If your project does not meet BASIX requirements, it usually means the assessment cannot be finalised until something is adjusted. This does not necessarily mean the project is rejected or that the design cannot proceed. In most cases, the assessor needs to review the BASIX inputs, identify which target is not being met and work with the project team to find a practical way forward.
BASIX assesses water, energy use and thermal performance for residential development in NSW. The BASIX Tool calculates water and energy scores, where higher is better, and thermal comfort heating and cooling loads, where lower is better. If one part of the assessment does not meet the required target, the project may need changes to the design, building fabric, glazing, systems or commitments before a certificate can be issued.
If a project fails BASIX, the certificate usually cannot be finalised until the issue is resolved. The assessor will identify whether the problem relates to water, energy or thermal comfort and then recommend practical changes such as improved glazing, insulation, shading, hot water systems, rainwater tanks, fixtures or solar panels.
Not necessarily. In most situations, a project that does not initially meet BASIX requirements simply needs further review before the certificate can be completed. The assessment may show that the design needs stronger water savings, better energy performance or improved thermal comfort before the project can proceed through the approval pathway.
The important point is that the certificate should not be treated as separate from the design. BASIX commitments can affect real project decisions, including insulation, window performance, hot water systems, rainwater tanks, ventilation and other sustainability measures. If the assessment does not pass, those details may need to be adjusted and reflected in the plans or specifications.
BASIX has several performance areas. The main areas are water, energy and thermal comfort. A project may perform well in one area but not meet the required target in another. For example, a project may have strong water efficiency measures but still struggle with thermal comfort because of glazing, orientation, shading or insulation.
The best solution depends on where the shortfall occurs. A water target issue may be solved differently from an energy target issue. A thermal comfort issue may require changes to the building fabric or glazing strategy rather than simply adding another water or energy commitment.
A project can miss BASIX requirements for several reasons. Some are design related, some are documentation related and some are caused by unresolved system selections. Common issues include:
If the water target is not being met, the solution may involve reviewing fixtures, landscaping assumptions, rainwater tanks, pool details or other water related commitments. In some cases, a different rainwater tank size, improved water efficient fixtures or clearer outdoor water assumptions may help the project meet the BASIX requirement.
The right solution should be practical for the project. For example, a rainwater tank commitment should make sense for the site, plumbing design and construction documentation. A commitment that helps the certificate pass but does not suit the project can create problems later when the plans are reviewed or the building is constructed.
If the energy target is not being met, the assessor may review hot water systems, heating and cooling systems, ventilation, lighting, appliances and solar panel assumptions. Some projects may improve their BASIX outcome by selecting a more efficient hot water system, adding or adjusting solar panels or improving the efficiency of major energy systems.
Energy improvements should be coordinated with the project documentation. If the certificate relies on a particular system or commitment, that commitment may need to be shown or specified clearly enough so the approval and construction documentation remain consistent.
Thermal comfort issues often require more design coordination. The thermal performance section of BASIX is intended to support dwelling comfort, reduce greenhouse gas emissions from artificial heating and cooling and reduce peak energy demand. If the thermal comfort outcome is not meeting the requirement, the assessor may need to review the building fabric, windows, shading, roof form, insulation and ventilation strategy.
Possible thermal comfort improvements may include:
The best response depends on the project. Sometimes the issue can be resolved by adjusting commitments, such as fixtures, hot water, rainwater or solar. Other times, the building design itself may need review, especially if the problem relates to thermal comfort, glazing, orientation, shading or insulation.
A good BASIX solution should be realistic, buildable and aligned with the design intent. It should not create commitments that the builder, certifier or owner cannot reasonably deliver later. This is why early review is helpful. The earlier BASIX issues are identified, the easier it is to resolve them without disrupting the approval pathway.
Yes, it can delay lodgement if the BASIX Certificate is required and the assessment has not yet met the required targets. A BASIX Certificate is commonly submitted with the development application or complying development certificate documentation. If the certificate is not ready, the approval package may not be ready either.
This is why it is better to involve the assessor before the final deadline. If the project needs changes to pass BASIX, it is much easier to manage those changes before the application set is complete and before the design team is under pressure to lodge immediately.
Certified Energy prepares BASIX Certificates for residential projects across NSW, including new homes, alterations and additions, secondary dwellings, dual occupancies, townhouses and multi dwelling developments. If your project does not initially meet BASIX requirements, our team can review the assessment pathway and identify practical options for improving the result.
Where NatHERS thermal comfort modelling is required, we can coordinate the BASIX and NatHERS components together so the certificate, drawings and performance assumptions remain aligned before lodgement.
Send your available plans to Certified Energy and our team can review the project, identify likely BASIX issues and advise the next step toward certification.
Request a QuoteIf your project does not meet BASIX requirements, the certificate usually cannot be finalised until the issue is resolved. The assessor will identify whether the issue relates to water, energy or thermal comfort and recommend practical changes.
Yes. Many projects can be adjusted by improving glazing, insulation, shading, ventilation, hot water systems, rainwater commitments, water fixtures, solar panels or other design and system details.
Not necessarily. It usually means the BASIX assessment needs more work before the certificate can be issued. The design team may need to adjust commitments, drawings or specifications so the project can meet the required targets.
Common reasons include large unshaded glazing areas, poor orientation, insufficient insulation, inefficient hot water systems, missing rainwater tank commitments, high cooling loads, incomplete documentation or design assumptions that do not support the required BASIX targets.