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 Green Star Technical Clarification Rulings

Technical Clarifications for Green Star represent our answers to Technical Questions submitted by projects, and provide further guidance and reference to others. The list is regularly updated.  

There are two types of Technical Clarifications listed in the table below:

General Clarifications

These are extensions to the guidance provided in the Submission Guidelines. They clarify and sometimes supersede the original Credit Criteria or 
Compliance Requirements. General Clarifications set precedent for future project teams to follow. Should a project team wish to apply a general clarification to its project, there is no requirement for further Technical Questions to be submitted. NZGBC Assessors will also use them as precedents to assess submissions.

Project Specific Clarifications

These are published as references for other projects but, unlike General Clarifications, they do not set precedent. They often relate to special 
situations where multiple prerequisites exist for a particular project and are less likely to reoccur to another project. Therefore, rulings set for Project Specific Clarifications are often conditional and will likely vary for other projects. Each project still needs to submit its own Technical Questions and provides evidence relating to its own building in order to have a similar ruling approved for that specific building. 

Should you wish to apply any Technical Clarification for legacy rating tools to your projects, please submit a Technical Question to the NZGBC to 
explain why and how it applies. You can download the Technical Question form here

How to most efficiently use this page:

  1. Filter for the relevant tool version
  2. If known, use the credit name field to search for credit keywords or corresponding credit number - please note, this field will ONLY search the "Credit Name" field
  3. Use your CTRL+F to search keywords on the page
Technical Question Title Clarification Type Tool Version Month Released Credit Name Sub-credit Name Amendment/Approved Ruling
In lieu of a 'make good' lease clause General DABv1 November 2020 5 - Commitment to Performance End-of-life Waste Performance

In lieu of a 'make good' lease clause between the building owner and the tenant(s), the project team may provide another suitable formal commitment that indicates the building owner will undertake those commitments and responsibilities. The formal commitment must be a separate legal agreement and/or a memorandum of understanding (MoU), and address all the credit compliance requirements.

Provision of Outdoor Air General DABv1 January 2021 9 - Indoor Air Quality Provision of Outdoor Air

Despite the difference between NZS4303:1990 and AS1668.4:2012 and the intentional preclusion of AS 1668.2 in New Zealand Building Code with regards to provision of outdoor air, Green Star still recognises both standards as valid references for calculating achievement of criteria 9.2 Provision of Outdoor Air. This is because Green Star rewards points for a rate 50% and 100% greater than the minimum required by these standards rather than policing on code compliance. Recognising both standards does not conflict with building code conformance however brings more flexibility to project teams. 

The responsibility for minimum code compliance rests with the designer and is governed by existing regulatory bodies, while the intent of the tool is to improve outdoor air rates over minimum requirements. 

In view of the above, we are clarifying that when the section for 9.2A Comparison to Industry Standards only refers to the AS 1668.2:2012, it should read “the recognised standards listed in 9.2.3”.    

 

DALI System General DABv1 November 2020 11 - Lighting Comfort Localised Lighting Control

A project team may target the credit criteria Localised Lighting Control for a base building targeting a Green Star - Design & As Built rating, by installing a DALI system within the base building, which can then be utilized by the tenant to deliver localized lighting control. Project teams must provide a Tenancy Fitout Guide (or similar) to the tenant, which contains relevant information about the DALI system.  

Offsetting Embodied Emissions General DABv1 August 2021 29 - Innovation Global Sustainability

Criteria:

3 innovation points can be awarded for projects offsetting the embodied emissions associated with the construction of the building.

To be eligible, projects must fulfil the following:

- The building’s upfront carbon emissions calculated from Modules A1 to A3 must be at least 10% less than those of a reference building

- All remaining emissions from Modules A1-A5 must be offset through verified offset schemes.

Note: These innovation points are awarded specifically for the offsetting element. Further reductions in upfront carbon emissions in addition to the 10% requirement should be demonstrated by submitting through the existing LCA credit in Design and As-Built.

 

Additional Guidance:

The building’s upfront carbon emissions reductions must occur through good design and material selection.

Carbon offsets purchased against the building’s upfront carbon emissions from construction cannot be used to show compliance against the 10% reduction compliance.

To demonstrate compliance, project teams should model the proposed and reference buildings following the methodology of the Life Cycle Assessments credit. Projects must document a reduction in upfront carbon according to the materials and products in the scope.

If a project team has completed a LCA in according with the LCA credit, results of the global warming potential impact from that assessment can be used to demonstrate compliance with this innovation.

All claims of carbon in products must be accompanied by 3rd party verified data, such as in Environmental Product Declarations (EPD)

A calculation of upfront carbon emissions reduction should include but not limited to the following materials:

- Concrete (total)

-   Steel, structural and reinforcement

- Structural timber and frames

- Internal and external glass and glazing, including framing.

- Façade materials and cladding

- Masonry (brickwork and blockwork) and stone including grout;

- Pipes and conduits, including plastic and metal;

- Internal wall and ceiling lining including plasterboard, fibre-cement, timber cladding

- Roofing including tiles and sheet metal, and

- Floor coverings for example, carpets, ceramic tile and floor panels

Materials used in the calculator must capture at least 90% of physical materials and 90% of financial value of building products. Any materials not listed above that may be significant to the project’s upfront carbon emissions must be captured.

Demolition works are excluded from the calculation scope for the current stage.

 

Supporting Information:

Green Star Buildings (Australia): credit for Upfront Carbon Emissions

Green Star Design & As Built NZ v1.0: credit for Life Cycle Assessment

Default Service Life General DABv1, DABv1.1 May 2024 19 - Life Cycle Assessment/Impacts Comparative Life Cycle Assessment

The default service life in all LCA calculations is to be 50 years (not 60) to align with NZBC and the DAB v1.1.1 Submission Guideline. 

Amended Definition for Reference Projects General DABv1 December 2020 15 - Greenhouse Gas Emissions Greenhouse Gas Emissions

The definition for Reference Projects is amended as below:
A hypothetical building of the same size, shape and floor area as the Proposed Building, but whose building fabric and building services characteristics are based predominantly on the Deemed-to-Satisfy provisions as defined in this document.

AEM Producer Statement General DABv1 June 2022 14 - Thermal Comfort, 15 - Greenhouse Gas Emissions, 16 - Peak Electricity Demand Reduction Thermal Comfort, Greenhouse Gas Emissions, Peak Electricity Demand Reduction

Accredited Energy Modellers can use a producer statement instead of a full energy modelling report to demonstrate compliance for credit 14 Thermal Comfort,15 Greenhouse Gas Emissions and 16 Peak Electricity Demand Reduction. Note that the associated submission templates and Greenhouse Gas Emissions Calculator will still need to be submitted.

Sustainable Products Calculator to be used consistently regarding Labour General DABv1 October 2019 21 - Sustainable Products Sustainable Products

Costs entered into the Sustainable Products Calculator can either include or exclude labour and transport. However, this must be consistent for all costs entered. As such, all individual product costs, and the project’s PCV, will either include or exclude labour and transport costs.Where project teams are provided with some costs that include labour and transport, and some that exclude it, it is acceptable to choose one approach (i.e. include or exclude these costs) and then adjust the non-conforming figures accordingly.As an example, the product costs available to a project team for loose furniture and floor coverings excludes labour and transport, but all other product costs include it. In this case, the project team could make educated estimates for the labour and transport costs associated with the installation of loose furniture and floor coverings and add these costs to the original values provided. If this kind of adjustment is performed, please describe the methodology and justification for these calculations in the credit’s Submission Template.

Curtain instead of Blinds General DABv1, DABv1.1 March 2024 12 - Visual Comfort Glare reduction

If a curtain meets all the same requirements as what is required for blinds/screens in 12.1B, it would be deemed to comply 

Office Space Lighting General DABv1 November 2020 11 - Lighting Comfort Localised Lighting Control

The requirements of 11.4 may be achieved in the office spaces by providing a mixture of general non-dimmable ceiling lighting and local dimmable task lighting provided the task lighting is installed either as part of the base build or as part of an integrated fit-out.  The local dimmable lighting must also be able to be turned on or off as per the requirements of the 11.4 in the Submission Guidelines.  Where 11.2 is also being targeted then the requirements of 11.2 must be achieved alongside the recommendations for general and local lighting set out in AS1680.2.2-2008 Appendix E with the general lighting on and the local task lighting at its maximum illuminance. Note this applies to office spaces only