Good news — replacing a shower hose and handset is one of the more straightforward bathroom jobs a NZ homeowner can tackle themselves. Because you're simply swapping like-for-like fittings on existing connections (no cutting into pipes, no soldering, no new water supply work), this job generally falls outside the definition of restricted sanitary plumbing work under the Plumbers, Gasfitters and Drainlayers Act 2006. That said, if anything looks more complex once you get started, it pays to stop and call a licensed plumber.
What Counts as Restricted Plumbing Work?
In New Zealand, restricted work — work that must be carried out by a licensed tradesperson registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB) — includes installing, altering, or repairing sanitary plumbing and drainlaying. However, simple maintenance tasks like replacing a showerhead, handset, or flexible hose on an existing outlet are generally considered routine maintenance that homeowners can do themselves.
If you're unsure whether your specific situation crosses into restricted work territory, check with the PGDB or a licensed plumber before you start.
What You'll Need
Before you begin, gather the following:
- Replacement shower hose (typically 1.5 m or 2 m; check your existing hose length)
- Replacement handset/showerhead (ensure the thread size matches — most NZ fittings use a standard ½-inch BSP thread)
- Adjustable spanner or groove-joint pliers
- PTFE tape (plumber's thread tape — available at Bunnings or Mitre 10)
- Soft cloth or rag (to protect chrome finishes)
Choosing the Right Hose and Handset
Shower hoses and handsets come in a wide range of styles and price points. When choosing:
- Check the thread size on your existing wall outlet (slide bar or fixed arm). Most NZ showers use a standard ½-inch BSP fitting, but confirm before buying.
- Match the hose length to your existing setup, or go slightly longer for more flexibility.
- Look for WELS-rated products — the Water Efficiency Labelling and Standards scheme rates water use. A higher WELS star rating means lower water use, which is better for your water bill and the environment. This aligns with Energywise guidance on saving water at home.
- Reputable brands are available at Bunnings, Mitre 10, and PlaceMakers.
Step-by-Step: How to Replace the Hose and Handset
1. Turn Off the Water
Turn off the shower mixer or tap fully. You don't need to isolate the water supply to the whole house for this job, but make sure the mixer is off before you start.
2. Remove the Old Hose
Unscrew the hose from both ends — the wall outlet (or slide bar outlet) and the handset. Turn anti-clockwise. Use a cloth-wrapped spanner if the fittings are stiff, to avoid scratching the chrome.
3. Clean the Threads
Wipe the threads on the wall outlet clean. Remove any old PTFE tape or debris.
4. Apply PTFE Tape
Wrap PTFE tape clockwise around the male threads (usually on the hose ends) — about 3–4 wraps is sufficient. This creates a watertight seal without over-tightening.
5. Attach the New Hose
Screw the new hose onto the wall outlet by hand first, then snug it up with a spanner — firm but not overtightened. Repeat at the handset end.
6. Test for Leaks
Turn the shower on and check both connection points carefully for drips. If you see a leak, turn off the water, dry the fitting, add another wrap of PTFE tape, and re-tighten slightly.
Common Issues to Watch For
| Issue | Likely Cause | Fix |
|---|---|---|
| Dripping at wall connection | Insufficient PTFE tape or loose fitting | Add tape, re-tighten |
| Hose won't unscrew | Mineral build-up | Soak with white vinegar or use penetrating oil |
| Wrong thread size | Non-standard fitting | Take old hose to store to match |
| Low water pressure after fitting | Flow restrictor in new handset | Check handset specs or remove restrictor |
Safety Note
Always make sure the shower mixer is fully off before starting. Water damage from a poorly fitted hose can be costly and may affect your home's compliance with the NZ Building Code requirements around weathertightness and moisture (particularly Clause E3 – Internal Moisture). If you notice any signs of existing leaks, corrosion, or damage to the wall outlet or pipes behind the wall, stop and call a licensed plumber.
When to Call a Professional
Call a licensed plumber (find one on tradedirectory.co.nz) if:
- The wall outlet is damaged, corroded, or needs replacing inside the wall cavity
- You need to move or add a water supply point
- There are signs of a leak behind the wall (soft tiles, mould, damp smell)
- You're installing a new shower system from scratch
- You're unsure at any point — it's always better to ask
For any restricted plumbing work, your tradesperson must be registered with the PGDB. You can verify their licence on the PGDB website.
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