BASIX benchmarks form part of the NSW planning system and are used to assess the environmental performance of residential developments across New South Wales.
The benchmarks establish minimum performance requirements relating to:
These requirements apply to many residential projects, including new homes, alterations and additions, duplexes and multi-dwelling developments.
Understanding how BASIX benchmarks operate early in the design process can help improve compliance outcomes, reduce redesigns and support more efficient building performance over time.
BASIX benchmarks are performance targets established under the NSW Building Sustainability Index (BASIX).
The benchmarks are used to evaluate whether a proposed residential development meets the required sustainability standards before approval can be issued through the NSW planning system.
Rather than focusing on a single design element, BASIX considers how different components of the home work together as part of the overall building performance.
This may include factors such as:
The required benchmark outcomes can vary depending on:
Water benchmarks are intended to reduce potable water consumption across residential developments in NSW.
The assessment may consider:
Water reduction targets differ across NSW climate regions and project types.
In many projects, early planning around rainwater storage, fixture selection and plumbing design can significantly improve BASIX water performance outcomes.
Energy benchmarks assess the projected energy performance of the proposed residential development.
This can include consideration of:
Energy performance is closely connected to passive design principles and thermal comfort outcomes.
Well-considered orientation, shading and building envelope design can often improve energy efficiency without relying solely on additional mechanical systems or higher-specification products.
Thermal comfort forms a major component of BASIX compliance for many residential developments in NSW.
The assessment evaluates how effectively the home maintains comfortable indoor temperatures throughout the year.
This may involve analysis of:
For many projects, thermal comfort compliance is assessed using NatHERS software.
NatHERS modelling provides a more detailed analysis of the home’s thermal performance across different climate conditions and seasons.
BASIX benchmarks are not identical across all projects or regions.
Requirements can vary depending on:
For example, homes located in warmer climate zones may face different thermal comfort and glazing considerations compared to projects in cooler regions of New South Wales.
Because of these variations, BASIX assessments are typically tailored to the specific project rather than applied as a fixed checklist.
BASIX and NatHERS often operate together as part of the residential approval process in NSW.
While BASIX establishes the broader sustainability framework, NatHERS is commonly used to assess the thermal comfort component of the development.
Using NatHERS modelling can provide greater flexibility when balancing:
This can often support more cost-effective and better-performing building designs compared to relying solely on simplified thermal assessment methods.
Some of the most common issues affecting BASIX benchmark performance include:
Addressing these issues earlier in the design phase can help avoid unnecessary redesigns and improve approval efficiency.
BASIX performance is often easier and more cost-effective to achieve when sustainability considerations are integrated early in the design process.
Coordination between:
can help support smoother approvals and stronger long-term building performance outcomes.
A BASIX benchmark is a sustainability performance target used to assess residential developments in NSW across areas such as water efficiency, energy use and thermal comfort.
Yes. BASIX requirements can vary depending on climate zone, project type and dwelling design.
Yes. NatHERS modelling is commonly used to assess the thermal comfort component of BASIX compliance.
Many alterations and additions in NSW require BASIX assessments where the value of works exceeds planning thresholds.
Yes. Orientation can significantly influence thermal comfort, glazing performance and overall energy efficiency outcomes.