Connecting a new laundry tub 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 the preparation yourself, but the actual connection to your water supply pipes and household drainage is restricted plumbing work that must be carried out by a licensed tradesperson. Getting this wrong can result in fines, insurance issues, and a failed building inspection.
What the Law Says About Plumbing Work in NZ
Under the Plumbers, Gasfitters, and Drainlayers Act 2006, certain plumbing and drainlaying tasks are classified as restricted work. This means only a person registered and licensed with the Plumbers, Gasfitters and Drainlayers Board (PGDB) can legally carry them out (or supervise them). Restricted plumbing work includes:
- Connecting or altering any water supply pipework (hot or cold)
- Connecting waste pipes to the household drainage system
- Installing or altering sanitary fixtures where it involves those connections
Doing restricted work yourself — or hiring an unlicensed person — is illegal and can void your home insurance. Always check with the PGDB if you're unsure whether a specific task is restricted.
What a Homeowner CAN Legally Do
There are still useful tasks you can tackle yourself to save time and money before the plumber arrives:
- Removing the old laundry tub (once water is turned off at the isolation valve or toby)
- Assembling the new tub cabinet or stand — most flat-pack laundry tubs come with a cabinet that requires no plumbing to put together
- Positioning the tub in its final location
- Purchasing fittings and fixtures — your plumber will often appreciate you having the tub and tapware ready to go
- Painting or preparing the surrounding area before installation
If your existing laundry tub already has isolation valves on the supply lines and a trapped waste that simply pushes into a standpipe (a common setup in many NZ homes), some people interpret disconnecting the old tub as non-restricted. However, reconnecting to supply and waste is still restricted work. When in doubt, ask a licensed plumber.
Does It Need a Building Consent?
In most cases, replacing a like-for-like laundry tub in the same location does not require a building consent — it typically falls under Schedule 1 of the Building Act 2004 as exempt work. However, if you're moving the tub to a new location, adding new drainage, or doing significant alterations, a consent may be required.
Always confirm with your local council before starting work. Requirements can vary between territorial authorities. You can find general guidance at MBIE Building Performance.
Choosing Your New Laundry Tub
Laundry tubs in NZ come in a range of materials — polyethylene, stainless steel, and fibreglass are the most common. Key things to consider:
| Factor | What to Look For |
|---|---|
| Size | Standard NZ laundry tubs are typically 45–60 cm wide |
| Tapware | Check if taps are included or need to be purchased separately |
| Waste outlet | Confirm it suits your existing trap/waste setup |
| Cabinet | Freestanding or wall-mounted to suit your laundry layout |
| Material | Polyethylene is durable and low-maintenance for NZ conditions |
You'll find a good range of laundry tubs at Bunnings, Mitre 10, and PlaceMakers.
Hot Water Connections — Extra Care Required
If your laundry tub will have a hot water supply, be aware that hot water systems in NZ are subject to additional requirements under the NZ Building Code clause G12 (Water Supplies). Any work on hot water pipework is firmly in restricted territory. A licensed plumber will ensure your installation meets the required standards, including correct tempering valve installation where needed.
Healthy Homes and Rental Properties
If you're a landlord, note that laundry facilities can intersect with Healthy Homes Standards requirements around drainage and moisture control. Ensure any laundry installation is properly waterproofed and ventilated to prevent dampness — a significant issue in many NZ homes.
Safety Note
⚠️ Always turn off the water supply at the isolation valve or the property toby before doing any work near water pipes. If you're unsure where your toby is, check near the front boundary of your property. Never attempt to work on pressurised pipes.
When to Call a Professional
You should engage a licensed plumber for:
- All connections to cold and hot water supply pipes
- Connecting the waste to your household drainage
- Any new drainage runs or alterations to existing drainage
- Situations where no isolation valves are present
- Any work you're not 100% confident is non-restricted
A licensed plumber will also issue you with a Certificate of Compliance for restricted work — an important document for your property records and insurance. You can find qualified local plumbers right here on tradedirectory.co.nz.