Performance Solution vs Deemed-to-Satisfy: Which Pathway Does Your Project Need?
Direct answer: A Deemed-to-Satisfy (DTS) solution follows the National Construction Code’s prescriptive rules exactly, while a Performance Solution demonstrates compliance with the same underlying Performance Requirements through an alternative, engineered approach. Most projects can meet the DTS provisions without issue. A Performance Solution is only needed where the DTS rules can’t be met, or where meeting them would compromise the design, budget, or site constraints; which is more common than most builders expect, especially on tight infill sites, adaptive reuse projects, and anything with an unusual layout.
Two Ways to Comply With the NCC
Every building in Australia has to satisfy the Performance Requirements set out in the National Construction Code. There are two accepted ways to prove that:
Deemed-to-Satisfy (DTS) – you follow the prescriptive provisions in the NCC exactly (specific fire ratings, specific travel distances, specific separation to boundaries). If you follow the rulebook to the letter, compliance is automatically accepted, no further justification required.
Performance Solution – instead of following the prescriptive rules, you (via a fire engineer) demonstrate that your design meets the same Performance Requirement through analysis, alternative measures, or a combination of both. This is sometimes still called an “Alternative Solution,” an older term from previous NCC editions that a lot of builders and certifiers still use interchangeably.
Neither pathway is “better” in the abstract; they’re both fully compliant, fully certifiable routes. The right one depends entirely on whether your design can satisfy the DTS provisions as drawn.
When DTS Is the Right Call
If your building can meet every relevant DTS clause without redesigning anything; standard boundary setbacks, standard fire separation, standard travel distances, there’s no reason to bring in a performance solution. It adds a step, a cost, and a timeframe that a straightforward compliant design simply doesn’t need. A good building designer or certifier will usually flag early on whether your plans sit comfortably within DTS or whether they’re going to trip a clause.
When You Need a Performance Solution
A Performance Solution becomes the right (and often only) path when:
- The site itself won’t allow DTS compliance. For example, a narrow infill lot where a wall can’t sit the prescribed distance from the boundary.
- The design intent conflicts with a prescriptive rule. An open-plan retail tenancy that can’t accommodate the DTS travel distance to an exit.
- A retrofit or change of use inherits a building that was never built to current DTS provisions, and bringing it fully up to DTS standard would mean substantial (and often unnecessary) demolition or rework.
- There’s no reticulated water supply, ruling out standard hydrant or sprinkler provisions as drawn.
- Cladding, construction type, or fire resistance levels don’t match what DTS specifies for that building’s use and rise.
In each of these cases, a Performance Solution isn’t a workaround. It’s the mechanism the NCC itself provides for exactly this situation. The Performance Requirements are the actual legal compliance target; DTS is just one accepted way of hitting them. A well-justified Performance Solution, supported by the right analysis and alternative fire safety measures, is engineered to meet that same target by a different route.
What a Performance Solution Actually Involves
At a minimum, a properly prepared Performance Solution report will:
1. Identify exactly which DTS provision can’t be met and which Performance Requirement it maps to.
2. Set out the fire engineering methodology used to demonstrate compliance (quantitative analysis, qualitative comparison, or a mix).
3. Recommend any additional or alternative fire safety measures needed to offset the departure from DTS.
4. Provide the documentation your certifier and, where relevant, the fire authority need to sign off.
Frequently Asked Questions
Is a performance solution less safe than a deemed-to-satisfy design?
No. Both pathways are required to meet the same NCC Performance Requirements. A performance solution simply demonstrates that compliance through engineering analysis and alternative measures rather than the prescriptive rulebook.
Can I choose a performance solution even if my design already meets DTS?
Yes, though it’s rarely worthwhile. If DTS compliance is achievable without redesign, it’s almost always the cheaper and faster route.
Who signs off on a performance solution?
A suitably qualified fire engineer prepares the report, and your building certifier reviews and accepts it as part of the overall building approval, sometimes in consultation with the relevant fire authority.
Does a performance solution need council approval?
It forms part of your building approval documentation reviewed by your certifier, not a separate council process, though certain fire-authority consultation may be required depending on the project.
Not sure which pathway your project falls into? Fyrewise offers free, no-obligation project reviews – call +61 492 943 682 or email admin@fyrewise.com.au and we’ll tell you plainly whether you need a performance solution before you spend anything on one.
