When hiring a drain cleaner in New Zealand, the qualifications required depend on the type of work being done. Routine drain unblocking is generally unregulated, but any work that involves physically repairing, modifying, or connecting drains is restricted work under NZ law and must be carried out by a licensed tradesperson. Knowing the difference can save you from costly mistakes and potential legal issues.
The Key Licensing Body: The PGDB
In New Zealand, drainlaying work is regulated by the Plumbers, Gasfitters and Drainlayers Board (PGDB). The PGDB is the statutory body responsible for licensing and registering tradespeople who carry out sanitary plumbing, gasfitting, and drainlaying. If a drain cleaner is doing anything beyond simply clearing a blockage — such as repairing a broken pipe, relining a drain, or connecting to the public sewer — they must hold a current PGDB licence.
You can verify a tradesperson's licence status directly on the PGDB website. Always ask to see proof of licence before work begins.
What Counts as Restricted Drainlaying Work?
Under the Plumbers, Gasfitters, and Drainlayers Act 2006, the following activities are considered restricted work and must be performed by a licensed drainlayer:
- Laying, altering, repairing, or connecting any drain or sewer
- Installing or replacing inspection chambers and manholes
- Drain relining (CIPP or similar methods) that involves permanent repair
- Any work connecting to the territorial authority's wastewater or stormwater network
If unlicensed work is carried out on restricted drainlaying, the homeowner and the tradesperson can both face legal consequences. Check with MBIE Building Performance for guidance on what requires a building consent as well — some drainage work may also trigger consent requirements.
What About Routine Drain Cleaning?
Simple drain cleaning — such as using a high-pressure water jetter or a drain snake to clear a blockage — is not restricted work under the Act. This means a drain cleaning company does not legally need a PGDB licence just to unblock a drain. However, this doesn't mean qualifications are irrelevant.
A reputable drain cleaning company should still be able to demonstrate:
- Relevant trade training or experience (e.g., an apprenticeship or trade certificate in plumbing and drainlaying)
- Public liability insurance — essential if something goes wrong
- Health and safety compliance under the Health and Safety at Work Act 2015, overseen by WorkSafe NZ
- Familiarity with CCTV drain inspection equipment and reporting
Qualifications to Look For
Here's a quick summary of what to look for depending on the job:
| Type of Work | Licence Required? | What to Check |
|---|---|---|
| Unblocking a drain (jetting/snaking) | No | Insurance, experience, reviews |
| CCTV drain inspection | No | Equipment quality, written report |
| Drain repair or relining | Yes (PGDB) | Current PGDB licence |
| New drain connection or alteration | Yes (PGDB) | PGDB licence + possible building consent |
| Connecting to public sewer/stormwater | Yes (PGDB) | PGDB licence + council approval |
Trade Certificates and Training
Many professional drain cleaners hold a New Zealand Certificate in Plumbing, Gasfitting and Drainlaying (Level 4) or have completed an apprenticeship through a polytechnic or industry training organisation. This training covers drain systems, pipe materials, drainage design, and safe working practices.
While a certificate isn't legally required for basic drain cleaning, it's a strong indicator that the person understands how drainage systems work and is less likely to cause accidental damage.
Building Consent Considerations
Some drainage work — particularly new installations or significant alterations — may require a building consent from your local council. Schedule 1 of the Building Act 2004 lists certain exemptions, but these can be complex. Always check with your local council before undertaking or commissioning drainage work that goes beyond a simple unblock. MBIE Building Performance provides useful guidance on when consents are needed.
When to Call a Professional
You should always call a qualified professional when:
- Your drain is repeatedly blocking (could indicate a collapsed or root-invaded pipe)
- You notice sewage smells inside or outside your home
- Water is backing up into multiple fixtures
- You need any drain repaired, relined, or connected
- A CCTV inspection reveals structural damage
For any work involving repair or connection, make sure your tradesperson holds a current PGDB licence. You can find qualified, local drain cleaning professionals on tradedirectory.co.nz.
Safety Note
Drain work can involve exposure to raw sewage, hazardous gases (including hydrogen sulphide), and confined spaces. Professional drain cleaners should follow safe work practices as required under the Health and Safety at Work Act 2015. Never attempt to enter a drain or manhole yourself — this is extremely dangerous and should only be done by trained professionals with appropriate equipment.
Sources & Further Reading
- Plumbers, Gasfitters and Drainlayers Board (PGDB) — licence verification and regulatory information
- MBIE Building Performance — building consents and the NZ Building Code
- WorkSafe NZ — health and safety requirements for trade work
- BRANZ — building research and best practice guidance
- Standards NZ — NZ drainage standards including AS/NZS 3500
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