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AENEC BASIX Residential Properties

BASIX - NatHERS - Section J Reports

BASIX, NatHERS, Section J reports by Australia's #1 trusted source since 2010.

NatHERS & BASIX Certificates and Section J reports for residential and commercial properties.

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BASIX Certificates NatHERS - NSW


Adoption of NCC 2022 begins 

The National Construction Code (NCC) 2022 commenced on 1 May 2023, with the new energy efficiency requirements optional until 1 October 2023. 

Please note the requirements and adoption dates will vary depending on your state or territory. Victoria, Queensland, the ACT and NSW (using enhanced BASIX certificate) are currently expected to introduce the new 7-star minimum and Whole of Home energy budget from 1 October 2023. 

For more information on the adoption dates and requirements of each jurisdiction see the Australian Building Codes Board (ABCB) website.  

What exactly is a BASIX certificate ?

The Building Sustainability Index (BASIX) aims to deliver reductions (savings) and effective use of water and energy, to residential buildings across NSW.

It also aims toward the reduction of greenhouse gas emissions reductions across the state which are derived from greenhouse gas emissions from residential buildings by setting maximum heating and cooling loads within the NatHERS component. The BASIX online tool is one of the strongest sustainable planning measures to be undertaken in Australia.​

In October the 1st 2023 BASIX will be under even more stringent new specifications.​

BASIX Certificate, NatHERS Assessments Reports & Consulting in Sydney and NSW

AENEC offers extensive expertise in BASIX assessments and certification of houses and apartments in Sydney and throughout NSW. Building Sustainability Index, BASIX aims to improve energy efficiency and reduce water consumption in Sydney. BASIX certificates are required for new houses, multiunit buildings, and most modifications and additions. The certificate is filed in the context of an innovation request. AENEC is a skilled BASIX assessor with extensive experience in reporting.

BASIX Assessment

A BASIX certificate assessment is needed during the development applications process in NSW and takes into account various criteria including: Location of the building, Location size and type of building. The study also included the comfort of the temperature and the efficiency of cooling and heating of homes to a comfortable level. The homeowner also has the opportunity to help improve sustainability through reduced water and electricity costs. A BASIX is assessed online using the BASIX' sustainability and energy efficient assessment and environmental impact assessment and tool. The tool checks all the elements of a proposed design against sustainability and energy targets. BASIX reduces the water consumption, greenhouse gas emissions thus energy consumption in homes across NSW. These environmental outcomes also provide a long term financial saving for the homeowner – and a valuable contribution to the sustainable future of our communities.

BASIX Energy Assessments are a HERA approved assessor

We are responsible for preparing your BASIX certification.

(Building Sustainability Index) BASIX & THE PLANNING SYSTEM

An integrated part of the planning system, online BASIX assessment tool is implemented under the Environmental Planning and Assessment Act. the the BASIX assessment tool applies to all residential developments and dwelling types and is part of the whole development consent and application process in NSW.​


That is why you need to use our professional service. As we do BASIX assessments, and BASIX certificates day in and day out, we have all the required experience and we will ensure that you will not be out of pocket with unnecessary provisions and technical solutions. 

What does this mean for the new developments?

  • Basically, the building must be able to perform better both in summer and winter in order to meet minimum requirements

  • Window areas may need to be reduced in comparison the old standards

  • Window specifications may need to be increased and sometimes significantly to meet new standards

  • Higher levels of insulation may need to be added

  • Higher thermal mass can be considered

  • Higher build costs all up

  • Better homes to live in

  • Much lower running cost of the buildings

  • More environmentally friendly buildings

If you are about to start designing your new project, look for;

  • Orientation and sun exposure are two very important factors, so where possible use them ti benefit your outcomes

  • Build as close to the square shape as possible. Long and narrow buildings tend to suffer either in summer or winter and in some cases throughout the year

  • Limit as much as possible glazing areas

  • Utilize openable windows rather than fixed where possible

  • Keep an open mind for color tone scheme as they play an important role too 

BASIX - New Homes & Apartment Buildings - NSW

All new houses and apartment buildings are required to have a BASIX certificate being completed as part of development applications. The BASIX certificate, online assessment tool that has three segments:

  • The Water Efficiency component

  • The Thermal Comfort component

  • The Energy Efficiency component


Nominally a reduction of water consumption by a minimum of 40% compared to a standard house (house without any other water consumption saving measures) for new houses/townhouses and by 30% compared to a standard apartment for apartments. The water usage reduction for apartments, sometimes is also at 40% depending on suburb, size of development, etc.  

Water efficiency is primarily achieved via the use of rated water appliances (shower heads, taps, cisterns), the more water and energy efficient utilization of rainwater tanks for garden watering usage and sometimes for laundry, and toilets as well as in swimming pools, whenever applicable.


NatHERS is a national scheme although not compulsory to all states, however is compulsory in NSW. It is a scheme where dwellings are rated according to their thermal performance for summer and winter. That is achieved via the simulation of the proposed dwelling by specialty software packages such as Firstrate and HERO. The way this is done is the whole geometry of the subject building, including neighboring residential buildings, for shading, location, orientation and building constructions are inputted. All of the above are calculated thus predicting cooling and heating loads. the BASIX tool has benchmarks for these loads mainly dependent on location and building type, however other secondary parameters are taken into consideration.

Once the software produces the predicted loads, they then are compared to BASIX benchmarks. If loads are higher than allowed, mainly construction specifications (walls types, insulation levels, window types, colours etc) are altered / optimized in order to make the dwelling comply.​

Single dwellings can also be assessed via the online tool by use of the simple method, a method that can be assessed by anyone however be careful on the commitments as they will be checked by the accredited certifier and non-compliance, will need to be addressed.​


Similarly to the water efficiency section, electric appliances such as water heaters, a/c, lights, and other, sometimes including solar photo-voltaic systems are specified in order to achieve 30% - 40% energy usage reduction compared to a standard dwelling. Thermal comfort section can affect the energy efficiency and thermal comfort performance such as a well existing dwelling, since a well performing dwelling requires less water and energy demands little on no a/c usage, thus contributing positively to this section.​

All of the above is combined in one document, the so called BASIX certificate and is used as a specification sheet for architects and builders for the development application process building phase under national construction code and as a checklist for building certifiers at the completion stage final inspection of the project in order for the development application, certificate and the Occupation Certificate to be issued.​

All information outlined in the the BASIX certificate and in the HSTAR universal certificate (thermal comfort section) must be reflected 100% in the building and construction certificate.

In other states, BASIX is not applicable and reference solely to the BCA is taken into account, however for thermal the comfort, NatHERS is the only scheme available 

To address the whole thermal performance and comfort section of your BASIX requirements, AENEC provide their clients a thermal simulation by using the latest software packages and is able to provide you with complete and accurate design advice. 

AENEC also specializes in multi-unit residential project and BASIX certifications for apartment buildings and having assessed many residential buildings and multi-unit projects we have an extensive knowledge of the process. 

For our multi-unit fee schedule, please contact us.

BASIX Legislation

Planning in NSW is largely governed by the following two pieces of legislation:

  • Environmental Planning and Assessment Act 1979 (or “the EP&A Act”), and the

  • Environmental Planning and Assessment Regulation 2000 (or “the EP&A Regulation”). 

While the Act and the Regulation provide the overarching structure for planning and development application in NSW, there are a number of other statutory documents that support that structure. 

The two most commonly used are State Environmental Planning Policies (SEPPs) and Local Environmental Plans (LEPs).​

  • State Environmental Planning Policies (SEPPs).

There are approximately 66 State policies and that outline the NSW Government's approach to dealing with planning issues specific to the State and people of NSW. State policies are made by the Governor on the recommendations of the Minister for Planning and updated as required.​

  • Local Environmental Plans (LEPs).

Each local government area has a LEP to guide development and protect natural resources such as waterways and heritage within local government areas. LEPs are prepared by councils, in consultation with their community and approved by the Minister for Planning (or their delegate). 

Although the rules and guidelines for land use within council areas are dictated to some degree by State Environmental Planning Policies, councils can administer more specific rules about land use through their Local Environmental Plans, and can provide additional guidance in their development control plans (DCPs).

What does a BASIX Certificate Cost?

The the fees for the BASIX certificate cost for each new project is determined when we see the plans. The scope of producing a BASIX Certificate are based upon the design and the complexity of the design. NatHERS is used in many projects to reduce compliance costs. Once the construction plans are approved, one of our consultants will create a quotation for you to submit. The following pricing covers most projects and includes no GST. Get in touch for a quote on what BASIX certification.

When is more than one BASIX Compliance Report required?

A regulatory requirement for BASIX certification is stated in EPA regulation. If building projects involve many dwellings, or residential flat buildings, then separate BASIX certification must accompany each dwelling for the development application. Subdiviging the land into single “TORREN’S title” lots.. If you are planning to subdivide the land into separate dwellings without sharing properties, you may use either one of two methods: Staged developments Occasionally developments might need splitting in sections for management purposes.

Subdivision into single 'Torrens title' lots

Where the development includes land subdivisions and the building of detached single dwellings (class 1-buildings) on these lots without sharing common property, the application must be accompanied by a single BASIX certified property based certificate. A single BASIX certificate is possible by using the BASIX Multiple-House Tool for each dwelling. For larger divisions this reduces certificate pages by putting all separate BASIX certificate commitments on each property in tables.

NSW BASIX Checklist

NSW BASIX checklist offers a complete checklist for BASIX evaluation. Note that you may ignore the section which does not apply. In some situations if you don't own a dam, you could ignore it. Send us an email to request for the BASIX Checklist.

Development involving strata title

Development of apartment flats for homes or apartments on shared land should be accompanied by a single registration document – for the entire building. It permits the proper distribution of water and energy needs due either to the common property or central services and allows for a smoother management. Exceptions are made in certain larger development projects that require staging or phase construction.

What is the BASIX NSW Assessment Criteria?

Developing applications need BASAX Certifications to validate their development applications. The BASIX NSW Certification reveals that your next building project complies with government sustainable goals.

Water Targets

It aims to limit water usage in new housing projects. Often regions will need lower scores.

What are the BASIX Report Targets?

A BASIX program requires meeting water, heating, comfort and energy targets. To obtain the certification it is necessary to pass all sections of the test. The passing scores in each section are calculated by comparing their performances to the average house built during the period before BASIX was introduced.

How is the BASIX certificate assessed?

In addition you may use online tools to test BASIX certification to evaluate its long-lasting development capabilities. It analyses data for the proposed dwellings design against the water and energy targets in NSW. Once the BASIX targets are met and paid, it will provide an official certificate.

What about alterations and additions?

BASIX is applicable to any modifications or additions in Sydney whose total capacity is at least $50000 or more and / or include the installation of pool or spas greater than 40 000 litres. Using efficiencies, the BASIX tool is working towards decreasing possible water usage. The changes section in the BASIX assessment tool.

Am I locked into my BASIX commitments once a construction or complying development certificate has been issued?

Effectively, yes. The applicant who wants to modify the BASIX commitments after obtaining a the BASIX certificate required for construction will need the a revised BASIX Certificate (and NatHERS when there has been a NatHERS Assessment) and apply for the new construction or compliance certificate.

Thermal Comfort Targets

Thermal Comfort section is meant to ensure homes maintain comfort in the room temperatures. This will reduce CO2 and carbon emissions from artificial air conditioning, heat and air conditioning. This section should be improved using passive design, using improved materials or selecting the right compliance route. To finish this part the following compliance methods must be followed to complete: Do-it-Yourself (DIY) method Suitable for all people and is inexpensive. It is constructed of common construction materials that provide pass or fail results without examining design elements.

NatHERS for thermal comfort

if any of the following conditions exist, then a NatHERS assessment is needed.

The DIY method can only be used if:

  • the conditioned floor area is not more than 300 square metres

  • the dwelling is either single or double storey

  • the dwelling must not contain open mezzanine area exceeding 25 square metres

  • the dwelling must not contain third level habitable attic room

  • the glazing area is between 10% and 40% of the conditioned floor area

  • there are no more than 40 windows and glazed doors in the dwelling (combining windows of the same orientation is not allowed)

  • the total area of skylights is not more than 3 square metres.

Water and energy Scores

The energy and water score represents the expected water and energy consumption for the project compared to consumption in comparable benchmark dwellings prior to the implementation of the BBSIX requirements in 2004. A house with a potable water consumption score above 40% will mean it uses 40% less water than a similar house. These figures are set to be updated as of October 1st 2023.

What is the purpose of BASIX certificates?

This BASIX certification aims at providing NSW homes with more resilient homes, while simultaneously reducing greenhouse gas emissions and water usage. BASIX was created to reduce water consumption as well reduce greenhouse gas emissions such as carbon dioxide emissions by 25%.

How do I get a BASIX certificate?

The BASIX certificate can be obtained by using the BASIX assessment tool on the website. Normally the builder will handle that. When a proposal is submitted to get one BASIX certificate with a fee paid, an electronic certificate becomes a pdf file.

Can I do my own BASIX certificate?

Make an online BASIX Assessment. It's available for anyone. Free download. Once each section is passed, the certificate is generated. There will be charges for generating certificates. Print a BASEX certificate: if you create a valid BASEX Certificate, you are committed to the construction of the work described here.

Who prepares a BASIX?

BASIX certificates are available for those who lack qualifications and experience. It includes water commitments. The Thermal Efficiency Certification (NatHERS) for thermal comfort is accompanied by a NatHERS certified assessor in the section.

We hope that this short article has been useful and if you like to find out more, you can contact us as or look at the quick cost guide page

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AENEC, is an Australian company servicing the building sustainability industry and BCA compliance since 2010. In addition to serving a variety of clients, including small architectural firms, builders, and larger architectural firms, we also work with prime building developer companies.

We take care of the  the whole process of BASIX certification; including preliminary design advice when required, full calculations for thermal comfort requirements using the latest software packages and techniques available, we provide expert advice for the right combinations in order to achieve BASIX and NatHERS compliance. So far we have a 100% success rate in terms of council submissions.

In order to obtain your BASIX Certificate, you must meet minimum performance standards by using the most economical materials and components in terms of thermal performance. When needed, we will recommend adjustments of materials / components in order to achieve the desirable results for you.

AENEC will provide you the best available advice for BASIX commitments as well as NatHERS and will optimize the design of your new dream home, by using the latest available engineering techniques and industry standards. At AENEC we understand that the commitments on BASIX certifications can be costly, so we will act on your behalf in order to achieve optimum results.

In order to obtain the BASIX Certificate Cost and find out more about what is a BASIX Certificate, and a BASIX Compliance Certificate NSW, please contact us.

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The quality of consultation is guaranteed and you will receive the best value for you hard earned money. Building costs will be kept to minimum requirements, maximum performance or anything in between. 

To provide you with all of the above we incorporate the latest developments in the building industry through membership, accreditation and CPD programs. We are fully insured for a complete piece of mind.

​“AENEC is passionate about the environment and the reason for its foundation was this. What we really thrive on, is to provide the best possible service for your project in regards to the energy efficient design and technologies without compromising the overall design and the project’s budget.”

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