Measuring our sustainability progress : New Zealand’s new detached residential housing stock (stage one)

There is a gap in understanding what the financial and sustainability value is to the developer, builder or home owner of various measures. Examples such as better-than-code insulation, double glazing, water conservation, solar water heating, air and water heat pumps, other heating, efficient lights and house orientation.
Lead organisation
BRANZ Limited
Focus area
Sustainability
Start date
Status
Complete
Last updated 23 Apr 2026
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About this programme

There is a gap in understanding what the financial and sustainability value is to the developer, builder or home owner of various measures. Examples such as better-than-code insulation, double glazing, water conservation, solar water heating, air and water heat pumps, other heating, efficient lights and house orientation. Questions are also being asked about the costs and benefits of making housing more resilient against, for example, floods, impact damage, or of using more durable materials with lower maintenance costs. There is a gap in understanding what value going ?beyond Code? could be delivering. This project was an important piece of the sustainability and resilience picture that was missing. Decisions are being made around different products and systems that may be sub-optimal or decisions are being made with poor understanding about the overall benefits that could accrue. This project provided an evidence base for improved decisions around investing in sustainability and resilience features. The final outcomes of this project aim to help builders, designers and specifiers to make better informed choices around the costs and benefits of these features for new and existing housing. This in turn supports optimal uptake of these features to deliver improved retrofit of existing stock as well as better informed decisions around features that can be included in new housing.