What Is a JV3 Assessment?
A JV3 assessment (formally known as Verification Method JV3) is an alternative compliance pathway under the National Construction Code (NCC) for demonstrating that a commercial building meets Section J energy efficiency requirements. Rather than checking each building element individually against prescriptive Deemed-to-Satisfy (DTS) provisions, JV3 uses whole-building thermal simulation modelling to compare the proposed building's annual energy consumption against a reference building.
The reference building is a hypothetical version of the same building that just meets DTS requirements. If the proposed design's modelled energy use is equal to or less than the reference building, the design is compliant. This performance-based approach allows architects and designers much greater flexibility in how they achieve compliance.
Through our referral service, we connect you with accredited energy consultants who use industry-standard simulation software such as IES VE, EnergyPlus, and TRNSYS to perform JV3 assessments for projects of all scales across Australia.
How Does JV3 Thermal Modelling Work?
JV3 thermal modelling involves creating a detailed digital model of the proposed building and simulating its energy performance over a full year using location-specific climate data. The modelling accounts for:
- Building orientation, form, and massing
- Thermal properties of the building envelope (walls, roof, floor, and glazing)
- Solar heat gains through windows and shading devices
- Internal heat loads from occupants, lighting, and equipment
- HVAC system type, efficiency, and operating schedules
- Ventilation rates and air infiltration
- Hot water systems and their energy consumption
An identical model is then created using DTS-compliant specifications to establish the reference building. The annual greenhouse gas emissions of both models are compared. If the proposed building produces fewer or equal emissions, it passes JV3 verification.
When Is JV3 Better Than Section J DTS?
While the DTS pathway under Section J is simpler and faster, there are many situations where JV3 verification is the better choice:
- High glazing ratios: Buildings with large glass facades often cannot meet DTS glazing requirements. JV3 allows trade-offs where high-performance glazing, shading, or efficient HVAC systems can compensate.
- Unique architectural designs: Non-standard building forms, atriums, double-skin facades, and other innovative design features are difficult to assess under rigid DTS rules.
- Cost optimisation: JV3 can sometimes identify less expensive compliance solutions by allowing trade-offs between building elements. For example, increased insulation in the roof may allow reduced glazing performance requirements.
- Heritage and adaptive reuse: Existing buildings undergoing change of use may have fixed elements (such as existing facades) that cannot be modified to meet DTS.
- Multi-storey mixed-use: Complex buildings with multiple occupancy types benefit from whole-building performance modelling.
The JV3 Assessment Process
When you engage an accredited consultant through our referral service, the JV3 assessment process typically follows these steps:
- Design review: The consultant reviews architectural drawings, mechanical specifications, and lighting layouts to understand the proposed design.
- Model creation: A detailed thermal model of the proposed building is created in simulation software.
- Reference building setup: A DTS-compliant reference model is established using the same geometry.
- Simulation: Both models are simulated using hourly climate data for the building's location over a full year.
- Results comparison: Annual greenhouse gas emissions are compared to determine compliance.
- Reporting: A detailed JV3 report is prepared documenting the methodology, inputs, results, and compliance outcome.
NCC 2022 and JV3 Updates
The NCC 2022 update introduced changes to both DTS and verification method requirements. Stricter performance benchmarks mean that more buildings now benefit from the JV3 pathway, as meeting DTS provisions has become more challenging and costly for certain building types. The accredited consultants in our network stay fully up to date with NCC amendments. Read our guide to NCC 2022 changes for a comprehensive overview.
Get Connected with a JV3 Assessment Specialist
JV3 assessments require specialist expertise in building physics and thermal simulation software. Through our referral service, we connect you with accredited consultants who have demonstrated experience delivering JV3 assessments for commercial projects across all Australian climate zones. Fill in the form to receive obligation-free quotes, or use our consultant finder tool to search by location.
You can also try our Section J cost estimator to get a ballpark figure for your project, whether you choose the DTS or JV3 pathway.