support workers
- Manage your own care with occasional supports
- Have a partner/family member who provides care
Example: Someone with high-level spinal injury needs fully accessible housing with ceiling hoists and wide doorways (SDA). They manage their own care during the day and have overnight support workers (funded from Core, not SIL).
Can You Have Both SIL and SDA?
Yes. This is common for people with very high support needs.
You receive:
- SDA funding for rent in specialist accommodation
- SIL funding for 24/7 support services in that accommodation
Example: Someone with complex physical and cognitive support needs lives in a Fully Accessible SDA property with ceiling hoists and specialized bathroom. They have SIL funding for 24/7 support workers.
This is the most expensive NDIS support arrangement (often $200k-$450k per year combined).
How to Apply for SIL
Step 1: Functional capacity assessment
- OT or specialist assessment showing high support needs
- Evidence you need 24/7 assistance
Step 2: NDIS planning meeting
- Present evidence of support needs
- Explain why SIL is needed vs lower support options
- May require quotes from SIL providers
Step 3: If approved
- SIL included in your NDIS plan under Core Supports
- Allocated to “Assistance with Daily Life (Supported Independent Living)”
- Work with support coordinator to find SIL provider
Timeline: 3-6 months from assessment to approval
How to Apply for SDA
Step 1: SDA eligibility assessment
- Must demonstrate extreme functional impairment
- Show housing can’t be met through rental market modifications
Step 2: SDA assessment report
- Specialist assessment (OT or similar)
- Evidence of specific design requirements
- Justification for SDA design category needed
Step 3: NDIS decision
- SDA team reviews application
- Much stricter eligibility than SIL
- May take 6-12 months
Step 4: If approved
- SDA included as separate line item in plan
- Work with support coordinator to find SDA vacancy
- May take additional months to find suitable property
Warning: SDA has very strict eligibility. Most NDIS participants don’t qualify.
SIL vs SDA: Which Do You Need?
You might need SIL if:
- ✓ You need help with daily tasks (showering, cooking, medication)
- ✓ You want to live with others in a shared home
- ✓ You need overnight support availability
- ✓ Regular housing works fine for you physically
- ✓ You need assistance, not building modifications
You might need SDA if:
- ✓ You have extreme functional impairment
- ✓ Standard housing can’t accommodate your physical needs
- ✓ You need ceiling hoists, specialized bathrooms, wide doorways
- ✓ Regular rental modifications won’t work
- ✓ You need robust building design for behavioral support
You might need BOTH if:
- ✓ You have extreme functional impairment (SDA eligibility)
- ✓ You also need 24/7 support services (SIL needs)
- ✓ Independent living isn’t safe or appropriate
- ✓ You have complex physical and support needs
Common Mistakes About SIL vs SDA
Mistake 1: “SDA includes support workers”
Wrong. SDA is only the building. Support is funded separately (SIL or Core Supports).
Mistake 2: “I need SDA to get SIL”
Wrong. You can have SIL in any accommodation, not just SDA properties.
Mistake 3: “SIL is for everyone who needs support”
Wrong. SIL is for people with high support needs living in shared arrangements. If you need lower-level support, you might have regular Core Supports instead.
Mistake 4: “If I have SIL, I automatically get SDA”
Wrong. SDA has much stricter eligibility. You can have SIL without SDA.
Mistake 5: “SDA pays for everything”
Wrong. SDA only pays rent. You still pay for food, utilities, personal expenses.
Real-World Examples
Example 1: SIL Only
Sarah has intellectual disability and autism. She needs help with cooking, cleaning, and managing her day. She lives in a shared house with two other NDIS participants in a regular suburb. They split a normal rental property. Sarah has SIL funding ($150k/year) for support workers who are there 24/7.
SIL: Yes (high support needs)
SDA: No (regular house works fine)
Example 2: SDA Only
David uses a powered wheelchair after a spinal injury. He’s highly independent and manages his own care during the day. He lives alone in a Fully Accessible SDA apartment with ceiling hoists, wide doorways, and accessible bathroom. He has overnight support workers (Core Supports, not SIL).
SIL: No (doesn’t need 24/7 shared living support)
SDA: Yes (needs specialist accessible housing)
Example 3: Both SIL and SDA
Maya has cerebral palsy with complex physical and cognitive support needs. She lives in a High Physical Support SDA house with three other residents. She needs 24/7 assistance with all daily tasks, medication management, and mobility transfers using ceiling hoists.
SIL: Yes ($200k/year for 24/7 support)
SDA: Yes ($80k/year for specialist accommodation)
Total: $280k/year
Frequently Asked Questions
Can I choose who I live with in SIL? You have input, but providers assess compatibility when considering new residents. You’ll usually meet current residents before moving in.
How much does SIL cost? SIL typically ranges from $120,000 to $300,000 per year depending on your support needs. The NDIS pays this from your Core Supports budget.
How much does SDA cost? SDA rent ranges from $40,000 to $150,000 per year depending on the design category and location. The NDIS pays this as a separate SDA line item (not from your Core budget).
Can I have SIL but live alone? Generally no. SIL is specifically for shared living arrangements. If you need 24/7 support but want to live alone, you’d typically have high-level Core Supports instead.
Can I live in SDA alone? Yes. SDA can be for solo living if that’s what you need and it’s in your plan.
What happens if my SIL provider is bad? You can change SIL providers. Work with your support coordinator to find a new provider and give notice to your current one.
What happens if I lose SDA? If SDA is removed from your plan, you’d need to move to non-SDA accommodation (regular rental). You can appeal the decision.
Do I pay anything?
For SIL: No (NDIS pays the provider directly).
For SDA: You may pay a “reasonable rent contribution” (usually equivalent to Commonwealth Rent Assistance + 25% of DSP).
You always pay for: Food, utilities, personal items, entertainment.
Find SIL and SDA Providers
Browse SIL providers on Carevo to find quality supported living homes in your area. Compare providers, arrange site visits, and connect with services that match your needs.
Call 1800 953 253 to discuss your SIL and SDA options with an NDIS specialist.
Still confused? The key difference:
- SIL = Support services (workers helping you)
- SDA = Specialist building (accessible housing)
You can have one without the other, or both together if you have very high support needs.
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