BASIX Compliance Certificate
We connect you with accredited certifiers and assessors to verify your NSW building project meets its BASIX commitments. Required for both Construction Certificates and Occupation Certificates.
What Is a BASIX Compliance Certificate?
A BASIX Compliance Certificate is a formal document that confirms your completed building project has been constructed in accordance with the commitments made in the original BASIX Certificate. While the BASIX Certificate itself is obtained before construction (at the DA stage), the BASIX Compliance Certificate is required after construction to prove that all sustainability measures were actually implemented as promised.
This is a critical step in the NSW building approval process. Without a valid BASIX Compliance Certificate, your certifier cannot issue the Construction Certificate or Occupation Certificate, which means you cannot legally occupy or use the building.
How Is It Different from a BASIX Certificate?
Understanding the distinction between these two documents is essential for any NSW building project:
BASIX Certificate
- Obtained before construction
- Submitted with DA or CDC
- Sets sustainability commitments
- Based on proposed design
- Generated through BASIX online tool
BASIX Compliance Certificate
- Obtained after construction
- Required for CC and OC
- Verifies commitments were met
- Based on as-built conditions
- Issued by accredited certifier
When Is a BASIX Compliance Certificate Required?
BASIX Compliance Certificates are required at two key stages of the building process:
1. At Construction Certificate (CC) Stage
Before a Construction Certificate can be issued, the certifier must be satisfied that the detailed construction plans and specifications comply with the BASIX Certificate commitments. This means verifying that the specified insulation, glazing, water fixtures, energy systems, and other sustainability measures in the construction documentation match what was committed to in the BASIX Certificate. A BASIX compliance report or declaration confirming this alignment is typically required.
2. At Occupation Certificate (OC) Stage
Before an Occupation Certificate can be issued (allowing the building to be legally occupied), the certifier must verify that the completed building has been constructed in accordance with the BASIX commitments. This involves physical inspection and documentation review to confirm that all specified sustainability measures are installed and operational. This includes checking items such as:
- Insulation type and R-values match BASIX specifications
- Glazing type, frame material, and performance ratings are as specified
- Water-efficient fixtures (taps, showerheads, toilets) are installed with correct WELS ratings
- Rainwater tanks are installed with the specified capacity and connected to appropriate end uses
- Hot water systems match the type specified (e.g., heat pump, solar, gas instantaneous)
- Solar panels (if committed) are installed with correct capacity
- Lighting is energy-efficient as specified
The Compliance Verification Process
When you reach out through our service for BASIX compliance verification, here is the typical process:
- Submit your enquiry — provide your original BASIX Certificate number, project address, and current construction status
- Get matched — we connect you with an accredited certifier experienced in BASIX compliance verification
- Documentation review — the certifier reviews your BASIX Certificate commitments against construction documentation or as-built conditions
- Site inspection — for OC stage compliance, a physical inspection verifies installed measures
- Certificate issued — once compliance is confirmed, the BASIX Compliance Certificate is issued
What If Your Build Has Changed?
It is common for building designs to evolve during construction. If your as-built project differs from the original BASIX Certificate, you have two options:
- Amended BASIX Certificate — if changes are significant, a new BASIX assessment based on the as-built conditions may be required. This ensures the project still meets all BASIX targets with the modified design. We can connect you with an accredited assessor to prepare the amended certificate.
- Rectification works — if the changes result in non-compliance, you may need to undertake rectification works to bring the building back into compliance with the original commitments.
Related Pages
- BASIX Certificate — The pre-construction BASIX assessment
- BASIX Requirements — When BASIX applies and exemptions
- Find a Consultant — Search our network of accredited assessors
Frequently Asked Questions
A BASIX Certificate is obtained before construction begins and is submitted with your Development Application (DA). It sets the sustainability commitments for your project. A BASIX Compliance Certificate is issued after construction and verifies that the built project actually matches those original commitments. You need both — one to start building and one to finish.
BASIX Compliance Certificates are required at two stages: first, when applying for a Construction Certificate (CC) to confirm detailed plans comply with BASIX commitments; and second, when applying for an Occupation Certificate (OC) to confirm the completed building matches the BASIX Certificate. Both must be obtained before the relevant certificates can be issued.
A BASIX Compliance Certificate can be issued by an accredited certifier (either a council certifier or a private certifier). The certifier inspects the building and documentation to verify that all BASIX commitments have been implemented. We connect you with accredited professionals who can complete this process efficiently.
If your build deviates from the original BASIX Certificate commitments, you may need an amended BASIX Certificate that reflects the as-built conditions. This requires a new BASIX assessment based on the actual construction. If the changes still meet BASIX targets, a new certificate can be issued. If not, modifications to the building may be required before an Occupation Certificate can be granted.
BASIX Compliance Certificate costs are typically lower than the initial BASIX assessment, as the process involves verification rather than design. Expect to pay between $300-$800 depending on project size and complexity. This cost is often included as part of a broader building certification package.
Need BASIX Compliance Help?
Tell us about your project and we'll connect you with an accredited certifier to handle your BASIX compliance verification.