Have you used EcoForm's free BAL Estimator, NaTHERS Star Estimator or Commercial Compliance Check?
Try the Calculator Now!This checker walks through the same fabric elements a certifier will assess, roof, walls, floor, and glazing, and compares your inputs against the actual Part J4 Deemed-to-Satisfy minimums for your building class and climate zone.
As you change each field, every row in the results panel updates instantly, so you can see exactly which element (if any) is falling short, and by how much, before committing to a spec.
Two items can’t be auto-checked here — the wall-glazing system U-Value and solar admittance need a Specification 37 façade calculation that accounts for glazing area, orientation and shading. We run these in a full Section J report. A Check tag means the same: a value to confirm, not a fail.
Copy your results and send them to us when you request a quote, so we know your indicative Section J results.
A planning-stage screen against the NCC 2025 Volume One Part J4 Deemed-to-Satisfy fabric provisions. The minimum R-Values and U-Values it tests against are taken directly from NCC 2025 Part J4. The Total R-Value shown for each construction option is an indicative typical value for that build-up, not an NCC figure, and your project’s actual value must be calculated to AS/NZS 4859.2 / Specification 37. The wall-glazing system U-Value and solar admittance require a full façade calculation. This tool is not a Section J report, JV3 verification or NABERS assessment, statutory compliance requires formal documentation by an accredited ESD consultant. EcoForm provides full Section J reporting, JV3 modelling and NABERS Commitment Agreements.
Two items in the results, the wall-glazing system U-Value and solar admittance, are marked "Calc" rather than pass/fail. These require a full Specification 37 façade calculation that accounts for glazing area, orientation, and shading in combination, which can't be reduced to a simple lookup. If your project fails one or more fabric elements, that doesn't mean the building can't proceed, a JV3 performance solution models the whole building's energy performance and can demonstrate equivalent compliance a different way, often without the cost of upgrading every individual element.
This tool is a planning-stage guide, not a certificate. EcoForm's Commercial Energy & ESD team prepares full Section J reports, JV3 performance modelling, and NABERS Commitment Agreements for commercial and multi-dwelling projects across WA, SA, NT, QLD, NSW, and VIC.
No. This is a planning-stage screen against the Part J4 Deemed-to-Satisfy minimums using typical construction values. A formal Section J report, JV3 verification, or NABERS assessment requires calculation to AS/NZS 4859.2 and Specification 37 by an accredited ESD consultant.
It doesn't mean the building can't proceed. You can either upgrade the failing element (better insulation, different glazing) or pursue a JV3 performance solution, which models the whole building's energy performance and can demonstrate equivalent compliance without every individual element meeting the deemed-to-satisfy minimum.
Those two figures depend on the interaction of glazing area, orientation, and shading across the whole façade, which requires a Specification 37 calculation rather than a simple lookup. We confirm both as part of a full Section J report.