Residential Performance Solution Documentation

A successful thermal model comparison is an important part of a VURB assessment. But the modelling result must also be supported by documentation that explains how the proposed design demonstrates compliance.

Verification Using a Reference Building (VURB) is a technical assessment method that can be used within an NCC Performance Solution where the relevant provisions apply. Understanding the difference between a VURB modelling report and the broader Performance Solution documentation helps architects, builders and approval teams coordinate the evidence needed for a residential project.

Residential Performance Verification

An unfavourable reference building comparison does not necessarily mean a residential design must be abandoned. It means the proposed building has not yet demonstrated compliance through the selected verification method.

When a Verification Using a Reference Building (VURB) assessment does not satisfy the applicable heating or cooling load criteria, the next step is to understand the result before deciding how to respond. This may involve checking modelling inputs, reviewing the proposed specifications, considering design refinements or evaluating another appropriate compliance pathway.

Residential Design Coordination

Residential designs continue to evolve after energy modelling begins. The important question is whether a change affects the assumptions or performance demonstrated by the assessment.

During a Verification Using a Reference Building (VURB) assessment, changes to architectural drawings, glazing specifications, insulation, shading or other building characteristics may affect the thermal comparison. Understanding when a revision needs review helps project teams maintain consistency between the model, compliance evidence and final construction documentation.

Residential Glazing and Solar Design

Glazing and shading decisions influence more than the appearance of a home. They shape how solar heat enters, how heat escapes and how the building responds to seasonal conditions.

Under Verification Using a Reference Building, or VURB, these design characteristics contribute to the thermal comparison between a proposed dwelling and a compliant reference building. Understanding how they affect the model can help architects and project teams make more informed decisions before glazing and external shading specifications are finalised.

Residential Thermal Performance Modelling

A reference building comparison is only meaningful when the proposed dwelling and its benchmark are assessed under consistent conditions.

Verification Using a Reference Building, or VURB, compares the calculated heating and cooling loads of a proposed residential building with those of a compliant reference building. Under NCC 2022 H6V2, the required comparison depends on the climate zone, the modelling method and the prescribed assumptions used for both buildings.

NCC Jurisdictional Requirements

A compliance method included in the National Construction Code is not necessarily available for every residential project in Australia.

Verification Using a Reference Building, commonly known as VURB, is identified under NCC 2022 Volume Two as a method of verifying residential thermal performance. Its application, however, depends on the NCC edition, building classification and state or territory provisions governing the project.