NSW Professional Indemnity Insurance for Building Practitioners: What You Need to Know Before 1 July 2026

If you're a registered building practitioner in NSW, there's a deadline you can't afford to miss.

From 1 July 2026, every registered building practitioner in NSW must hold professional indemnity insurance. This has been coming since 2020 — deferred four times — but the NSW Government has made clear that this time it's happening. If you're registered under the Design and Building Practitioners Act and you don't have PI cover in place by 1 July, you're exposed to fines, potential suspension of your registration, and personal liability for defect claims.

This guide tells you exactly who needs cover, what adequate insurance actually means, what it costs, and how to sort it before the deadline.

What is professional indemnity insurance?

Public liability covers you if someone gets hurt or their property is damaged. Professional indemnity is different — it covers you for the financial loss caused by a mistake in your professional work. If you designed something wrong, certified something incorrectly, or gave advice that turned out to be faulty, PI is what pays out when a claim lands on your desk.

For builders working on multi-unit residential and aged care buildings in NSW, this is now going to be a legal requirement. Not just a good idea. A legal requirement.

Who has to hold PI insurance under the DBP Act?

The Design and Building Practitioners Act 2020 covers four categories of registered practitioners. Here's where each stands:

Design practitioners, principal design practitioners, and professional engineers — these three categories have been required to hold PI since 1 July 2021. Architects, structural engineers, fire safety engineers, façade engineers, civil engineers and others in these categories should already have cover in place.

Registered building practitioners — this is the group that's been exempt up until now. From 1 July 2026, you're in. Building practitioner registration covers three classes: body corporate, body corporate nominee, and general. Each has low-rise, medium-rise, or unrestricted conditions.

Building certifiers are covered under separate legislation and have their own PI requirements.

One thing that confuses a lot of people: it's the head building practitioner or principal contractor who needs to register and hold PI — not every subcontractor or tradie on the job.

What buildings does this apply to?

The DBP Act currently covers Class 2 buildings (residential apartment buildings), Class 3 buildings (boarding houses, hotels, large residential buildings), Class 9c buildings (aged care facilities), and mixed-use buildings that include any of the above. From 1 July 2026, remedial and renovation work on Class 3 and 9c buildings also comes into scope.

Why has this been deferred so many times?

The honest answer is that the PI insurance market wasn't ready. Insurers historically offered PI for designers and engineers — not for builders who construct the actual buildings. When the deadline first loomed in 2021, there simply weren't enough products available.

The NSW Government has pushed the deadline back each year since 2020. A new bill introduced in early 2026 could give the government power to extend the exemption indefinitely if the market still isn't ready. But major insurers — including DUAL Australia, Chubb, and Berkshire Hathaway Specialty Insurance — have now launched products specifically for registered building practitioners. The market has caught up. Don't bet on another deferral.

What does "adequate PI insurance" actually mean?

This is where NSW gets complicated — and it's caused a lot of confusion.

Unlike Victoria, which sets minimum dollar amounts, NSW doesn't specify a mandatory minimum coverage level. Instead, Clause 75 of the DBP Regulation says the insurance must provide adequate indemnity in the reasonable opinion of the registered building practitioner.

You have to make that judgment yourself, based on six factors:

• The nature and risks of the work you typically carry out
• The volume of work you typically do
• How long you've been registered
• A reasonable estimate of claims that could be brought against you
• Your financial capacity
• Any limits, exclusions, or conditions in the policy

And here's the bit most people miss — you have to write this down. Under Clause 78 of the Regulation, you must keep written records for at least five years documenting how you determined your coverage was adequate. If the Building Commission asks for those records, you hand them over.

How much cover do you actually need?

As a practical guide based on what brokers and practitioners are actually buying:

• Small residential builders, low turnover: $500,000–$1 million
• Medium-sized builders working on multi-unit projects: $2 million–$5 million
• Principal builders on large or high-risk developments: $5 million–$10 million

Most practitioners working on regulated buildings are landing at $1 million to $2 million as a floor, with many choosing $2 million to provide a reasonable buffer. Your broker will help you work through the adequacy assessment.

The 10-year retrospective duty of care

This is the part that catches people off guard.

Part 4 of the DBP Act creates a statutory duty of care — you must take reasonable care to avoid economic loss from defects in buildings you worked on. That duty runs to current and future owners of the building, even if there's no contract between you.

Here's the kicker: the duty is retrospective. It applies to construction work going back to June 2010 — a decade before the Act commenced. If someone is living in an apartment you built in 2013 and finds a defect today, you can potentially be held liable under the DBP Act.

This means the retroactive date and run-off cover in your PI policy matter enormously. Your policy needs to cover work going back to your registration date — or even earlier. When you're shopping for PI, ask your broker specifically about retroactive cover and whether the policy responds to the Section 37 duty of care.

Can I use my existing PI policy?

If you already hold PI for design or consulting work, your existing policy might cover your DBP Act obligations — but you need to check several things first.

Ask your insurer to confirm in writing that the policy covers your work as a registered building practitioner under the DBP Act, that there's no specific exclusion for the Section 37 duty of care, that the retroactive date goes back far enough, and that the business description matches your registration category. If any of these aren't ticked, you're not adequately covered.

What does PI insurance cost for NSW builders?

Practitioner type	Coverage level	Approx. annual cost
Small builder, turnover under $500k	$1M	$1,000–$2,500
Medium builder, turnover $500k–$5M	$2M–$5M	$2,500–$6,000
Larger firms and complex projects	$5M–$10M	$5,000–$15,000+
Design practitioners / engineers	$2M–$5M	$2,000–$10,000+

These are ballpark figures. Your actual premium depends on your registration class, turnover, claims history, coverage level, and the excess you choose. Raising your excess from $1,000 to $5,000 typically reduces the premium by 5–15%. Moving from $2M to $5M cover usually adds around 50% to your premium — not double — so the extra buffer is often worth it.

What happens if you don't have PI by 1 July?

The NSW Building Commission enforces the DBP Act. The penalties are real:

• $11,000 for an individual who carries out work or makes a compliance declaration without adequate PI
• $33,000 for a company
• Suspension or cancellation of registration
• Stop work orders on active projects

There's also a practical commercial problem: if you lodge compliance declarations without adequate PI, they may be challenged. And under the Security of Payment Act, an uninsured contractor can be blocked from using SOPA to obtain interim payments.

What to do right now

If you're already registered and don't hold PI: Start broker conversations now. Products are available from DUAL Australia, Chubb, and other major underwriters. Specialist construction insurance brokers can compare options and help you document your adequacy assessment.

If you hold an existing PI policy: Get written confirmation from your insurer that it covers your DBP obligations. Check the retroactive date and confirm there's no DBP Act exclusion.

If you're not sure whether you need to register: Check the Service NSW portal — you can verify registrations at service.nsw.gov.au. If you're a principal contractor on Class 2, 3, or 9c buildings, you likely need to be registered.

Document your adequacy assessment: Write down your coverage decision against the six Clause 75 factors. Keep those records for five years.

Use our comparison tool to find brokers who specialise in construction and building practitioner PI. Five questions, 60 seconds, no obligation.