NSW Sustainability Compliance
BASIX Certificates
NSW Building Sustainability Index certificates · NatHERS thermal comfort · energy and water compliance
Ark Resources & BASIX
The Building Sustainability Index (BASIX) is the NSW Government's mandatory sustainability assessment tool for residential development applications. All new houses, townhouses, and apartment buildings in NSW must achieve minimum BASIX scores across energy, water, and thermal comfort before a Development Application (DA) can be lodged. Ark Resources is an accredited BASIX assessor with extensive experience delivering certificates for residential projects across Sydney and NSW.
BASIX uses a web-based tool to assess proposed dwellings against benchmarks for energy consumption, water use, and thermal performance. The thermal comfort component requires a NatHERS simulation (using AccuRate or FirstRate) to verify that the dwelling meets minimum star ratings. Ark Resources handles the full process — from initial feasibility through to BASIX certificate issue and commitment scheduling — ensuring a smooth DA lodgement for your project.
Our team understands the interaction between BASIX targets, NatHERS ratings, and good building design. We engage early with architects and developers to identify the most cost-effective pathway to compliance and to integrate sustainability commitments into the design rather than retrofitting them at the last minute.
BASIX (Building Sustainability Index) is a NSW Planning portal tool that assesses new and substantially renovated residential buildings against minimum sustainability targets. It covers three categories: Energy (reduced greenhouse gas emissions), Water (reduced potable water consumption), and Thermal Comfort (minimum NatHERS star rating). A BASIX Certificate must be submitted with any residential DA in NSW.
BASIX applies to all new dwellings in NSW including detached houses, townhouses, duplexes, and apartments (Class 1 and Class 2 buildings). It is administered by the NSW Department of Planning.
BASIX Services
BASIX FAQs
Is BASIX mandatory for all NSW residential projects?
Yes. A BASIX certificate is required for all new residential building work in NSW valued at $50,000 or more for alterations/additions, and all new dwellings regardless of value. It must be submitted with the Development Application.
What is the difference between BASIX and NatHERS?
BASIX is the overall NSW sustainability compliance framework covering energy, water and thermal comfort. NatHERS (the Nationwide House Energy Rating Scheme) is the thermal performance simulation used to satisfy the thermal comfort section of BASIX. All BASIX assessments for Class 1 and 2 buildings require a NatHERS simulation as part of the process. Ark Resources delivers both.
Does BASIX apply to apartment buildings?
Yes. Class 2 apartment buildings in NSW require BASIX assessment. For apartments, the assessment covers the whole building's energy and water systems as well as individual dwelling thermal comfort. Requirements for apartments differ from Class 1 dwellings and Ark Resources has extensive experience with both.
What happens if my design changes after the BASIX certificate is issued?
If design changes affect BASIX commitments (such as glazing area, insulation, or water fixtures), the certificate must be amended before construction. Ark Resources manages BASIX amendments efficiently and advises on whether proposed changes trigger re-assessment.
Can Ark Resources help with BASIX in addition to other NSW ESD requirements?
Yes. We regularly prepare BASIX and NatHERS reports together as part of a broader NSW compliance package. For larger developments, we can also assist with Section J (NCC commercial energy compliance), NABERS ratings, and Green Star certification across NSW.
Our BASIX Team
Our team delivers BASIX assessments and NatHERS thermal comfort reports for residential development applications across NSW. Get in touch to discuss your project.
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Need a BASIX certificate?
Ark Resources delivers BASIX assessments and NatHERS thermal comfort reports for residential development applications across NSW. Contact us to discuss your project.