When you hire a drainlayer, plumber, or gasfitter in New Zealand, you're trusting them with work that directly affects your home's safety, health, and structural integrity. The Plumbers Gasfitters and Drainlayers Board (PGDB) is the government-appointed body that makes sure these tradespeople meet strict standards — and gives you real recourse if something goes wrong.
What Is the PGDB?
The PGDB is a statutory body established under the Plumbers, Gasfitters, and Drainlayers Act 2006. Its core job is to regulate the trades of plumbing, gasfitting, and drainlaying across New Zealand. It sets the rules for who can legally carry out this work, how they must be trained and assessed, and what happens when standards aren't met.
The Board covers three distinct trades:
- Plumbing – water supply, sanitary fixtures, and related pipework inside buildings
- Gasfitting – installation and maintenance of gas appliances and pipework
- Drainlaying – underground drainage systems, stormwater, and wastewater pipes
Licensing and Registration: Your First Line of Protection
One of the most important protections the PGDB provides is a mandatory licensing system. Anyone carrying out restricted drainlaying, plumbing, or gasfitting work in New Zealand must hold a current licence or be supervised by someone who does.
There are different categories of registration:
- Licensed – fully qualified and authorised to work independently
- Certifying – can certify their own work as compliant
- Trainee – working under supervision while completing their apprenticeship
You can verify any tradesperson's registration status directly on the PGDB website using their online register. This takes just a minute and is well worth doing before work begins.
What Counts as Restricted Work?
Under NZ law, restricted work is work that must be done by (or under the direct supervision of) a licensed tradesperson. For drainlaying, this includes:
- Installing, altering, or repairing any drain connected to the public sewer or stormwater system
- Laying new drainage pipes on private property
- Connecting to council infrastructure
Homeowners are not permitted to carry out restricted drainlaying work themselves, even on their own property. Doing so is illegal and can result in fines, insurance issues, and problems when selling your home. Always check with your local council about what requires a building consent as well — some drainage work also triggers consent requirements under the NZ Building Code.
For guidance on building consents and Schedule 1 exemptions, MBIE Building Performance is the authoritative source.
Complaints and Disciplinary Process
If a licensed tradesperson does substandard or unsafe work, the PGDB gives you a formal complaints process. Here's how it works:
| Step | What Happens |
|---|---|
| 1. Lodge a complaint | Submit your complaint to the PGDB in writing |
| 2. Assessment | The PGDB assesses whether the complaint falls within their jurisdiction |
| 3. Investigation | A formal investigation may be carried out |
| 4. Hearing | A disciplinary tribunal can hear serious cases |
| 5. Outcome | Penalties can include fines, suspension, or cancellation of licence |
This process means tradespeople have a genuine incentive to do quality work — their livelihood depends on maintaining their registration.
Competency Standards and Ongoing Requirements
The PGDB doesn't just issue licences and walk away. Registered tradespeople must:
- Meet ongoing competency requirements
- Renew their annual practising licence
- Stay up to date with changes to the NZ Building Code and relevant standards (such as those published by Standards NZ)
This ongoing oversight means the tradesperson you hire today is held to current standards, not just the ones that applied when they first qualified.
Certificates of Authorisation
When restricted work is completed, your tradesperson should provide a Certificate of Authorisation (CoA). This is a legal document confirming the work was carried out by a licensed person and meets the required standards. Keep this document safe — you may need it when selling your home or making an insurance claim.
Healthy Homes and Rental Properties
For landlords, the PGDB's oversight is especially relevant. Drainage and plumbing defects can directly affect whether a rental property meets the Healthy Homes Standards. Using a licensed drainlayer ensures work is done to code and protects you from potential liability.
When to Call a Professional
Any time you suspect a drainage problem — slow drains, gurgling pipes, wet patches in the yard, or sewage smells — call a licensed drainlayer. Don't attempt to dig up or modify drainage pipes yourself. Beyond the legal issues, poorly done drain work can cause serious health hazards, property damage, and costly repairs down the track.
You can find qualified, licensed drainlayers in your area right here on tradedirectory.co.nz.
Sources & Further Reading
- Plumbers Gasfitters and Drainlayers Board – verify licences, lodge complaints, and learn about the regulatory framework
- MBIE Building Performance – NZ Building Code, consents, and Schedule 1 exemptions
- Standards NZ – NZ standards relevant to drainage and plumbing work
- Tenancy Services – Healthy Homes – rental property compliance requirements
- WorkSafe NZ – health and safety obligations for trade work
- BRANZ – building research and best practice guidance
Certifying Drainlayer
