What Does a Building Certifier Do in NSW?
If you’re planning a build, renovation, or demolition in New South Wales, you’ll need a building certifier. But most people have no idea what a certifier actually does, how they differ from council, or when to appoint one. This guide explains the role in plain English so you know exactly what to expect.
What This Guide Covers
The role of a building certifier in NSW, the certificates they issue, the inspections they conduct, how to appoint one, and how they’re regulated. If you’re starting a residential or commercial project, this is the foundation you need.
What is a building certifier in NSW?
A building certifier is an accredited professional who ensures building work complies with the National Construction Code (NCC), relevant Australian Standards, and NSW planning legislation. They are independent of both the builder and the council. Their job is to protect you, the property owner, by verifying that the work meets the standards required by law.
In NSW, building certifiers are registered under the Building and Development Certifiers Act 2018 and regulated by Building Commission NSW. They must hold professional indemnity insurance and are subject to regular audits. A certifier who fails to comply with their obligations faces fines of up to $110,000 for companies or $22,000 for individuals (Building and Development Certifiers Act 2018, Sections 91-92).
The older term “Principal Certifying Authority” (PCA) has been replaced by “Principal Certifier” (PC) under current legislation. If you see either term, they refer to the same role.
Importantly, a building certifier is not a building surveyor (a term used in other states), not your builder’s employee, and not part of council. They are an independent professional appointed to oversee compliance on your project.
What does a building certifier actually do on a project?
A building certifier performs three core functions: assessing plans, conducting inspections, and issuing certificates. These functions apply from the moment you’re ready to start building until the day you move in.
Plan assessment and certificate issuance
Before construction can begin, the certifier reviews your building plans and specifications against the NCC, any relevant Australian Standards (such as AS 2870 for residential slabs and footings), and the conditions of your development consent. If the plans comply, the certifier issues a Construction Certificate (CC), which authorises building work to commence. For eligible projects, the certifier may issue a Complying Development Certificate (CDC), which combines planning and construction approval into a single certificate.
Mandatory inspections during construction
Once construction begins, the certifier (acting as Principal Certifier) conducts or supervises the mandatory critical stage inspections. For houses, granny flats, and similar Class 1 and 10 buildings, there are six mandatory inspections required under the EP&A (Development Certification and Fire Safety) Regulation 2021, Section 61:
- After excavation and prior to placement of footings
- Prior to pouring any in-situ reinforced concrete building element
- Prior to covering the framework for any floor, wall, roof, or other building element
- Prior to covering waterproofing in any wet areas
- Prior to covering any stormwater drainage connections
- After building work is completed and prior to any Occupation Certificate being issued (the final inspection)
These are the minimum required inspections. A Principal Certifier may require additional inspections depending on the project’s complexity and site conditions.
Why in-person inspections matter
The certifier should attend every mandatory inspection in person, not rely on photos sent by the builder. Photo-based inspections cannot verify what’s behind a wall, under a slab, or beneath waterproofing membrane. If problems are missed at these stages, they become hidden defects that surface months or years later. Building defects cost NSW an estimated $700 million per year (Money magazine, 2025). A significant portion of that cost stems from issues that should have been caught during inspection.
Final sign-off
When construction is complete, the certifier conducts the final critical stage inspection and, if everything complies, issues an Occupation Certificate (OC). The OC confirms the building is safe, compliant, and suitable for occupation. You generally cannot legally occupy or use a new building without one.
What is the difference between a building certifier and council?
Both private building certifiers and council certifiers have identical legal authority under the Environmental Planning and Assessment Act 1979 (NSW). Both can issue Construction Certificates, Complying Development Certificates, and Occupation Certificates. Both can act as Principal Certifier.
The difference is operational. A private certifier works directly with you as an independent business. They set their own schedule, manage their own workload, and communicate with you directly. A council certifier operates within the council’s administrative systems, serves all council applications in queue order, and communicates through council channels.
In practice, this means private certifiers are generally faster, more accessible, and more flexible with scheduling. It’s also worth noting that not all NSW councils still offer certification services. Some have withdrawn entirely, referring applicants to private certifiers.
For a detailed comparison, see our guide to private certifier vs council certifier in NSW.
What certificates does a building certifier issue?
A building certifier in NSW can issue four main types of certificates, depending on the project and pathway:
Construction Certificate (CC)
Confirms that proposed building plans and specifications comply with the NCC, relevant standards, and conditions of development consent. A CC must be issued before building work can lawfully begin after a Development Application (DA) has been approved by council. Learn more about Construction Certificates.
Complying Development Certificate (CDC)
A fast-tracked approval that combines planning permission and construction approval into a single certificate. Available for eligible developments that meet the standards set out in the SEPP (Exempt and Complying Development Codes) 2008. CDCs are typically determined within 10 business days. Learn more about CDCs.
Occupation Certificate (OC)
Issued after the final inspection confirms the completed building is safe, compliant, and fit for occupation. An OC is generally required before you can legally move in or use the building. Learn more about Occupation Certificates.
Subdivision Certificate
Required for subdivision works (e.g. creating new lots). Confirms that the subdivision complies with the conditions of consent and relevant standards.
How do you appoint a building certifier in NSW?
You appoint a building certifier by lodging the appointment through the NSW Planning Portal. The Principal Certifier must be appointed before any building work commences. This is a legal requirement under the Environmental Planning and Assessment Act 1979.
Here is the typical process:
- Choose your certifier. Research and select a registered certifier. Check their registration on the Building Commission NSW website. Ask about their inspection approach, fees, and availability. For guidance, see our guide to choosing a building certifier in Sydney.
- Get a quote. Request an itemised fee proposal that shows exactly what is included: plan assessment, all mandatory inspections, certificate issuance, and any additional services. The only standard additional cost should be the NSW Planning Portal lodgement fee of $47 per application.
- Sign the engagement. Once you’ve agreed on scope and fees, the certifier will provide an engagement letter or contract confirming the terms.
- Lodge the appointment. The certifier (or you, depending on the arrangement) lodges the Principal Certifier appointment via the NSW Planning Portal. This must happen before building work starts.
- Submit your application. Lodge your CC or CDC application through the portal along with all required documentation (plans, specifications, engineering reports, BASIX certificate if applicable, soil classification report, and any other supporting documents).
One important point: the choice of certifier is yours. Under NSW legislation, your builder cannot appoint the certifier on your behalf without your consent, and no builder should pressure you into using a specific certifier. The certifier works for you, the property owner, not for the builder. This independence is fundamental to the integrity of the certification process.
How is a building certifier regulated in NSW?
Building certifiers in NSW are regulated by Building Commission NSW under the Building and Development Certifiers Act 2018. The regulatory framework includes several layers of oversight:
Registration and accreditation
All certifiers must be registered with Building Commission NSW. Registration requires appropriate qualifications, experience, and professional indemnity insurance. The register is publicly accessible, so you can verify any certifier’s credentials before appointing them.
Auditing
Building Commission NSW conducts risk-based audits of certifiers under Section 106 of the BD&C Act. In 2025, Building Commission inspectors visited over 850 building sites across NSW (Building Commission NSW, 2025). Certifiers who obstruct audits or fail to produce records face penalties of up to $110,000 for companies or $22,000 for individuals.
Reporting requirements
From 1 July 2025, certifiers must report certification data via the NSW Planning Portal, increasing transparency and enabling the regulator to identify patterns of non-compliance across the industry.
Complaints and disciplinary action
If a certifier acts improperly, complaints can be lodged with Building Commission NSW. Outcomes can include formal warnings, conditions on registration, suspension, or cancellation of registration. The system is designed to hold certifiers accountable and protect consumers.
When do you need a building certifier for your project?
You need a building certifier any time your project requires a Construction Certificate, Complying Development Certificate, or Occupation Certificate. In practical terms, this covers most building work in NSW beyond minor cosmetic changes.
Projects that typically require a certifier include:
- New houses, duplexes, and townhouses
- Granny flats and secondary dwellings
- Major renovations and extensions that affect structure, waterproofing, or fire safety
- Swimming pool installations and compliance upgrades
- Demolition works
- Commercial fit-outs and change-of-use applications
- Knockdown and rebuild projects
Some minor works are classified as “exempt development” under the SEPP (Exempt and Complying Development Codes) 2008 and do not require certification. These include small garden sheds, certain fences, minor internal alterations, and other works that meet strict size and location criteria. If you are unsure whether your project needs a certifier, contact a certifier or your local council for advice.
Not sure what type of certification your project needs?
Whether you’re building a new home, adding a granny flat, or renovating, PROCERT can explain the approval pathway that applies to your project and what’s involved at each stage. No obligation, just clear answers.
Contact PROCERTFrequently Asked Questions
Is a building certifier the same as a building inspector?
Not exactly. A building certifier is an accredited professional who assesses plans, issues certificates (Construction Certificates, Complying Development Certificates, Occupation Certificates), and oversees compliance throughout a project. A building inspector may conduct inspections as part of a certifier’s team, but cannot issue certificates. The certifier holds the accreditation and legal responsibility. In NSW, the term “building inspector” is sometimes used loosely to refer to a certifier, but they are distinct roles under the Building and Development Certifiers Act 2018.
Can a building certifier reject my building plans?
A certifier does not “reject” plans in the way a council might refuse a Development Application. If your plans do not comply with the National Construction Code or conditions of consent, the certifier will identify the non-compliance and explain what changes are needed. Once your plans are amended to meet the required standards, the certifier can issue the certificate. A good certifier works with you to resolve issues rather than simply refusing the application.
Do I need a building certifier for minor renovations?
It depends on the scope of work. Minor cosmetic renovations (painting, replacing fixtures, non-structural changes) generally do not require certification. However, any work that affects the structure, fire safety, waterproofing, or plumbing of a building will require a Construction Certificate or Complying Development Certificate and the appointment of a Principal Certifier. If you are unsure, contact a certifier or your local council to confirm whether your renovation requires approval.
How much does it cost to appoint a building certifier in NSW?
Certification fees vary based on the type and complexity of your project. A certifier’s fee typically covers plan assessment, all mandatory inspections, certificate issuance, and documentation. The only standard additional cost is the NSW Planning Portal lodgement fee of $47 per application. Ask your certifier for an itemised quote so you can see exactly what is included before you commit.
Can I appoint a building certifier from a different area?
Yes. A registered building certifier can work anywhere in NSW regardless of where their office is located. There is no requirement to use a certifier based in the same local government area as your project. However, choosing a certifier with experience in your area can be beneficial, as they will be familiar with local council requirements and common site conditions. The certifier must attend all mandatory inspections in person regardless of location.
Key takeaways
- A building certifier is an independent, accredited professional who ensures your building work complies with NSW legislation and the National Construction Code.
- They assess plans, conduct mandatory inspections at six critical stages, and issue the certificates you need to start building and to occupy the finished structure.
- Both private certifiers and council certifiers have identical legal authority, but private certifiers typically offer faster turnaround and direct communication.
- The choice of certifier is yours, not your builder’s. This independence protects the integrity of the compliance process.
- Certifiers are regulated by Building Commission NSW, subject to audits, and face significant penalties for non-compliance.
- You must appoint a Principal Certifier before building work commences. The appointment is lodged through the NSW Planning Portal.
Understanding what your certifier does, and what you should expect from them, puts you in a stronger position from day one of your project.