Replacing a toilet suite in New Zealand is one of those jobs that sits right on the line between DIY and licensed trade work. The short answer is: you can do some of it yourself, but the plumbing connections must be done by a licensed plumber. Getting this wrong isn't just a legal issue — it can cause leaks, contamination, and costly damage to your home.
What the Law Says About Plumbing Work in NZ
Under the Plumbers, Gasfitters, and Drainlayers Act 2006, certain plumbing tasks are classified as restricted work and must be carried out (or supervised) by a licensed tradesperson registered with the Plumbers Gasfitters & Drainlayers Board (PGDB). This exists to protect public health and the integrity of NZ's water supply and drainage systems.
Restricted plumbing work includes:
- Connecting or disconnecting any pipe to the water supply system
- Connecting or disconnecting any pipe to the sanitary drainage system
- Any work on sanitary fixtures that involves those connections
Because a toilet suite connects to both the water supply (the cistern fill valve) and the sanitary drain (the pan connector and soil pipe), both of these connections are restricted work.
What a Homeowner CAN Legally Do
While the connections themselves are restricted, there are parts of the job a competent homeowner can tackle:
- Removing the old toilet — unbolting the pan from the floor and lifting it away (once the water is shut off and the cistern is empty)
- Preparing the area — cleaning up, checking the floor condition, measuring up
- Assembling the new cistern to the pan — most suites come flat-packed and the cistern-to-pan assembly is mechanical, not a plumbing connection
- Installing the toilet seat
- Purchasing and sourcing the new suite — popular NZ suppliers include Bunnings, Mitre 10, and PlaceMakers
In practice, many homeowners do the removal and prep work, then have a licensed plumber come in to make the final connections — this can save on labour time and cost.
What a Licensed Plumber MUST Do
The following tasks must be performed by a licensed plumber:
- Isolating and reconnecting the water supply line to the cistern
- Fitting or replacing the pan connector (the fitting between the toilet pan and the soil pipe)
- Ensuring the installation complies with NZS 4305 (domestic plumbing) and the NZ Building Code, particularly clauses G12 (Water Supplies) and G13 (Foul Water)
- Issuing a Certificate of Compliance for the restricted work — this is an important document for your records and may be required if you sell your home
Always ask your plumber for this certificate once the work is complete.
Does Replacing a Toilet Need a Building Consent?
In most cases, no building consent is required to replace a like-for-like toilet suite. This type of maintenance and repair work typically falls under Schedule 1 of the Building Act 2004 as exempt building work. However, exemptions have conditions — for example, if you're changing the location of the toilet or doing associated structural work, consent may be needed.
Always confirm with your local council before starting, as exemptions can depend on your specific situation and property type.
Choosing the Right Toilet Suite
When selecting a new suite, keep these NZ-specific points in mind:
| Factor | What to Check |
|---|---|
| Pan connector size | Match to your existing soil pipe (typically 100 mm in NZ) |
| Rough-in distance | Distance from wall to drain centre — measure before buying |
| Water efficiency | Look for WELS-rated suites (3-star or higher recommended) |
| Cistern type | Close-coupled, wall-hung, or back-to-wall — affects installation complexity |
| Healthy Homes | Rental properties must meet Healthy Homes Standards |
WELS (Water Efficiency Labelling and Standards) ratings help reduce water use — a good consideration given NZ's increasing focus on water conservation.
Safety Notes
- Turn off the water supply at the isolating valve (usually behind or beside the toilet) before doing any work. If there's no isolating valve, you may need to shut off at the toby (street valve) — your plumber can also install an isolating valve while they're there.
- Toilet pans can be heavier than they look — get a hand with lifting.
- Old pan connectors may contain lead-based compounds in very old homes. If your home was built before the 1970s, mention this to your plumber.
- Wear gloves and eye protection when handling old sanitary fittings.
When to Call a Professional
You should call a licensed plumber for any toilet replacement — even if you plan to do the removal yourself. A plumber will ensure the connections are watertight, compliant with the NZ Building Code, and backed by a Certificate of Compliance. If you notice cracked floor tiles, soft flooring around the base, or signs of a slow leak from the old toilet, a plumber can also assess for hidden water damage before it gets worse.
You can find qualified, local plumbers in your area through tradedirectory.co.nz.