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NZ Green Building Council

Homestar and Greenstar is New Zealand's environmental and energy efficiency rating for both new and existing homes.  It's a voluntary rating system developed by BRANZ and the New Zealand Green Building Council (NZGBC).
The Homestar rating system scale goes from 1 (very poor) through to 10 (world class).  Points are awarded in nine credit categories, with the most important category being Energy, Health and Comfort.  High levels of insulation (ie: above the minimum Building Code requirements) using products such as Mammoth, will help homes achieve higher Homestar ratings.  All Mammoth products with Environmental Choice certification contribute to Homestar and Greenstar accreditation. 
Below are the Homestar and Greenstar accreditation tables: