Your builder can't choose
your certifier. You do.

Somewhere between your Construction Certificate and the first day on site, you'll make an appointment most homeowners have never heard of: the Principal Certifier. It's one of the most important decisions in your build — and one of the least understood.

What a Principal Certifier actually does

Think of the PC as the independent referee of your build. They're not working for your builder and they're not designing anything. Their job is to check that the build progresses in line with its approvals: carrying out the mandatory critical-stage inspections (footings, framing, waterproofing and so on, depending on the build), addressing compliance issues along the way, and ultimately issuing your Occupation Certificate when the finished building stacks up.

The rule most people don't know

You, the owner, choose and appoint the Principal Certifier. Your builder isn't allowed to appoint one for you, and shouldn't be steering you toward a particular certifier either. The independence is the entire point — the PC is there to protect the integrity of the build, not the builder's schedule.

You can appoint either your local council or a registered private certifier. The appointment must be in place before any work starts, and it's made through the NSW Planning Portal — the same place your Notice of Commencement is lodged.

How to choose well

• Check registration. Certifiers in NSW must be registered — verify their registration and its class before engaging anyone.
• Local experience counts. A certifier who works your area regularly knows the council, the common conditions, and the local quirks.
• Ask about responsiveness. Slow inspections and slow paperwork at the certifier's end become your delays. Ask how quickly they typically turn around inspections and certificates.
• Get the fee structure upfront. Understand what's included — inspections, the OC, re-inspections if something fails.
• Be wary of a hard sell. If a builder is pushing one certifier insistently, treat that as a reason to look more closely, not less.

When to sort this out

Early. The appointment is a prerequisite for starting work, and the good certifiers book up. The week your DA is approved — while your CC documentation is being assembled — is the right time to be comparing certifiers, so everything lands together and nothing holds up your start date.

Not sure where certifiers fit into your project? We coordinate the whole approvals side — documentation, certifier liaison, inspections and OC — so you always know what's next. Start with the free assessment.