SDA Design Standard certification: provisional design vs final as-built

For new-build Specialist Disability Accommodation enrolment, the NDIS requires Design Standard certification by an accredited third-party SDA assessor at design stage and again when the dwelling is built. This page maps both stages, the independence rule, what the assessor lodges with the NDIA, and what only the registered provider can enrol. Gary Finn of Sydney Access Consultants is listed on the official NDIS find-an-assessor register as SDA00039.

Why new-build SDA needs Design Standard certification

Dwelling enrolment applications for newly built SDA must include certification against the SDA Design Standard. Only an accredited SDA assessor can issue it. The NDIA does not engage assessors to certify dwellings. The developer, owner or provider engages them.

Certification tests the nominated design category or categories in the SDA Design Standard (Edition 1.1, the published Standard for post-1 July 2021 new builds): Improved Liveability, Robust, Fully Accessible and High Physical Support. Multi-category certification is possible where the documentation supports it. Each nominated category has to be shown on the drawings. Naming a category in a fee proposal is not the same as documenting it.

Certification is not enrolment. The NDIA decides enrolment after the registered SDA provider submits a completed application for a built dwelling. Assessor certification does not bind that decision.

Category definitions sit in the SDA Design Standards FAQ. This page owns the certification process, not a reprint of the Standard.

Two mandatory stages

Provisional (design) certification

Design-stage certification happens before construction starts. Plans and specifications must clearly show every applicable requirement of the nominated category. There are no concessions for documented non-compliances; construction tolerances can be allowed in the documentation. The certification is called provisional because the dwelling is not yet built. It gives providers more certainty that what they intend to build can meet the Standard. The assessor lodges the certification with the NDIA. The project may be recorded on the design-stage register.

Final as-built certification

After the dwelling is built, the assessor assesses the completed work on site against the Standard for the nominated category. Only a built dwelling can receive final certification suitable to support provider enrolment. Final as-built registration is generally not accepted unless design-stage certification documents were previously lodged with the NDIA.

Evidence the project team commonly supplies at as-built includes builder confirmations (for example slip resistance, wall reinforcement, resilient finishes and relevant services), emergency evacuation or retreat information where the category requires it, structural confirmation for ceiling-hoist readiness on High Physical Support, lift or electrician certificates where they apply, and occupation or completion evidence. That list is typical process, not a private SAC checklist.

Independence: who can and cannot certify

The assessor must be an accredited third party, not an employee, associate or otherwise contracted in a way that creates a conflict with the provider, developer or owner. Assessor guidance used across the industry is clear: an assessor cannot certify a project they (or the same firm) designed as architect or building designer, constructed as builder, or reviewed as BCA consultant or building certifier. One person in the firm designing and another certifying does not cure the conflict. Separate ABNs do not remove it. The assessor is the individual.

Engage the assessor early for design-stage work. Do not expect the project architect to certify their own design. Sydney Access Consultants can provide design advice and documentation support, or independent certification, on a given development. Not both on the same project. Design documentation support, when SAC is not the certifying assessor, sits on SDA architectural documentation.

What the assessor lodges with NDIA vs what the provider enrols

Documents the assessor issues and registers

On a successful assessment the assessor typically issues the applicant a Certificate of SDA Design Category Compliance and an Assessment Summary Form, and registers the assessment with the NDIA by lodging those documents plus the Assessment Checklist for each dwelling. That registration is required at both provisional and as-built stages. The current NDIA channel is the one published in NDIS assessor guidance at the time of lodgement.

Enrolment is the provider’s job

Only a registered SDA provider enrols a final as-built dwelling, through the my NDIS provider portal. The assessor does not enrol the dwelling. The provider still needs the rest of the mandatory enrolment pack and must meet the SDA Rules. Design Standard certification alone does not guarantee enrolment.

What to prepare, and when to engage

Engage an independent accredited assessor before construction for provisional certification. Keep an independent assessor path clear through as-built. Drawings and specifications must explicitly show every applicable Design Standard requirement for the nominated category or categories: circulation, sanitary layouts, kitchen clearances, parking, structural allowance for hoists where High Physical Support is nominated, and Robust detailing where that category is nominated. Tell the assessor if the design changes after provisional certification. A mid-build change that is not re-assessed is a common reason as-built certification is delayed.

If the brief mixes SDA with livable housing or AS 4299, start with SDA vs livable vs adaptable.

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Boundaries

SDA Design Standard certification is an NDIS enrolment product. It is not a substitute for a disability access report lodged with council or a certifier under the Premises Standards and NCC access provisions. Many projects need both.

It is also not a Livable Housing (LHA or LHDS) assessment. New-build SDA uses the SDA Design Standard. See Livable Housing assessments and Adaptable Housing (AS 4299) when those controls sit on a different brief.

How Sydney Access Consultants delivers

Gary Finn is an accredited SDA assessor, number SDA00039, listed on the NDIS find-an-assessor page under Sydney Access Consultants. The practice prepares design-stage (provisional) and final as-built assessments against the SDA Design Standard for nominated categories, and lodges certification documents with the NDIA as part of the assessor role.

GJ Finn & DW Wong trading as Sydney Access Consultants work from Hurstville for metropolitan Sydney. On the Mid North Coast, Sandy Grey works from Black Beach. Accredited assessors listed by state on the NDIS register are not restricted to that region. In Perth and Western Australia the same national Design Standard applies; independence and the two-stage process do not change. See locations.

Frequently asked questions

Do I need both provisional and as-built SDA certification?

For newly built dwellings seeking SDA enrolment under the Design Standard pathway, yes. Provisional certification is before construction. Final as-built certification is after the dwelling is built. Final as-built registration is generally not accepted unless design-stage documents were previously lodged with the NDIA.

Can our project architect certify the SDA Design Standard compliance?

No, not if they designed the project or are otherwise conflicted. NDIS requires an accredited third-party assessor independent of the provider, developer and owner.

Does Design Standard certification mean NDIA will enrol the dwelling?

No. Certification supports the provider’s enrolment application. Enrolment is a separate NDIA decision.

What does the assessor lodge with NDIA, and what do we enrol ourselves?

The assessor lodges the Certificate, Assessment Summary Form and Assessment Checklist at both stages. Only the registered SDA provider enrols the built dwelling through the my NDIS provider portal.