What are the health and safety law changes for NZ plumbers?

From 1 April 2027, plumbing, gasfitting and drainlaying businesses with 1–19 workers will mainly need to manage critical risks plus basic worker welfare. For the trade that means trench and excavation collapse, confined spaces (tanks, manholes, subfloor and ceiling voids), gas work, asbestos (pipe lagging and pre-2000 buildings), and falls from height on roof and cylinder work. Approved Codes of Practice become a legal safe harbour, and working-at-height controls become risk-based. The Health and Safety at Work Amendment Bill passed 1 July 2026; current rules apply in full until commencement.

Do trench safety rules change under the new law?

Trench collapse remains a critical risk under any reading of the new definition — unshored trench walls can bury a worker in seconds, and NZ has had multiple trenching fatalities. Expect the practical requirements to carry over: shore, bench or batter excavations over 1.5m, locate services before digging (beforeUdig), keep spoil and loads back from edges, and provide ladder access. What may improve is the paperwork-to-protection ratio: under the critical-risk focus, a drainlaying crew's compliance effort concentrates on the trench, the services, and the confined spaces — not generic policy documents.

Does the amendment change gasfitting rules?

No. Gasfitting certification under the Gas (Safety and Measurement) Regulations and PGDB licensing are completely separate regimes and are untouched by this reform. Gas work remains a critical risk for your HSWA duties — fire, explosion and carbon monoxide are all capable of causing death or notifiable injury — so it belongs on your critical risk register with controls like isolation, testing, ventilation and certification. The amendment changes how much general H&S paperwork sits around that work, not the gas-specific rules themselves.

Is confined space entry still heavily regulated for plumbers and drainlayers?

Yes — confined spaces are among the clearest critical risks in the trade. Tanks, manholes, wastewater chambers, and tight subfloor or ceiling voids can hold toxic or oxygen-deficient atmospheres that kill quickly, and would-be rescuers are historically among the victims. Keep permits before entry, atmosphere testing, a standby person and a rescue plan as your baseline controls. AS 2865 practice and existing WorkSafe guidance continue to apply, and if a confined-space ACOP is published under the new safe-harbour regime, following it will constitute deemed compliance.

What should a small plumbing firm do before April 2027?

Three moves. First, build a critical risk register for your actual work mix — trenches, confined spaces, gas, asbestos, working at height — and go through it with your crew and apprentices. Second, keep the welfare basics (first aid, emergency plan, facilities) because those duties continue under the new regime. Third, track the Approved Codes of Practice as WorkSafe publishes them — each one you adopt becomes a legal safe harbour for that risk. Don't wind anything back before 1 April 2027; the current Act is enforced until then, and PGDB obligations never change.

Health & Safety Changes for NZ Plumbers 2026-27

Plumbing is one of the few trades whose critical risks are mostly not about height: trenches, confined spaces, gas and asbestos do the killing. The Health and Safety at Work Amendment Bill — passed 1 July 2026, in force 1 April 2027 — restructures small-business compliance around exactly those risks.

What changes for plumbing, gasfitting and drainlaying firms

Critical risks become the core duty (1–19 workers). The trade's critical list:

Trench and excavation collapse — shore/bench/batter over 1.5m, locate services first
Confined spaces — tanks, manholes, subfloor and ceiling voids
Gas work — fire, explosion, carbon monoxide
Asbestos — pipe lagging, pre-2000 wall and floor penetrations
Falls from height — roof flashings, header tanks, cylinder work

All pre-loaded for plumbers in the free Critical Risk Register Generator.

Less generic paperwork. Firms with 1–19 workers keep basic welfare duties (first aid, emergency plan, facilities) but drop the expectation of formal policies for low-consequence risks. Most plumbing firms sit well inside that threshold.

ACOPs become a safe harbour. Follow an Approved Code of Practice for a risk and you're deemed compliant for it. As codes are published through 2026–27, adopting each one is the cheapest defensible position available.

Height work gets proportionate. Short-duration tasks — a roof flashing repair, a valve on a header tank — fall under the new risk-based hierarchy from April 2027. See the working at height changes guide.

What doesn't change

PGDB licensing and the Plumbers, Gasfitters and Drainlayers Act — untouched.
Gas certification under the Gas (Safety and Measurement) Regulations — untouched.
Notifiable events — still reported to WorkSafe.
Until 1 April 2027 — the current Act applies in full.

What to do now

Print a critical risk register for the van and brief the crew.
Keep welfare basics current.
Adopt each ACOP as WorkSafe releases it.

Planning trench work? Pair the register with the drain grade calculator and earthworks calculator. Full reform picture: 2026 H&S law changes hub. Local trade contacts: plumbers directory.

H&S Law Changes for NZ Plumbers, Gasfitters & Drainlayers — April 2027

What changes for plumbing, gasfitting and drainlaying firms

What doesn't change

What to do now

Related Guides & Tools

Free NZ Tradie Templates