The Four NDIS SDA Design Categories Explained
Reviewed October 2026.
Specialist Disability Accommodation is not designed to one universal specification. The NDIS SDA Design Standard has four design categories that respond to different participant needs.
Improved Liveability
Improved Liveability combines physical access with design features that may support people with sensory, intellectual or cognitive impairment. Visibility, contrast, wayfinding and ease of movement can be central to the brief.
Fully Accessible
Fully Accessible housing is intended for people with significant physical impairment. Wheelchair access and circulation influence entrances, doors, bedrooms, bathrooms, kitchens, living areas and the external journey to the dwelling.
Robust
Robust SDA combines accessibility with resilient construction and safety features. Materials, fixtures and detailing are selected to reduce damage and reactive maintenance while supporting a safe home for residents and others.
Durability does not require an institutional appearance. Thoughtful planning can integrate robust elements into a warm residential design.
High Physical Support
High Physical Support combines high physical accessibility with features that support very high physical support needs. The brief can involve assistive technology, automated access, structural provisions, accessible environmental controls and electrical resilience.
The category changes the project
The nominated category can affect room sizes, clearances, structure, services, controls, materials and external works. It should be established before design is advanced and remain traceable through drawings, specifications, variations, inspections and final evidence.
Certification matters
For newly built SDA, an accredited SDA assessor provides design-stage and final as-built certification. Design-stage assessment gives the team an opportunity to resolve compliance issues on the documents rather than after construction.
The SDA Design Standard is currently under review. This article reflects the published framework available in October 2026 and should be checked against any later edition before use on a project.
Project-specific advice matters
Building, accessibility and SDA requirements depend on the site, design, intended occupants and current regulatory pathway. Engage the appropriate building professionals and, for SDA, an accredited SDA assessor for project-specific advice.
Official references
Planning a livable, accessible or SDA-intended project? Explore our specialist and accessible build service, or tell EJN Build about the project so the required design and delivery pathway can be considered early.
