Public Liability vs Professional Indemnity NZ 2026

Public liability (PL) and professional indemnity (PI) are the two commercial covers most commonly confused with each other. They look similar from a distance — both are 'liability' covers, both respond to claims by third parties, both pay legal defence costs. But they cover materially different exposures, are usually written on different bases, and many businesses need only one rather than both. This guide breaks down the difference, walks through the decision, and gives industry-specific examples.

The short version

Public liability responds when your business operations cause third-party bodily injury or third-party property damage. Think: a customer trips on a wet floor, a tradie drops a hammer on a client's car, a delivered meal contaminates a customer.

Professional indemnity responds when your professional advice, service or specification causes a client to suffer financial loss. Think: an accountant misses a tax deadline, an architect's specification is wrong, a consultant's recommendation leads to a failed project.

The two covers can overlap occasionally (e.g. a design-and-build builder whose design caused property damage), but they sit on different sides of the line: physical incident → PL; advice failure → PI.

Side-by-side comparison

Aspect	Public Liability	Professional Indemnity
Trigger	Third-party injury or property damage caused by your operations	Financial loss caused by your professional advice, error, omission or breach of duty
Typical claimant	Customer, member of the public, neighbouring business, other trade on site	Client of your professional service
Example	Customer slips in your café and breaks a wrist	Your design specification is wrong and the building has to be rebuilt
Policy basis	Occurrence (policy at time of event responds)	Claims-made (policy at time of claim responds)
Retroactive date	Not applicable	Usually set at policy inception; past work not covered without explicit extension
Run-off cover on cessation	Usually not needed (occurrence basis)	Important (claims-made basis) — past work can generate claims years later
Common limits	$1m, $2m, $5m, $10m	$250k, $500k, $1m, $2m, $5m+
Care, custody and control exclusion	Standard — damage to item being worked on usually excluded	Not applicable
Triggered by physical operations?	Yes — the core trigger	No — physical damage usually outside scope (handled by PL)
Triggered by advice failure?	Usually no	Yes — the core trigger

Which do I need? Decision walk-through

Do you operate from a premises with public access (a shop, café, clinic, salon)? → Yes: PL is almost certainly required. → No: PL may still apply if you visit client sites.
Do you go to client premises to deliver a service (tradie, cleaner, contractor)? → Yes: PL is required.
Do you give professional advice for a fee (consulting, accounting, design, financial advice, IT)? → Yes: PI is required. → No: PI usually not needed unless a contract requires it.
Do you produce technical specifications, designs, or sign off on others' work? → Yes: PI is required (design-and-build, engineering, architecture).
Do you only sell physical product, with no advice element? → PL is required for the physical operation. PI usually not needed unless product liability is involved.
Are you required by a regulator, professional body, or contract to hold one or both? → Hold what's required. Many NZ professional bodies (Engineering New Zealand, NZICA, Royal NZ Institute of Architects, certain financial-adviser registrations) require PI; many commercial contracts and councils require PL.

Industry examples

Tradies and physical-operations businesses

Builders, plumbers, electricians, cleaners, gardeners, scaffolders → PL required, PI usually not unless they sign off on design or specifications. Design-and-build operators are the exception and usually carry both.

Professional services

Accountants, lawyers-adjacent consultants, financial advisers, IT consultants, marketing consultants → PI required, PL optional (PL becomes required if clients visit the office, or if you visit client sites).

Healthcare and allied health

GPs, physios, chiropractors, counsellors → Both usually required. PL for the clinic premises, PI for clinical advice and treatment decisions. Most NZ practitioner-registration bodies require PI as a condition of registration.

Retail and hospitality

Cafés, restaurants, retailers, food trucks → PL required, PI usually not. The exception is where significant advice is part of the service (e.g. a wine retailer giving paid wine-pairing advice).

Tech and software

Software developers, SaaS operators, IT consultants → PI required, PL optional. Cyber is also a critical add-on for any business holding customer data. A code defect that causes a customer financial loss usually triggers PI.

Design-and-build, architecture and engineering

Architects, engineers, design-and-build builders → Both required. Most professional-body registrations require PI; most contracts require PL. The interplay between the two is the central insurance-design question for these professions.

For deep-dives on each cover, see our public liability insurance and professional indemnity insurance guides. For broader cover priorities, see the small business insurance hub.

Frequently asked questions

Can I have just one or do I need both?

It depends on the business. A purely advice-based business (consultant, accountant, software developer) where no client visits and no physical operations happen often carries professional indemnity only. A purely physical-operations business (cleaner, builder, retailer) often carries public liability only. Many businesses do both — they give advice and have physical operations. A 30-minute conversation with an adviser usually settles this for a specific operation.

Which is more expensive, PL or PI?

Premiums depend on the trade, turnover, claims history and chosen limits — not directly on which cover type. Higher-risk professions (lawyers, architects, engineers, financial advisers, certain consultants) often pay more for PI than they would for PL. Higher-risk physical trades (roofers, scaffolders, demolition) often pay more for PL than they would for PI. There's no universal 'one is more expensive'.

What's the typical claim pattern for each?

Public liability claims are usually triggered by an event — a slip, a damaged item, a contaminated product. The claim is often reported soon after the incident. Professional indemnity claims are usually triggered by a discovered outcome — a project failed, advice turned out to be wrong, financial loss emerged later. PI claims often surface months or years after the work itself.

Are PL and PI written on the same basis?

Usually no. Public liability is typically written on an 'occurrence' basis — the policy in force when the incident occurred is the one that responds. Professional indemnity is typically written on a 'claims made' basis — the policy in force when the claim is reported (or threatened) is the one that responds. This matters because gaps in PI cover (e.g. cancelling and not running off) can leave past work uncovered.

Does professional indemnity cover work I did before the policy started?

PI is usually written on a claims-made basis with a stated 'retroactive date'. Work done before the retroactive date is not covered. When you set up PI for the first time, the retroactive date is usually the same as the policy start, meaning past work is not covered. Some insurers will offer 'unlimited retroactive' for clean businesses with no prior insurance.

What happens to PI cover when I retire or sell the business?

Because PI is claims-made, the policy must be in force when a claim is reported. If you cancel cover on retirement, claims arising later (from work done while you were trading) will not be covered. This is why 'run-off cover' exists — a tail policy that maintains PI for a defined period after you stop trading. Standard run-off periods are 3-7 years; some professional bodies require run-off as a condition of ceased registration.

Public Liability vs Professional Indemnity