SDA and SIL are not the same thing
The single biggest misconception about SDA is that it covers housing costs broadly. SDA covers the specialist dwelling. It flows to the dwelling provider, which may be a Specialist Disability Accommodation provider, a community housing organisation, or in some cases the participant's own family trust.
Supported Independent Living (SIL) covers the support workers who assist a participant in that dwelling. It flows to the support provider. SDA and SIL are separate funding categories in a participant's plan and go to separate providers. The same organisation can be both the SDA provider and the SIL provider, but they are separate commercial and regulatory relationships.
| Funding category | Covers | Paid to |
|---|---|---|
| SDA | The specialist dwelling: design, construction, modification, and upkeep of a purpose-built disability housing asset. | SDA dwelling provider (registered with NDIA) |
| SIL | Support workers providing daily assistance in the dwelling: personal care, meals, medication, community access. | Support provider (registered NDIS provider) |
A participant can have SDA without SIL (they live independently in an accessible dwelling), SIL without SDA (they receive support at home or in mainstream housing), or both. Choice and control means a participant can choose their SDA dwelling provider and their SIL provider separately.
Who is eligible for SDA
SDA is not available to all NDIS participants. Approximately 6% of NDIS participants receive SDA funding. Eligibility requires:
- --Extreme functional impairment, or very high support needs, as assessed by the NDIA
- --A determination that SDA is the most cost-effective way to meet the participant's housing and support needs (the NDIA compares the cost of SDA against the alternative, typically mainstream housing plus higher SIL)
- --An SDA Housing Plan, usually prepared by an Occupational Therapist and/or Support Coordinator, recommending a specific design category
- --NDIA approval of SDA funding in the participant's plan
The SDA eligibility criteria are defined in the NDIS (Specialist Disability Accommodation) Rules 2020. A participant cannot self-nominate for SDA. The determination is made by the NDIA as part of the planning process.
The 4 SDA design categories
SDA funding amounts vary by design category. The category reflects what the dwelling must be designed to do, not the level of support the participant receives inside it.
Improved Liveability
ILParticipants with sensory, cognitive, or intellectual impairments who need a dwelling with improved physical access and design features to support independence.
- --Improved lighting, contrast, and wayfinding for sensory or cognitive impairments
- --Reasonable step-free access within the dwelling
- --Basic structural features to support assistive technology
Lower SDA funding amounts across all building types. Not intended for participants with significant physical support needs.
Fully Accessible
FAParticipants with significant physical impairments who need a dwelling that provides full accessibility for a wheelchair user but do not require a high physical support environment.
- --Full wheelchair access throughout the dwelling
- --Accessible bathroom and kitchen
- --Step-free access from the street and between rooms
- --Wider doorways and turning circles for power wheelchairs
Moderate SDA funding amounts. The most common design category for participants with physical disability.
High Physical Support
HPSParticipants with significant physical impairments who require very high levels of physical support infrastructure: ceiling hoists, structural reinforcement, assistive technology integration.
- --Ceiling hoists throughout the dwelling or in key areas
- --Structural reinforcement to support hoist installation
- --Emergency power back-up for life-sustaining equipment
- --Conditions for technology-assisted care
- --Assistive technology wiring and infrastructure
Highest SDA funding amounts. Reflects the significant capital cost of this design specification.
Robust
RBParticipants who may damage their dwelling due to their disability. The dwelling is built or modified to withstand higher levels of wear, including participants with behaviours of concern.
- --Reinforced walls, doors, and fixtures
- --Reduced ligature points and safety-by-design features
- --Materials that withstand higher physical stress
- --Layouts that support visibility and supervision
High SDA funding amounts. Reflects the specialised construction and safety engineering involved.
Building types and how they affect funding
SDA funding amounts are also differentiated by building type. Apartments have different amounts from houses; group homes have different amounts from villas. The same design category delivers different funding in each building type.
| Building type | Description |
|---|---|
| Apartment | Self-contained unit in a multi-unit building. Can be purpose-built SDA or an existing building modified to SDA specification. |
| Villa / Duplex / Townhouse | Smaller attached or semi-detached dwellings, typically 1-2 bedrooms. Often better suited to participants who want a less institutional environment. |
| House | Standalone dwelling. Allows more flexible layout for High Physical Support or Robust design. Higher capital cost but more design flexibility. |
| Group Home | Shared accommodation for 3-5 participants. This is the legacy model in disability housing. The NDIA is progressively moving away from new Group Home SDA enrolments in favour of individual dwellings. |
SDA funding amounts per design category and building type are published in the annual NDIS Pricing Arrangements for Specialist Disability Accommodation, available from the NDIS website. Amounts are quoted as annual per-participant figures and are pro-rated by the NDIA when a participant moves in or out during a plan year.
Location and the number of residents
SDA funding amounts are adjusted by location: metropolitan areas, outer metropolitan areas, and regional areas attract different rates. This reflects the difference in land, construction, and operating costs across locations.
Where a dwelling is shared between more than one participant, the SDA funding is paid per participant but at a reduced per-participant rate that reflects the shared cost of the dwelling. The more participants sharing a dwelling, the lower the per-participant SDA payment. This is one of the structural drivers of the group home model historically, and one of the tensions in the shift toward more individual housing.
Onsite Overnight Assistance loading
Some SDA dwellings are designed to include a dedicated overnight support worker room: a separate bedroom and bathroom for a worker who is present overnight but not necessarily on active duty throughout the night. This is called Onsite Overnight Assistance (OOA).
Where a dwelling is designed and registered to include OOA, the SDA funding amount includes an additional OOA loading. This loading applies to the dwelling, not to the SIL provider who employs the overnight worker. It compensates the dwelling provider for the cost of building and maintaining the additional accommodation.
Not all SDA dwellings include OOA. Whether a dwelling is registered with OOA is determined during the SDA enrolment process with the NDIA.
The Reasonable Rent Contribution
SDA does not cover the full cost of a participant's housing. Participants are expected to contribute to their own housing costs through the Reasonable Rent Contribution (RRC). The RRC is calculated as 25% of the Disability Support Pension (DSP) plus 100% of the Commonwealth Rent Assistance (CRA) the participant receives.
The dwelling provider collects the RRC directly from the participant or their nominee. The NDIA pays the SDA funding amount separately. Together, the SDA payment and the RRC are intended to cover the reasonable cost of the specialist dwelling.
Common misconception: SDA does not make housing free for participants. The RRC is an ongoing contribution that participants pay from their DSP and CRA. When modelling SDA arrangements, dwelling providers need to account for the RRC as participant income separate from NDIA payments.
Indicative SDA funding: design category comparison
The table below illustrates how SDA funding typically varies across design categories and building types in a metropolitan location, for a single-resident dwelling without OOA loading. These figures are indicative based on the structure of the NDIS Pricing Arrangements for SDA. Do not use these figures for financial modelling or investor projections. Always use the current published amounts from the NDIS website.
| Design category | Apartment | House | Villa/Duplex |
|---|---|---|---|
| Improved Liveability | Lower range | Lower range | Lower range |
| Fully Accessible | Moderate | Moderate-higher | Moderate |
| High Physical Support | High | Highest | High |
| Robust | High | High-highest | High |
Indicative relative comparisons only. Exact annual per-participant SDA amounts by design category, building type, location, and resident number are published in the NDIS Pricing Arrangements for Specialist Disability Accommodation (updated annually, effective 1 July). Source: NDIS (Specialist Disability Accommodation) Rules 2020; NDIS Pricing Arrangements for SDA.
Where to find authoritative SDA information
- --NDIS Pricing Arrangements for Specialist Disability Accommodation (annual, effective 1 July): ndis.gov.au
- --NDIS (Specialist Disability Accommodation) Rules 2020: legislation.gov.au
- --NDIS SDA Design Standard: The technical specification for what each design category must achieve, published by the NDIA
- --Your participant's Support Coordinator or LAC: for guidance on whether a specific participant may be eligible for an SDA assessment