A revived 1970s commercial building is an energy-smart star

Aorangi house case study tile 634 x 587

Aorangi House was once tired and outdated but a green-principled refurbishment and fine-tuning have led to a top notch 5 star NABERSNZ rating.

Aorangi House case study [pdf 499 KB]


Situated at 85 Molesworth Street in downtown Wellington, 12-storey Aorangi House is a stylish, contemporary office block - its vibrant checkerboard exterior providing a strong visual statement in its commercial neighbourhood.

Built in 1970 the property had a strong presence for many years but over time its building fabric and internal systems became outmoded. A multi-million dollar overhaul in 2008 earned a 5 Green Star Design rating and positioned Aorangi House as a success story of rejuvenation, smart energy performance and low greenhouse gas emissions.


The owner and building manager Anaro Group is a commercial property investment and asset management company which administers 44 entities across New Zealand including bulk retail, industrial, warehousing and logistics, hotels and accommodation.

The company has embarked on a portfolio-wide review to ensure sustainability is a core value in its code of corporate social responsibility.

The consultants

Engineering and related services consultancy Beca is an employee-owned company with an Asian Pacific focus in the key hubs of New Zealand, Australia and Singapore. Beca uses the power of partnerships with its clients to think, design and develop creative solutions together. It encourages clients to aim high with sustainability aspirations and in response aims to deliver exemplar green outcomes.

Beca recently achieved a 4.5 star NABERSNZ ‘excellent’ tenancy rating at Aorangi House – gauging the energy use of office equipment and lighting over the nine floors it occupies.


  • 2010 – achieves 5 Green Star Design rating
  • 2016 – achieves a 5 star NABERSNZ base building rating
  • 2016 anchor tenant Beca – achieves a 4.5 star NABERSNZ tenancy rating
  • Total energy consumption 252,886 kWh/year
  • Energy performance is over 50 percent better than an average New Zealand office block

Related case studies

View more