Common questions, answered.

NatHERS (Nationwide House Energy Rating Scheme) is a star rating system that rates the energy efficiency of a home based on its design. The rating ranges from 0 to 10 stars, with higher ratings indicating better thermal performance. Most new homes in Australia are required to achieve a minimum 7-star NatHERS rating under the National Construction Code.

Under the NCC 2022 energy efficiency provisions, most new homes require a minimum 7-star NatHERS rating. However, requirements can vary by state and local council. Some developments and planning overlays may require higher ratings. Ace Energy can advise on the specific requirements for your project.

Ideally, as early as possible in the design process. Getting Ace Energy involved at the design stage means we can provide advice on orientation, glazing, and insulation before plans are finalised — saving you time and money on redesigns. However, we can assess plans at any stage.

We typically need architectural floor plans, elevations, a site plan showing orientation, and a window schedule or specification. Construction details showing insulation, wall systems, and glazing types are also helpful. Contact us with whatever you have and we will advise if anything else is needed.

A performance solution is an alternative compliance pathway under the NCC. When a building design does not comply with the deemed-to-satisfy provisions, a performance solution uses modelling and analysis to demonstrate that the building still meets or exceeds the energy performance requirements. This is common for architecturally unique homes with large areas of glazing or unconventional designs.

Section J of the National Construction Code covers energy efficiency requirements for commercial buildings and some residential developments. A Section J report assesses the building envelope, air-conditioning, ventilation, lighting, and hot water systems to demonstrate compliance with the NCC's energy efficiency provisions.

BASIX (Building Sustainability Index) is a NSW planning requirement that ensures new homes and major renovations meet targets for water, thermal comfort, and energy efficiency. A BASIX Certificate must be lodged with your development application or complying development certificate. Ace Energy assesses your plans, runs them through BASIX-accredited tools, and issues the certificate ready for submission.

Turnaround times depend on the complexity of the project and current workload. Standard NatHERS assessments are typically completed quickly once complete plans are received. More complex projects such as performance solutions or large Section J reports may take a little longer. A clear timeline is provided when plans are submitted.