Green Star

The New Zealand Green Building Council (NZGBC), established by the NZ Government in 2005, is a not-for-profit, industry organisation committed to progressing the development and use of green building practices.

NZGBC is committed to setting standards of best practice and leadership through the development of environmental tools for buildings in New Zealand.

Green Star is a comprehensive, national, voluntary environmental rating scheme that evaluates the environmental attributes of New Zealand's buildings using a suite of rating toolkits developed to be applicable to different building types and function.

The tools are developed by the NZGBC in partnership with the building industry to:

  • Establish a common language and standard of measurement for green buildings
  • Promote integrated, whole-building design
  • Raise awareness of green building benefits
  • Recognise environmental leadership
  • Reduce the environmental impact of development.

The Green Star suite of rating tools was designed to match the key phases in a commercial office building life cycle

The current tools assess the environmental impact that is a direct consequence of a building's site selection, design, construction, and maintenance.

The framework has eight separate environmental impact categories plus an innovation category.

Credits are awarded within each of the categories based on the building's environmental merits in a range of areas and they take into consideration the unique development requirements and impacts of each sector.

Points are then weighted and an overall score is calculated, determining the project's Green Star rating.

Possible Ratings

  • 4 Star Green Star Certified Rating (score 45-59) signifies 'Best Practice'
  • 5 Star Green Star Certified Rating (score 60-74) signifies 'New Zealand Excellence'
  • 6 Star Green Star Certified Rating (score 75-100) signifies 'World Leadership'


The NZGBC Green Star scheme for rating commercial office buildings allocates a total of three points for the use of concrete in a building. There are two routes to obtain these points:

Environmental Choice Route

In New Zealand, Environmental Choice New Zealand (ECNZ) is the official environmental label. The scheme operates separately from the government but the label is government owned and endorsed.

In a rigorous assessment, an independent third party verifies all information and licence holders are monitored to ensure continued compliance with standards.

One, two or three points can be awarded if it is demonstrated 30%, 60% or 90% respectively of the new concrete used in the building is independently verified to have a lower environmental impact than standard concrete.

Concrete conforming to the Environmental Choice Ready Mixed Concrete specification is an approved product.

The ECNZ specification for Ready Mixed Concrete EC43-10 requires that the cement used meets the requirements of the ECNZ specification EC-42-10 for Portland Cement and Portland Cement Blends.

Golden Bay Cement is the only cement supplier in NZ to be awarded a license to use the Environmental Choice Eco label for our EverStar – Certified product.

Alternative Route

Two points can be awarded if the concrete used in the building contains 20% recycled aggregate and an additional one point can be awarded by replacing 20% of cement for insitu concrete or 15% of cement for precast concrete with a mineral addition, an industrial waste by-product or a pozzolanic material.

Golden Bay Cement can supply our EverPlus Class C Fly Ash that meets these requirements for cement replacement.