With the 2022 National Construction Code (NCC) update taking effect in Victoria as of May 2024, new homes in the state must now meet a higher minimum energy rating of 7 stars, up from 6, alongside new whole-of-home energy consumption requirements. This shift aims to create homes that are more comfortable, energy-efficient, and affordable to run.
Why Energy Efficiency Matters
Homes in Victoria are responsible for nearly 30% of electricity use and 22% of greenhouse gas emissions. The new standards aim to cut household energy bills and emissions while providing protection from extreme weather events. Since homes are long-term investments, designing for efficiency upfront is far easier and more cost-effective than retrofitting later.
Key Changes Under NCC2022
- 7-Star Energy Efficiency: The new 7-star minimum, rated by the Nationwide House Energy Rating Scheme (NatHERS), means homes will need 20-25% less energy for heating and cooling, enhancing thermal efficiency and lowering energy bills.
- Whole-of-Home Requirements: Homes now have an “energy budget” for heating, cooling, hot water, and lighting. This budget can be offset by efficient appliances or a rooftop solar (PV) system, promoting all-electric, low-energy homes.
- Accessible Design: New homes must also include universal design features for accessibility, supporting flexible use for all Australians.
The All-Electric Mandate
As of January 2024, new homes requiring a planning permit must be all-electric, meaning they must use electric heating, water heating, and cooking appliances. This step will prevent new gas connections, reducing both greenhouse gas emissions and household running costs.
Does 7-Stars Cost More?
Designing to meet the 7-star standard need not be expensive. Simple design choices, like optimising the home’s orientation for solar gain and including effective insulation and glazing, can help achieve the rating at a low cost. Builders are adjusting to these standards, with many embracing the shift as beneficial for both the environment and home comfort.
Looking Beyond 7-Stars
Some builders and homeowners are aiming even higher, designing homes that exceed 7 stars and are “net zero carbon” ready. These homes can include provisions for electric vehicles and advanced ventilation systems, providing comfort, efficiency, and sustainability into the future.