A Basix report & certificate must be obtained with all new domestic homes and additions in the State of New South Wales, Australia.
Some advise……. (Builders and Owner builders) do not change the BASIX specifications and requirements as stated on your certificate and report when construction your building project. This advise is aimed mostly for owner builders who have decided that a “cheaper” product is available (example windows). A single 3mm standard glass in a standard aluminium frame is a lot cheaper than the BASIX requirement that states that a double glazing with gas in between the layers of glass in an improved aluminium, single pyrolytic low -e with an U-value: 4.48, SHGC: 0.46 specification window is specified. This window is specified in the BASIX report and certification (as an example).
If the standard window does not comply with the BASIX certificate and report, Council will ask the builder or owner-builder to replace the standard installed windows and replace them with the BASIX required windows. This will be an expensive exercise because not only will the cheaper windows be replaced but also the labour and the expense to modify the brickwork around the windows and timber frame will have to be adjusted to fit the specified windows. From experience, that has happened on site.
To obtain a Basix report and certificate the following items must be observed:
The Energy section of BASIX aims to reduce the greenhouse gas emissions of all new residential dwellings. The benchmark is 3,292 kilograms of carbon dioxide per person per year, which was the average for pre-BASIX homes.
The energy target ranges from 10% to 50% reductions from the benchmark, depending on the climatic zone and the building type. The BASIX targets are determined from data provided by state and federal energy and water utilities, as well as long-term climate data from the Bureau of Meteorology.
Energy consumption and savings will be assessed on:
- Hot water systems
- Heating and cooling
- Pools and spas
- Alternative energy sources
- Other energy uses Central systems
- Thermal comfort
The Thermal comfort section of BASIX aims to:
- ensure thermal comfort for a dwelling’s occupants, appropriate to the climate and season;
- reduce greenhouse gas emissions from artificial cooling and heating through good building design and use of appropriate construction materials; and
- reduce the demand for new, or upgraded, energy infrastructure by managing peak demand for energy required for cooling and heating.
The loads from Thermal comfort are combined with the selected heating and cooling appliances in the Energy section to calculate the cooling and heating component of your Energy score. Lower loads will improve your Energy score. In cold or hot climates, you may find this is an effective way of obtaining a Pass in Energy.
The Water section of BASIX aims to reduce the potable water consumption of all new residential developments. The benchmark is 90,340 litres of water per person per year (or 247 litres per person per day), which was the average potable water consumption of a pre-BASIX home.
The water reduction target ranges from 40% to 0% depending on the climatic zone. The 40% reduction target applies to 90% of new residential development and 98% of high-growth areas.
The BASIX targets are determined from data provided by state and federal energy and water utilities, as well as long-term climate data from the Bureau of Meteorology.
For more information on NSW Basix report and certificates see: www.planningportal.nsw.gov.au/planning-tools/basix