What are the SDA design categories, and how do you know which one you need?
By The Find My SDA Team · Updated 05 Sep 2026
Short answer
The NDIS uses four SDA design categories: Improved Liveability, Fully Accessible, Robust and High Physical Support. Each one matches a different level of physical access and support need, from sensory and cognitive support through to full-time physical care. The NDIS decides your category using evidence like reports from your occupational therapist or allied health team.
If you're new to Specialist Disability Accommodation (SDA), the design categories can feel confusing. The NDIS splits SDA housing into four design categories, and the one listed in your plan affects the sort of home you can look for, including the SDA vacancies that will suit you. This guide breaks down each category in plain English, explains how the NDIS works out which one fits your needs, and looks at what that means for your SDA rent contribution and day to day life in your home. If you already know you need a high level of physical support, you can jump straight to our guide on High Physical Support SDA.
What is the SDA Design Standard?
The SDA Design Standard is the rulebook the NDIS uses for how Specialist Disability Accommodation is built. It sets out design elements like doorways, bathrooms, kitchens and emergency power, so a home built to a category actually works for the people who live there. Every new SDA dwelling has to be certified against the standard before it can be enrolled with the NDIS.
The standard groups housing into four design categories: Improved Liveability, Fully Accessible, Robust and High Physical Support. The category listed in your NDIS plan tells you and any SDA provider what kind of home you're funded to live in.
What are the four SDA design categories?
Each category matches a different level of need. Improved Liveability suits people who need better physical access plus support for sensory, intellectual or cognitive disability. Fully Accessible suits people with significant physical disability who need full wheelchair access. Robust suits people whose behaviour could damage a standard home, so the building needs to be tough and easy to fix. High Physical Support suits people with the highest physical and medical support needs.
The category isn't about how many support hours you get. It's about the physical building. Your day to day support, like personal care or supervision, is usually funded separately, for example through Supported Independent Living (SIL), on top of the home itself.
What does Improved Liveability mean?
Improved Liveability is the entry level SDA design category. It gives you a reasonable level of physical access, along with extra features for people with sensory, intellectual or cognitive disability.
In practice this can mean things like clear sightlines so a support worker can see you from other rooms, flooring and wall finishes that are easy to tell apart, and fittings that are simple to use. It's often suited to people who don't need full wheelchair access but do need a home that supports their cognitive or sensory needs.
What's the difference between Fully Accessible and Robust design?
Fully Accessible housing gives a high level of physical access for people with significant physical disability. Think wider doorways and hallways, flat, step free flooring, and open plan living so you can move around comfortably, including by wheelchair.
Robust housing is built differently. It uses strong, durable materials and fittings that hold up to heavy use, so the home needs less reactive maintenance and is safer for the participant and the people around them. It's aimed at people whose behaviour could otherwise put themselves, others or the building at risk.
What does High Physical Support include?
High Physical Support is for people with the most significant physical and medical support needs. It includes everything in Fully Accessible housing, plus extra features like ceiling hoists, backup power in case of an outage, and home automation or communication technology.
Because of the extra building work and equipment involved, High Physical Support homes generally attract the highest SDA payments. Read our full guide to High Physical Support SDA for more on eligibility and features.
How does the NDIS decide which category you need?
The NDIS looks at evidence about your current situation, including your strengths, the barriers you face and your day to day support needs. This is usually worked through with your NDIS planner alongside reports from allied health professionals, such as an occupational therapist.
The NDIS also considers whether your needs are likely to change in the near future, for example if your disability is progressive or you're getting older. That's one reason it helps to have a good OT report and to be clear about your goals when SDA is discussed in your planning meeting.
Can your SDA design category change?
Your design category is tied to your NDIS plan, not fixed to you forever. If your support needs change significantly, you can ask for your plan to be reviewed, and the NDIS may update your SDA category based on new evidence.
This isn't automatic and it isn't quick. If you think your current home no longer matches your needs, talk to your support coordinator or Local Area Coordinator about what evidence you'll need to request a change.
How do design categories affect finding SDA in South Australia?
Not every design category has the same number of homes available, and this varies by state and region. In South Australia, availability can be tighter for some categories and locations than others, so it helps to know your exact category and preferred building type before you start looking.
Once you know your category, you can start looking at SDA vacancies that match it. It's also worth checking how SDA rent contributions work, since this is a cost you pay on top of your NDIS-funded SDA payment.
Common questions
Can I live in a home that's a higher design category than what's in my plan?
Generally no. Your NDIS plan lists the SDA design category you're funded for, and that's the category of home your SDA payment applies to. Talk to your planner if you think you need a different category.
Do I need an OT report to get an SDA design category?
Not always, but it helps a lot. The NDIS uses whatever evidence is available about your functional impairment and support needs, and a report from an occupational therapist or other allied health professional is one of the strongest ways to support your case.
Is Robust design only for people with behaviours of concern?
Robust design is aimed at participants whose behaviour could put themselves, others or the building at risk. It's assessed on your individual support needs, not applied automatically because of any particular diagnosis.
Does a higher support design category mean I pay more rent?
Design category mainly affects the NDIS SDA payment made to your provider. Your own rent contribution works differently, see our guide on SDA rent contributions for how that's worked out.
Can two people with different SDA design categories share a home?
It depends on the property. Some SDA homes are built to a single design category throughout, while others are fitted out to support residents with different needs across shared and private spaces. Check with the specific provider and your support coordinator about what's available.
This article is general information only. It doesn't replace advice from the NDIS, your planner or a qualified professional. The NDIS makes all decisions about your funding and SDA design category, and NDIS rules can change over time. Find My SDA does not build or convert properties to SDA standard.