What Is the Difference Between SIL and SDA? A Clear Guide for NDIS Providers in 2026

SIL and SDA Are Frequently Confused — and That Confusion Has Real Consequences

When participants, their families, or even new providers talk about "supported living", they often use SIL and SDA interchangeably. They are not the same. Getting the distinction wrong can mean a participant ends up without the right funding, a provider operates outside its registration scope, or a dwelling is described as SDA when it does not meet the required design standards. Under the strengthened NDIS Practice Standards framework being embedded through 2026, the consequences of misclassification have become more serious for registered providers.

This article explains what each term means, how the funding and registration rules differ, and what providers need to do to deliver both correctly.

What Is SIL — Supported Independent Living?

SIL stands for Supported Independent Living. It refers to the supports and staffing that help a participant with significant functional impairment to live as independently as possible, usually in a shared or individual residential setting. SIL funding pays for things like:

• Assistance with daily personal activities (showering, dressing, meal preparation)
• Overnight and active overnight support
• Supervision and prompting for safety
• Community participation supports delivered from the home base

SIL is a support category under the NDIS, not a housing product. It sits within the Assistance with Daily Life support category and is included in a participant's NDIS plan based on their assessed support needs. The NDIA assesses what level of shared or individual staffing is reasonable and necessary, and that funding follows the participant — not the building.

To deliver SIL, a provider must be registered with the NDIS Quality and Safeguards Commission under the registration group for Assistance with Daily Life. SIL providers are subject to the NDIS Practice Standards and must undergo either a certification audit (for providers delivering higher-risk or complex supports) or a verification audit, depending on their registration type.

What Is SDA — Specialist Disability Accommodation?

SDA stands for Specialist Disability Accommodation. It refers to the physical dwelling — the bricks, mortar, and specialist design features built or modified to meet the needs of participants with extreme functional impairment or very high support needs. SDA funding does not pay for staffing; it contributes toward the cost of providing purpose-built or significantly modified housing.

SDA is divided into four design categories, each representing a different level of physical accessibility and specialist feature:

1. Improved Liveability — improved physical access and better sensory features for participants with a cognitive or sensory impairment
2. Fully Accessible — high physical access for participants with significant physical impairment
3. Robust — very high levels of physical robustness and reduced maintenance for participants whose behaviours require a strong, resilient environment
4. High Physical Support — the highest level of physical access, including structural provisions for ceiling hoists and home automation

To receive SDA funding, a participant must meet strict eligibility criteria determined by the NDIA. To provide SDA, a dwelling must be enrolled with the NDIA under the SDA Rules and must meet the SDA Design Standard. Providers who own or manage SDA dwellings must register with the NDIS Commission under the SDA registration group, which is entirely separate from the SIL registration group.

Side-by-Side: Key Differences at a Glance

Can a Participant Have Both SIL and SDA?

Yes — and many participants with high support needs do. A participant might live in an SDA dwelling (a purpose-built Robust home, for example) while also receiving SIL supports from a registered SIL provider. The two funding streams run in parallel but are assessed and claimed separately.

Importantly, the SIL provider and the SDA provider can be the same organisation or different organisations. Where they are the same entity, the NDIS Commission expects clear separation of governance, conflict-of-interest management, and pricing to ensure the participant's interests are protected. This is an area auditors scrutinise closely under the strengthened framework.

What the Strengthened 2026 Framework Means for Providers Delivering Both

The NDIS Commission's strengthened Practice Standards — being progressively embedded through 2026 — sharpen the obligations on registered providers in several ways relevant to SIL and SDA delivery:

• Governance and operational management: Providers must demonstrate clear accountability structures for each registration group they hold. Holding both SIL and SDA registrations means separate, documented governance arrangements for each scope of service.
• Worker screening and training: SIL workers are subject to NDIS Worker Screening requirements. Where high intensity daily personal activities are involved, additional evidence of worker competency is required. SDA providers have distinct obligations around maintaining the dwelling in a safe and functional state and responding to participant maintenance requests.
• Incident management: Both SIL and SDA providers must have an NDIS Commission-compliant incident management system. SIL providers are particularly exposed on reportable incidents linked to support delivery; SDA providers have obligations around reportable incidents connected to the physical environment.
• Restrictive practices: SIL providers delivering supports to participants with behaviour support plans must comply with the NDIS Commission's restrictive practices requirements, including authorisation, reporting, and reduction planning. This obligation does not sit with SDA providers in relation to the dwelling itself.
• Participant choice and control: Under both streams, providers must support participants to exercise genuine choice — including the right to leave an SDA property or change their SIL provider without undue barriers. Bundled arrangements that make it difficult to separate housing from support are a compliance risk.

Common Mistakes Providers Make When Working Across SIL and SDA

Approved quality auditors consistently find the following non-conformances in providers operating in both spaces:

1. Conflating the funding streams in participant documents — service agreements that blur SIL and SDA obligations rather than treating them as distinct arrangements.
2. Operating outside registration scope — delivering what is effectively a SIL support without holding the correct registration group, or enrolling a dwelling as SDA without meeting the SDA Design Standard.
3. Insufficient conflict-of-interest management — where the same entity provides both SIL and SDA without documented safeguards to protect participants from pressure to stay in the same dwelling to retain support income.
4. Incomplete incident reporting — SIL incidents reported to the Commission but dwelling-related incidents (for the same participant in an SDA property) not captured or attributed to the SDA registration.
5. Pricing non-compliance — SDA providers charging participants fees outside the NDIA's SDA pricing arrangements, or SIL providers billing for supports not reasonably attributed to the approved support category.

A Practical Step List for Providers Clarifying Their Obligations

1. Confirm your NDIS Commission registration certificate — identify exactly which registration groups you hold (SIL, SDA, or both).
2. Map every participant to their funding streams — does their plan include SIL, SDA, or both? Are both enrolled and active?
3. Review your service agreements to ensure SIL and SDA obligations, pricing, and exit rights are clearly separated.
4. Audit your conflict-of-interest policy for adequacy if you deliver both streams to the same participant.
5. Check your incident management system captures incidents for each registration scope separately.
6. Confirm all SDA dwellings are enrolled with the NDIA and meet the relevant SDA Design Category requirements.
7. Prepare your audit evidence file for each registration group independently — auditors assess them as separate scopes.

If you are building or reviewing your compliance documentation across both streams, the 136-document SIL compliance kit available at ndiscompliant.com.au covers the governance, incident, restrictive practices, and service agreement templates most commonly requested during NDIS Commission certification audits.

Summary

SIL funds the people and supports that help a participant live independently. SDA funds the specialised home they live in. Both require separate NDIS Commission registration, separate audit evidence, and separate governance — and participants can access both at once. Under the strengthened Practice Standards being embedded through 2026, the distinction matters more than ever: providers who blur the two risk non-conformance findings, registration conditions, or referral for compliance action.