Specification TOOl

Masterspec is the leading specification system in New Zealand’s construction industry used by over 1250 design practices. MAXRaft specification is available online for Architects and Architectural Designers.


energy efficient building

Homestar is an independent rating tool that certifies the health, efficiency and sustainability of New Zealand homes.

A home is rated on a 1-10 scale: a rating of 1 Homestar means it needs significant work, and 10 Homestar indicates international best practice. Most existing New Zealand homes only achieve a 2-3 Homestar rating. A new home built only to Building Code would achieve 3-4 Homestar.


engineering specialists in low energy

eZED Consulting Engineers focus on low or zero energy projects.  eZED offers technical know how, industry experience and a professional service.

eZED work hard to make their details structurally thermal bridge free to maximise thermal efficiency.

They are an ideal partner should you be considering a formal certification program such as Passivhaus, Green Star or Homestar.



Warm and Cool helps people to build homes that are continually warm and healthy with low running costs. They ban winter from New Zealand homes!

Warm and Cool has over 26 year’s experience to draw on and they have installed over 1000 Water based central heating systems in Otago and Southland.