- Site Analysis
- Site Use
- Passive Design
- Controlling temperature with passive design: an introduction
- Thermal simulation
- Location, orientation and layout
- Thermal mass
- Glazing and glazing units
- Controlling indoor air quality
- Controlling noise
- Climate change
- Passive House
- Material Use
- Wet Areas
- Health and Safety
- Other Resources
Designing the building and the spaces within it to benefit from natural light, ventilation and even temperatures.
Designing for climate change
Buildings should be designed and operated in such a way that they are responsible for fewer greenhouse gas emissions. They also need to be designed to cope with the impacts of climate change in coming decades.
On this page:
- designing to cope with climate change
- reducing greenhouse gas emissions
- BRANZ resources for climate-friendly designs
New Zealand houses have an average serviceable life of over 80 years, and some have lasted over 130 years. Buildings constructed today must therefore be able to deal with climate changes forecast for the long term. Houses will need to be designed to:
- respond appropriately to a changing climate with higher temperatures, different wind and rainfall patterns and potentially increased incidence of hazards such as flooding and storms
- minimise emissions of carbon dioxide and other greenhouse gases over their usable lives. Greenhouse gases contribute to climate change.
Buildings emit greenhouse gases in the materials and processes used in their construction, and – more significantly – in the energy and other resources used over the life of the building for heating, cooking and washing. Utilities such as electricity account for around a quarter of households’ average annual CO2 emissions. Good passive design can help to minimise energy use while maintaining a comfortable and healthy environment, so reducing greenhouse gas emissions. Installing high levels of thermal insulation and reducing volumes of waste are key measures.
Designing to cope with climate change
The impact of climate change will vary from region to region. Designers will need to consider:
- incorporating passive solar design features to reduce the need for heating in winter and air-conditioning in summer
- designing buildings with more shading in response to increased solar radiation
- increasing structural design to deal with increased wind loading
- designing buildings to make more use of natural ventilation
- designing the roof, roof drainage and stormwater run-off to cope with higher and more intense rainfall
- incorporating water-saving features in homes to reduce pressure on urban water supplies (see Water)
- potential flood risk in low-lying areas
- limiting building in flood-prone areas or coastal regions that are likely to experience increased erosion in the future.
Reducing greenhouse gas emissions
Carbon dioxide and other greenhouse gases are emitted through the process of building construction and use including during:
- material extraction, manufacture, processing and transportation
- occupation – a typical New Zealand home emits more than 3,000 kg of carbon dioxide every year)
Of these, the most significant is carbon dioxide emission through energy use. Limiting domestic greenhouse gas emissions is essential to reduce the impact on the environment as well as for economical reasons.
Greenhouse gas emissions can be reduced in a number of ways including:
- selecting a site that can take advantage of passive solar design
- designing an appropriately sized home i.e. if too large, materials and energy will be wasted
- incorporating passive design features such as orientation, insulation, and thermal mass to provide a comfortable internal environment while minimising energy use
- selecting materials with fewer emissions over their life cycle
- specifying energy-efficient lighting, heating, water heating and appliances
- incorporating rainwater collection and storage
- installing water-use reduction fittings.
BRANZ resources for climate-friendly designs
BRANZ is developing resources for designers wanting to produce homes with reduced carbon footprints. They include:
- BRANZ CO2NSTRUCT – provides an Excel spreadsheet with values for embodied greenhouse gas and energy for some construction materials.
- LCAQuick – also an Excel-based tool, this helps architects and designers evaluate the carbon footprint and other environmental impacts of a building design.
You can find a lot more information in the Environment and zero-carbon research section of the BRANZ website.
Updated: 12 February 2021