Yes — replacing a showerhead is one of the few plumbing tasks that New Zealand homeowners can legally and safely do themselves. As long as you're simply swapping one showerhead for another on an existing shower arm, no licensed plumber is required and no building consent is needed. That said, there are a few important things to know before you grab a spanner.
What the Law Says About DIY Plumbing in NZ
Plumbing work in New Zealand is largely restricted work under the Plumbers, Gasfitters, and Drainlayers Act 2006. This means most plumbing must be carried out by (or under the supervision of) a licensed tradesperson registered with the Plumbers Gasfitters & Drainlayers Board (PGDB).
However, there is a clear exemption for minor maintenance and repairs that don't involve altering or extending the pipework. Replacing a showerhead on an existing shower arm falls into this category — you're not touching the water supply pipes, valves, or drainage, so it's perfectly legal to do it yourself.
If you're unsure whether your job qualifies as minor maintenance, the MBIE Building Performance website is a good starting point, and you can always ring your local council to confirm.
What You'll Need
The good news is that this is a straightforward job requiring only basic tools and materials:
- New showerhead (check the thread size — most NZ showers use a standard ½-inch BSP thread)
- Adjustable spanner or slip-joint pliers
- PTFE tape (thread seal tape)
- A cloth or rag to protect chrome finishes
- Mild cleaning spray (optional, to clean the shower arm first)
You'll find a wide range of showerheads at Bunnings, Mitre 10, and PlaceMakers, from basic fixed heads through to handheld and rail-mounted options.
Step-by-Step: How to Replace a Showerhead
1. Turn Off the Water (Optional but Recommended)
For a simple showerhead swap you don't always need to shut off the water supply — just make sure the shower mixer or taps are fully off. If you're at all unsure, turn off the isolating valve or the mains supply to be safe.
2. Remove the Old Showerhead
Wrap a cloth around the shower arm to protect it, then use your adjustable spanner to unscrew the old showerhead anticlockwise. It may be stiff if it hasn't been removed in years — steady pressure will do it.
3. Clean the Threads
Wipe down the shower arm threads and remove any old PTFE tape or mineral build-up. A small brush or old toothbrush works well here.
4. Apply PTFE Tape
Wrap PTFE tape clockwise around the shower arm threads — typically 3–5 times around. This creates a watertight seal and makes future removal easier.
5. Fit the New Showerhead
Screw the new showerhead on clockwise by hand first, then snug it up with your spanner. Don't overtighten — firm is enough. Avoid using excessive force on plastic fittings.
6. Test for Leaks
Turn the water back on and run the shower. Check around the connection point for any drips. If it leaks, turn off the water, remove the head, add more PTFE tape, and refit.
Choosing the Right Showerhead for NZ Conditions
New Zealand's Healthy Homes Standards don't specifically regulate showerheads, but water efficiency is worth considering — especially in areas with water restrictions like parts of Auckland, Canterbury, and Hawke's Bay.
Look for showerheads with a WELS (Water Efficiency Labelling and Standards) rating. A 3-star or higher WELS-rated showerhead can significantly reduce hot water use, which is good for both the environment and your power bill. Energywise has useful guidance on reducing household hot water energy use.
| WELS Stars | Flow Rate (approx.) | Typical Use |
|---|---|---|
| 1–2 stars | 9–12 L/min | Standard flow |
| 3 stars | 7–9 L/min | Water-efficient |
| 4–6 stars | Under 7 L/min | High efficiency |
When to Call a Professional
While swapping a showerhead is DIY-friendly, some related jobs must be done by a licensed plumber. Call a professional if:
- You need to move or extend the shower arm or alter any pipework
- You want to install a new shower from scratch (this is restricted work and may require a building consent — always check with your council)
- The shower mixer or valve needs replacing or repairing
- You discover leaking pipes inside the wall
- You're installing a thermostatic mixing valve (TMV) — required under NZ Building Code clause G12 for certain installations to prevent scalding
- You're working on a rental property and want to ensure full compliance
For any of these jobs, it's important to use a licensed plumber. You can find qualified local plumbers on tradedirectory.co.nz.
Safety note: Hot water scalding is a real risk, particularly for young children and elderly people. NZ Building Code clause G12 requires hot water at sanitary fixtures to be delivered at safe temperatures. If you have any concerns about your hot water temperature, speak to a licensed plumber.