Health and Safety for Contractors NZ: Your PCBU Duties Explained

Most site injuries don't happen because no one had a safety plan. They happen because everyone assumed someone else's plan covered them. If you're a subcontractor or a sole trader on a construction site in New Zealand, that assumption will get you — and possibly your workers — hurt.

Understanding health and safety for contractors NZ starts with one fact: every contractor, subcontractor, and sole trader is a PCBU. The law doesn't carve out an exemption for subbies, and the principal's SSSP doesn't discharge your duty. Here's what you actually hold, and what you need to evidence it.

What "PCBU" Actually Means for a Subcontractor

Before you arrive on site at 6:45am to sign in, you are already a PCBU. "Person Conducting a Business or Undertaking" applies to you the moment you employ anyone, engage subcontractors, or direct workers — regardless of how many people that is.

Under section 36 of the Health and Safety at Work Act 2015 (HSWA), every PCBU holds the primary duty of care: you must ensure, so far as is reasonably practicable, the health and safety of your workers and anyone else affected by your work. That means a two-person plumbing subcontractor is a PCBU. A sole-trader scaffolder is a PCBU. A director of a small formwork company is a PCBU.

What "so far as is reasonably practicable" means in practice depends on the risk. For high-risk construction work — work at height, confined spaces, trenching, working near live services — the bar is high. You need documented controls, not just a conversation at the start of the job.

Section 45 adds that your workers also carry their own duties: they must take reasonable care for their own safety and that of others, and they must not recklessly interfere with anything provided for their protection. Worker engagement under sections 58 and 59 means you must give workers genuine opportunities to raise safety concerns and to participate in improving the safety of their work. A toolbox talk sign-off sheet once a fortnight doesn't satisfy this on its own.

what worker participation looks like in practice

Overlapping PCBU Duties: Why the Main Contractor's Plan Doesn't Cover You

At 7am on a busy commercial fitout, the principal contractor runs an induction and hands out a copy of their SSSP. One of the tiling subcontractors assumes that's their safety management sorted. It isn't.

Section 34 of HSWA deals directly with this scenario: where more than one PCBU has a duty in relation to the same matter, each must meet that duty to the extent of their capacity to influence and control the matter. Critically, a duty cannot be transferred. More than one PCBU can hold the same duty concurrently. The principal contractor's plan doesn't absorb yours.

What s34 also requires is co-ordination. On a shared site with multiple PCBUs, you must consult and co-operate with the other PCBUs — the principal, other subbies working in your area, anyone whose work overlaps with yours. If a concrete subcontractor and an electrical subcontractor are both working in the same zone, both hold duties, and both need to co-ordinate.

In practice, overlapping duties look like this:

Step 1: Identify all PCBUs working in your area — before your crew starts, check who else is active in the same zone. Get contact details for their supervisor.

Step 2: Compare your hazard registers — if your work creates a hazard for another trade (dust, noise, live edges, plant movement), document that you've communicated it.

Step 3: Align your task analyses with the principal's site procedures — your TA doesn't replace theirs, but it must be consistent with site rules on access, plant exclusion zones, and PPE.

Step 4: Record the co-ordination — a brief note in the toolbox talk record or a shared site diary entry is enough. What you need is evidence you did it.

Step 5: Update when scope changes — if your work area shifts or a new task starts, repeat the process. An SSSP updated once at mobilisation and never touched again is a liability document, not a live tool.

If a WorkSafe inspector arrives on site, they will look at whether your documents reflect how work is actually being done. A well-formatted SSSP that doesn't match the current scope carries little weight in an investigation.

The Director Duty Most Small Contractors Miss: Section 44

When a sole trader scales up and hires a few workers, the director — often the same person who's still swinging a hammer on site — picks up a duty they may not know exists.

Section 44 of HSWA imposes a due diligence obligation on officers of a PCBU. An officer includes a company director and anyone who exercises significant influence over the management of a business. For a small contractor running a limited liability company, that's you.

Due diligence under s44 means actively verifying that your business has appropriate health and safety systems in place — not just signing off on a plan someone else wrote. Specifically, an officer must:

Keep up to date with health and safety matters relevant to the operations
Understand the hazards and risks of the business
Ensure the PCBU has, and uses, appropriate resources and processes
Ensure workers are consulted and can raise concerns
Verify that reporting and investigation processes are actually working

This is not a delegate-and-forget obligation. If a worker is seriously injured on one of your sites and WorkSafe investigates, they will look at what you, as the officer, actually did — not just what the safety documents say.

Use this template to do a basic s44 self-check at the start of each project:

Officer Due Diligence Check — Project Start Trade: [e.g. structural steel / concrete / roofing] Project location: [suburb/region] Date: [DD/MM/YYYY] Number of workers: [X]

Have I reviewed the SSSP for this project? Y / N

Is our prequalification (SiteWise / Site Safe) current? Y / N — expiry: [date]

Do I have task analyses for all high-risk work scopes? Y / N

Are training records current and matched to the tasks being done? Y / N

Have workers had a genuine opportunity to raise concerns before work started? Y / N

Do I know who to call if a notifiable event occurs? Y / N — 0800 030 040

Notes / actions required:

Complete this, keep a copy, and review it when the scope changes. It's not a compliance guarantee, but it's the kind of evidence that demonstrates an officer was actively engaged — not passive.

What You Need in Place Before Site Entry

Most major principals now require a valid Site Safety Card before they'll allow site entry. Beyond that card, here's what you should have documented before your crew mobilises — particularly if you're working on a site governed by a prequalification scheme like SiteWise.

Document / Requirement	What It Covers	Common Gap
Current prequalification	Demonstrates baseline H&S management	Expired or wrong category for trade
Site-specific safety plan (SSSP)	Site hazards, emergency procedures, responsibilities	Generic plan not updated for scope
Task analysis (TA) per high-risk scope	Controls for specific high-risk work	Missing for silica dust, confined spaces
Hazard register	Live site hazards and controls	Completed at mobilisation, never reviewed
Training records	Competency for tasks being performed	Records don't match actual work activities
PPE and plant register	Equipment condition and inspection history	No record of pre-start checks
Worker induction records	Site-specific induction completed	Workers signed on without site induction
Incident and near-miss records	Captures events and corrective actions	Near-misses not recorded
Toolbox talk records	Evidence of worker engagement	Sign-off sheets with no content recorded

how to write a site-specific safety plan that actually gets used

The General Risk and Workplace Management Regulations 2016 and the Asbestos Regulations 2016 sit alongside HSWA and set specific obligations that your SSSP and hazard register need to reflect. If your work involves asbestos removal or disturbance, hazardous substances, or working in confined spaces, those regulations impose additional requirements beyond the primary duty.

Contractor H&S Responsibilities NZ: The Document Register You Need to Maintain

Halfway through a project, a near-miss occurs — a worker nearly contacts an overhead line during a crane lift. No injury, but the event triggers a WorkSafe notification obligation. At that point, the question isn't whether you had an SSSP. It's whether your documents reflect the actual work, and whether you can show a trail of co-ordination, engagement, and active management.

Here's a practical naming convention to keep your contractor document register organised across projects:

CONTRACTOR H&S DOCUMENT REGISTER — NAMING CONVENTION

[TRADE]-[PROJECT_CODE]-[DOC_TYPE]-[VERSION]-[DATE]

Examples:
ELEC-PRJ001-SSSP-v2-20250610       → Electrician SSSP, version 2, 10 June 2025
CONC-PRJ001-TA-CONFINED-v1-20250701 → Concrete sub TA for confined space work
PLMB-PRJ001-TOOLBOX-WK22-20250528   → Plumber toolbox talk record, week 22
ROOFG-PRJ001-INCIDENT-001-20250715  → Roofer incident report #001

File location: [shared drive path or platform folder]
Review trigger: Scope change / new high-risk task / after any incident

Keeping this consistent means when a principal's H&S manager or a WorkSafe inspector asks for documentation, you're not digging through email threads. It also makes evidencing your s36 and s34 duties straightforward.

Frequently Asked Questions

Am I a PCBU if I'm a sole trader working by myself?

Yes. A sole trader who employs no one is still a PCBU under HSWA 2015, and holds the primary duty of care for anyone affected by their work — including other workers on site and members of the public. You carry a slightly different set of obligations than an employer PCBU, but you are not exempt from the Act.

Does the main contractor's SSSP cover my crew?

No. Under section 34 of HSWA, each PCBU holds its own duty. The principal contractor's SSSP sets site rules and procedures, and you must align with them — but it does not discharge your obligation to have your own task analyses, hazard register, and worker engagement records.

What does officer due diligence actually require me to do?

Section 44 of HSWA requires you, as a director or officer, to actively verify that your business has appropriate health and safety resources and processes — and that they're actually working. This means reviewing systems, staying informed on hazards relevant to your trade, and ensuring workers can raise concerns. Delegation doesn't remove your personal obligation.

What do I need to have in place before I can work on site?

At minimum: current prequalification, a site-specific safety plan for the project, task analyses for any high-risk work scopes, a hazard register, current training records matched to the work being done, and evidence of worker induction and engagement. Most principals will also require a valid Site Safety Card before your crew enters.

The Bottom Line

Three things to take away and act on:

You hold your own duty. Section 36 applies to every contractor and subcontractor, regardless of what the principal has in place. Check that your SSSP and task analyses reflect the actual work — not a generic template.
Co-ordinate on shared sites. Section 34 requires it. Document that you've spoken to the other PCBUs working in your area, aligned your controls, and communicated your hazards. A brief written record is enough.
If you're a director, read section 44. Due diligence is your personal obligation. Run the self-check template at the start of each project and whenever scope changes.

For more on the documents that underpin these obligations, start with the SSSP structure:

Site-Specific Safety Plan NZ: What to Include and How to Keep It Live

Health and Safety for Contractors NZ: PCBU Duties Explained