BASIX Certificate NSW
A BASIX Certificate is mandatory for most residential projects in New South Wales. EcoMaxHomes prepares accurate, compliant BASIX Certificates for new homes, duplexes, granny flats, townhouses and apartments across NSW — with most standard certificates delivered within 24 to 48 hours.
What Is a BASIX Certificate?
A BASIX Certificate — Building Sustainability Index — is a NSW Government sustainability assessment required before development approval for most residential building projects. Without a valid BASIX Certificate, a Development Application (DA) or Complying Development Certificate (CDC) cannot proceed.
BASIX assesses three key sustainability areas:
- Water efficiency — fixtures, rainwater harvesting, irrigation and landscaping
- Energy efficiency — hot water, heating, cooling, lighting and appliances
- Thermal comfort — orientation, glazing, insulation, shading and ventilation
A BASIX Certificate confirms your project meets NSW sustainability targets and must be lodged with your DA or CDC documentation.
When Is a BASIX Certificate Required in NSW?
A BASIX Certificate NSW is required for:
- New homes — detached houses and custom builds
- Dual occupancy and duplex developments
- Townhouses and multi-residential buildings
- Granny flats and secondary dwellings
- Apartments and multi-dwelling developments
- Alterations and additions over $50,000
- Swimming pools and spas over 40,000 litres
If you are submitting a DA or CDC for any residential project in NSW, a BASIX Certificate is almost certainly required before approval.
What Does a BASIX Certificate Assess?
EcoMaxHomes reviews your architectural drawings and assesses your project across all three BASIX performance areas. Our assessment covers:
Water efficiency:
- Water-saving fixtures and fittings
- Rainwater tank size and connection
- Irrigation and landscaping commitments
- Pool and spa details where applicable
Energy efficiency:
- Hot water system type and efficiency rating
- Heating and cooling system selections
- Lighting — fixed and flexible
- Appliance assumptions
- On-site solar PV system where applicable
Thermal comfort:
- Building orientation and solar access
- Window size, placement and glazing performance
- External shading — eaves, awnings and balconies
- Insulation levels — roof, ceiling, wall and floor
- Roof colour and construction materials
- Natural ventilation and airflow
Our goal is always practical, cost-effective compliance — without unnecessary upgrades or added construction cost.
BASIX Certificate
for Different Project Types in NSW
BASIX Certificate for New Homes
All new detached houses and custom builds in NSW require a BASIX Certificate before a DA or CDC can be lodged. EcoMaxHomes prepares BASIX Certificates for new homes across all NSW climate zones.
BASIX Certificate for Granny Flats
Secondary dwellings and granny flats in NSW are subject to BASIX requirements. A valid BASIX Certificate must be obtained before development approval, regardless of whether the granny flat is attached or detached.
BASIX Certificate for Duplex and Dual Occupancy
Dual occupancy and duplex developments require a BASIX Certificate for each dwelling. EcoMaxHomes assesses both dwellings and prepares the complete BASIX documentation package.
BASIX Certificate for Townhouses and Apartments
Townhouse developments and apartment buildings require BASIX Certificates covering all dwellings. Our team manages multi-dwelling BASIX assessments efficiently, with fast turnaround suitable for DA and CDC submissions.
BASIX Certificate for Alterations and Additions
Alterations and additions over $50,000 in value are generally subject to BASIX requirements in NSW. EcoMaxHomes can confirm whether your renovation project requires a BASIX Certificate and prepare the documentation accordingly.
BASIX and NatHERS - How They Work Together in NSW
BASIX and NatHERS are both required for most new residential projects in NSW — but they serve different purposes.
BASIX is the broader NSW sustainability framework covering water efficiency, energy efficiency and thermal comfort.
NatHERS is the accredited thermal modelling pathway used to assess the thermal comfort component within BASIX. Under NCC 2022, most new homes must achieve a minimum 7-Star NatHERS rating as part of the BASIX process.
EcoMaxHomes provides both BASIX Certificates and NatHERS Assessments — one consultant, one process, no delays.
BASIX and Whole of Home NSW
For eligible NSW residential projects, Whole of Home requirements apply alongside BASIX. Whole of Home assesses the total annual energy use of the home — including fixed appliances and household energy systems beyond the thermal building envelope.
This covers heating and cooling equipment, hot water systems, lighting, cooking, pool and spa equipment, and on-site solar generation.
EcoMaxHomes provides Whole of Home Assessments for eligible projects alongside BASIX Certificates.
The BASIX Certificate Process - Step by Step
Step 1
Send Your Plans
Submit your floor plans, elevations, sections, window schedule, site plan and project details.
Step 2
Documentation Review
We confirm the project type, location, approval pathway and applicable BASIX targets for your NSW project.
Step 3
Sustainability Assessment
We assess water efficiency, energy efficiency and thermal comfort commitments against current NSW BASIX targets.
Step 4
Compliance Review
If the design meets all targets, we proceed to certificate preparation. If adjustments are needed, we identify practical solutions and recheck before issuing.
Step 5
BASIX Certificate Issued
Your BASIX Certificate is issued and ready for lodgement with your DA or CDC documentation package.
What Documents Are Needed for a BASIX Certificate?
To prepare your BASIX Certificate NSW, we typically need:
- Floor plans, elevations and sections
- Site plan showing orientation and lot boundaries
- Window and glazing schedule
- Wall, roof, ceiling and floor construction details
- Insulation specifications
- Shading details — eaves, awnings, balconies
- Hot water system type and efficiency rating
- Heating and cooling system selections
- Lighting and appliance details where applicable
- Rainwater tank details where applicable
- Solar PV system details where applicable
- Project address and dwelling type
You do not need every detail finalised before contacting us. Send what you have and we will confirm what is still needed.
BASIX Certificate Cost NSW
The cost of a BASIX Certificate in NSW depends on:
- Project type — new home, duplex, granny flat, apartment or renovation
- Number of dwellings being assessed
- Completeness of documentation provided
- Whether NatHERS thermal modelling is required alongside BASIX
EcoMaxHomes offers competitive, transparent BASIX Certificate pricing with no hidden costs.
Turnaround: 24 to 48 hours for most standard residential projects from receipt of complete documentation.
Frequently Asked Questions
What is a BASIX Certificate in NSW?
A BASIX Certificate is a mandatory NSW Government sustainability assessment required for most residential building projects. It confirms that the proposed development meets targets for water efficiency, energy efficiency and thermal comfort before a DA or CDC can be approved.
How much does a BASIX Certificate cost in NSW?
BASIX Certificate costs vary depending on project type, number of dwellings and documentation provided. Contact EcoMaxHomes for a quote based on your specific project.
How long does a BASIX Certificate take?
Most standard BASIX Certificates are prepared within 24 to 48 hours from receipt of complete documentation and project details.
Do granny flats need a BASIX Certificate in NSW?
Yes. Granny flats and secondary dwellings in NSW require a valid BASIX Certificate before development approval is granted.
What information is needed for a BASIX Certificate?
Floor plans, elevations, sections, site plan, window schedule, construction details, insulation specifications, hot water system type and project address. Contact us and we will confirm exactly what is needed for your project.
Do alterations and additions need a BASIX Certificate?
Alterations and additions over $50,000 are generally subject to BASIX requirements in NSW. Contact EcoMaxHomes to confirm whether your renovation requires a BASIX Certificate.
Do I need both BASIX and NatHERS in NSW?
For most new residential projects in NSW, yes. NatHERS is the thermal modelling pathway used to satisfy the thermal comfort component within BASIX. EcoMaxHomes provides both services.
What happens if my design does not meet BASIX targets?
EcoMaxHomes identifies which commitments are falling short and recommends practical, cost-effective design adjustments to achieve compliance without unnecessary construction costs.
What is the difference between BASIX and Whole of Home?
BASIX is the NSW planning sustainability framework covering water, energy and thermal comfort. Whole of Home is an additional assessment for eligible projects covering total annual household energy use including fixed appliances and energy systems.
Can I get a BASIX Certificate before my design is finalised?
Yes — and we recommend it. Early BASIX review identifies potential compliance issues before the design is locked in, reducing the risk of costly late changes.
Get Your BASIX Certificate NSW Quote Today
EcoMaxHomes prepares BASIX Certificates for residential projects across New South Wales — fast, accurate, and fully compliant with current NSW planning requirements.
24 to 48 hour turnaround. Transparent pricing. Direct access to your assessor.