Performance Solution Versus Deemed-to-Satisfy

Sydney Access Consultants · Updated October 2026

A performance solution versus deemed-to-satisfy decision can determine whether an access issue becomes a manageable design exercise or an expensive late-stage redesign. For architects, developers and certifiers, the question is not simply which pathway is easier. It is which pathway can demonstrate compliance with the National Construction Code (NCC), support equitable access and remain practical to construct, operate and maintain.

The Deemed-to-Satisfy pathway provides certainty through prescribed provisions. A Performance Solution can provide flexibility where those provisions do not suit the project, but only when it is supported by a clear and credible compliance case. Neither option should be selected by default.

Performance solution versus deemed-to-satisfy

The NCC allows a building solution to comply through a Deemed-to-Satisfy (DTS) Solution, a Performance Solution, or a combination of both. This framework applies across NCC requirements, including those affecting access for people with disability.

A DTS Solution follows the specific provisions set out in the NCC and referenced standards. In an access context, this may include the required dimensions, gradients, circulation spaces, door clearances, sanitary facilities, signage and paths of travel prescribed by the relevant clauses and standards. Where the design meets each applicable provision, the pathway is relatively straightforward to document and assess.

A Performance Solution takes a different route. Rather than following every prescribed DTS provision, the project team demonstrates that the proposed design meets the relevant NCC Performance Requirements. The solution must be assessed using one or more NCC assessment methods, such as evidence of suitability, verification methods, expert judgement or comparison with DTS provisions.

This does not mean a Performance Solution is a concession. It is a compliance pathway with a higher evidentiary burden. A design that is smaller, steeper, narrower or otherwise different from DTS provisions is not automatically acceptable because the site is constrained or the project budget is tight. The proposal must show how the intended level of performance will be achieved in practice.

When the DTS pathway is the right choice

For new buildings with adequate site area, conventional layouts and standard construction methods, DTS compliance is often the most efficient approach. It gives the wider project team a common reference point, reduces uncertainty during certification and helps contractors understand what must be delivered on site.

DTS is particularly valuable where the access strategy involves familiar elements: an accessible path from the boundary or parking area, compliant entries, circulation routes, accessible sanitary facilities and common areas. It is also generally preferable where a project has limited time for specialist analysis or where a variation offers little meaningful benefit.

The apparent simplicity of DTS should not be mistaken for a tick-box exercise. Access provisions interact with structural design, fire safety, hydraulic layouts, door hardware, furniture zones, landscape levels and tenancy fitout. A compliant dimension on a drawing can still fail operationally if a door swing obstructs circulation, a threshold is poorly detailed, or a ramp landing is compromised by drainage.

Early access review is therefore valuable even on a wholly DTS project. It identifies coordination issues before documentation is locked in and avoids treating accessibility as a late compliance overlay.

When a Performance Solution may be justified

A Performance Solution is most useful when strict DTS compliance creates a genuine conflict with the building, site or intended use. Existing and heritage buildings are common examples. A narrow entry, significant level change, constrained structural grid or protected fabric may make a conventional DTS upgrade impractical or disproportionately disruptive.

It can also assist on complex refurbishment projects, transport environments, irregular public spaces and developments where a different design response can achieve a comparable or better access outcome. For example, an alternative entry arrangement may improve arrival, wayfinding and independent use more effectively than forcing a technically compliant but remote or inconvenient route.

The key question is not, ‘Can we avoid this DTS clause?’ It is, ‘How will people with disability safely, independently and equitably use this part of the building?’ A sound Performance Solution begins with the users, the building function and the applicable Performance Requirements, then tests whether the alternative response achieves the required outcome.

There are circumstances where a Performance Solution should not be pursued. If the variation is intended only to recover floor area, reduce construction cost or preserve a preferred layout without addressing user outcomes, the compliance argument is unlikely to be persuasive. The cost and time involved in preparing evidence may also exceed the benefit of redesigning to meet DTS provisions.

Evidence is what separates a solution from an assertion

A defensible access Performance Solution needs a structured process. The exact scope depends on the project, but it generally starts by identifying the relevant NCC Performance Requirements and the DTS provisions from which the design departs. The project team must then establish the performance criteria against which the proposal will be assessed.

The assessment should consider the whole user journey, not an isolated dimension. This may include arrival and parking, path of travel, entry, vertical circulation, doors, amenities, internal circulation, communication and egress. It should also account for different user needs, including people who use mobility aids, have sensory disability, limited dexterity or reduced stamina.

Evidence may include measured existing conditions, architectural drawings, access analysis, user-focused scenarios, comparative assessment against DTS outcomes, product information and specialist expert judgement. The evidence must be proportionate to the departure and sufficiently clear for the relevant decision-makers to understand the limitations, assumptions and proposed safeguards.

Consultation is also critical. The building surveyor or certifier should be engaged early, not presented with a completed argument after the design has been finalised. Depending on the project, other stakeholders may include the client, fire engineer, heritage adviser, authority representatives, facilities team and disability access specialists. Early alignment reduces the risk of a technically detailed solution being rejected because its assessment approach was not agreed.

Performance Solutions need buildable safeguards

Many access Performance Solutions fail not because the underlying idea is poor, but because the documentation leaves too much to interpretation. If the outcome depends on particular door hardware, visual contrast, wayfinding, management procedures, staff assistance or operational controls, those measures need to be stated precisely and incorporated into the project documentation.

Operational measures require particular care. They can support a physical design response, but they rarely replace the need for independent access. A staff member may be unavailable, a key may be misplaced, a portable ramp may not be deployed, or a nominated accessible route may be blocked by deliveries. The more a proposal relies on management, the stronger the evidence and accountability arrangements must be.

Construction verification is equally important. Small site variations can undermine an access outcome: an altered gradient, additional floor finish, incorrectly located handrail or reduced latch-side clearance can change how a space works. Clear drawings, schedules, specifications and inspection points help preserve the design intent through procurement and construction.

NCC compliance is not the whole access conversation

Meeting the NCC is essential, but it does not automatically resolve all disability access obligations or guarantee an inclusive experience. The Disability Discrimination Act 1992 operates separately from the NCC, and a building that satisfies a minimum technical provision can still present barriers in use.

For this reason, the strongest projects consider compliance as the baseline rather than the finish line. A well-designed access strategy looks at dignity, choice, intuitive wayfinding, equitable amenity and the ability to participate without needing special assistance. These outcomes often improve usability for a much wider group of people, including older visitors, parents with prams and people recovering from injury.

This broader perspective does not require over-designing every project. It requires informed decisions about where an investment in inclusive design creates material value, reduces future retrofit risk and improves the experience of the building for its intended users.

Choosing the right pathway early

The best time to assess a performance solution versus deemed-to-satisfy approach is during feasibility or concept design, when circulation, levels, structure and building form can still change. Leaving the question until a certification review often narrows the available options and makes every response more costly.

Sydney Access Consultants assists project teams to test access pathways early, identify the relevant NCC requirements and develop project-ready documentation for practical, equitable outcomes. Whether DTS provisions are readily achievable or a Performance Solution is warranted, the goal is the same: a compliance strategy that stands up to scrutiny and works for the people who use the place.

When a design constraint emerges, treat it as a prompt for early specialist advice rather than a problem to be explained away at the end of the project. That is when compliance, buildability and inclusive design have the best chance to work together.