Tasmania returned to NCC 2022 on 5 June 2026 and adopts NCC 2025 on 1 May 2027. This guide covers its condensation variation, how Section J applies, and what changes in 2027. Checked 1 November 2026.
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NCC 2025 applied in Tasmania from 1 May to 4 June 2026. The Building Amendment Act 2026 then paused it: NCC 2022 applies again from 5 June 2026 and stays in effect until 1 May 2027, when Tasmania adopts NCC 2025 (ABCB adoption information; Building Standards Tasmania).
If your project was approved under NCC 2025 between 1 May and 4 June 2026, ask your building surveyor which edition it must be completed to. Building Standards Tasmania notes that transitional arrangements apply, and section 11(5) of the Building Act 2016 sets out exemptions from a newly adopted Code in some cases.
Tasmania replaces the national F8P1 with its own wording: in a sole-occupancy unit of a Class 2 building or a Class 4 part, risks from water vapour and condensation must be managed to minimise their impact on occupants' health (NCC 2022 Volume One, Tasmania appendix).
The TAS F8P1 notes refer designers to the Condensation in Buildings Tasmanian Designers' Guide, published by CBOS, to be read with the NCC. The notes say its strategies exceed the NCC requirements but are strongly recommended for cool climates like Tasmania.
Under NCC 2022 F8D3, a pliable building membrane, sarking-type material or insulation layer on the exterior side of the primary insulation must have a vapour permeance of at least 0.143 µg/N.s in climate zones 4 and 5, and 1.14 µg/N.s in climate zones 6, 7 and 8. From 1 May 2027, NCC 2025 Table F8D3 applies, and a drained and ventilated cavity must be provided in climate zones 6, 7 and 8, subject to the exclusions in F8D3(5).
Instead of the Deemed-to-Satisfy rules, a Performance Solution can use the F8V1 Verification Method: modelling to AIRAH DA07 must show that a mould index greater than 3 does not occur on the interior surface of the water control layer or on the building fabric inside it.
Until 1 May 2027, NCC 2022 Section J applies in Tasmania to Class 3 and Class 5 to 9 buildings. Tasmania lists no variation to NCC 2022 J1P1 for these classes, so the national energy caps apply: 80 kJ/m².hr for Class 6, 43 kJ/m².hr for Class 5, 7b, 8 and 9a (other than ward areas) and Class 9b schools, and 15 kJ/m².hr for other classes. For Class 2 buildings and Class 4 parts, Tasmania's NCC 2022 variation applies Section J of BCA 2019 Amendment 1.
When NCC 2025 is adopted, Tasmania's variations keep older Section J editions. Tasmania applies Section J of BCA 2019 Amendment 1 to Class 2 buildings and Class 4 parts, and Section J of NCC 2022 Amendment 2 to all other classes (NCC 2025 Volume One, Part J1 notes). So the NCC 2025 Section J caps and J1V3 test are not expected to apply in Tasmania. Your building surveyor confirms the edition.
Wall and roof checks against F8D3 and the Tasmanian Designers' Guide strategies, with clear fixes for the details that fail.
Mould index modelling for wall and roof assemblies that don't fit the Deemed-to-Satisfy rules.
Deemed-to-Satisfy reports and J1V3 modelling to the Section J edition that applies in Tasmania.
Sustainability reports for planning and design, scoped to the project.
We confirm the building class, approval date and the edition your building surveyor is working to.
We check the wall and roof build-ups and the Section J inputs against the rules that apply.
We run the Deemed-to-Satisfy checks, F8V1 or J1V3 models and prepare the report.
We answer building surveyor queries and update the report if the design changes, within the agreed scope.
Timing: Timeframes confirmed at quote; fast-track available for urgent projects.
NCC 2022. Tasmania applied NCC 2025 from 1 May to 4 June 2026, then reinstated NCC 2022 from 5 June 2026 until 1 May 2027 (ABCB adoption information; Building Standards Tasmania).
Industry reports of CBOS advice say a project approved under NCC 2025 stays on NCC 2025, but we have not found this in a published CBOS page. Your building surveyor confirms the edition for your project.
The TAS F8P1 notes say the CBOS Condensation in Buildings Tasmanian Designers' Guide must be read with the NCC, and that its strategies exceed the NCC requirements but are strongly recommended. We check details against both.
NCC 2025 Table F8D3 sets vapour permeance ranges by climate zone and wall type, and requires a drained and ventilated cavity in climate zones 6, 7 and 8. In Tasmania it applies from 1 May 2027.
Tasmania's NCC 2025 variations apply Section J of BCA 2019 Amendment 1 to Class 2 buildings and Class 4 parts, and Section J of NCC 2022 Amendment 2 to all other classes.
Yes. We use the F8V1 Verification Method, which checks the mould index on the water control layer and the fabric inside it.
Yes. We're based in Melbourne and work on projects Australia-wide, using the NCC edition and Tasmanian variations that apply.
Timeframes are confirmed at quote, and fast-track is available for urgent projects.
We check the wall and roof details for condensation risk and Section J in the same review.
We cite the Tasmanian clauses and the edition your building surveyor is working to.
Our founder, Kelvin Mureithi: Green Star Accredited Professional, ISAP and Engineers Australia member.
We are based in Melbourne and work with design teams Australia-wide.
Reviewed by Kelvin Mureithi, Founder, Makao · Green Star Accredited Professional, ISAP, Engineers Australia member. Rules checked against ABCB and state government sources on 1 November 2026.
