You can install click-lock flooring in a bathroom yourself in many cases — but success depends heavily on choosing the right product, preparing the subfloor properly, and understanding where the NZ Building Code draws the line on wet-area waterproofing. Get these things right and you'll have a durable, good-looking floor. Get them wrong and you could be facing swollen boards, mould, or a costly re-do within a year or two.
Choosing the Right Click-Lock Product for a Bathroom
Not all click-lock flooring is suitable for wet areas. Standard laminate flooring — even with a water-resistant surface — is generally not appropriate for bathrooms because the core swells when moisture gets into the joints or underneath.
For bathrooms, look for:
- 100% waterproof SPC (Stone Plastic Composite) or WPC (Wood Plastic Composite) click-lock planks — these have a rigid, waterproof core that won't swell.
- Luxury Vinyl Plank (LVP) with a waterproof core and a wear layer of at least 0.3 mm (12 mil) for residential use.
- Products that are specifically rated by the manufacturer for wet areas or bathrooms — always check the technical data sheet.
Avoid standard HDF-core laminate in bathrooms, even if the salesperson says it's "water resistant." Water resistant is not the same as waterproof.
You'll find a range of suitable SPC and LVP products at Bunnings and Mitre 10, and flooring specialists can advise on brands suited to NZ conditions.
NZ Building Code and Wet-Area Waterproofing
This is the most important section to read carefully. Under Clause E3 (Internal Moisture) of the NZ Building Code, wet areas — including shower zones and areas around baths — must be waterproofed. Click-lock flooring, no matter how waterproof the planks themselves are, is not a substitute for a compliant wet-area membrane.
Here's how it typically breaks down:
| Area | Waterproofing required? | Click-lock flooring suitable? |
|---|---|---|
| Shower floor and walls | Yes — membrane required | No — tile or sheet vinyl preferred |
| Bath surround / splash zone | Yes — membrane or sealant required | Generally no |
| General bathroom floor (outside shower) | Moisture management required | Yes, with waterproof SPC/LVP |
| Toilet / laundry (low splash) | Good practice | Yes, with waterproof SPC/LVP |
For the shower recess itself, you should use a fully tanked system (membrane under tiles, or a prefabricated shower base). Click-lock planks are best suited to the general floor area outside the shower and bath zones.
Check with MBIE Building Performance or your local council if you're unsure whether your bathroom renovation requires a building consent. Many like-for-like flooring replacements fall under Schedule 1 exemptions, but always confirm — rules vary by council and scope of work.
Subfloor Preparation
A flat, dry, and stable subfloor is essential. Click-lock flooring is unforgiving of humps and hollows — most manufacturers specify a tolerance of no more than 3 mm over a 1.8 m span.
- Check for moisture: Use a moisture meter on timber subfloors. Elevated moisture readings mean you need to find and fix the source before laying anything.
- Level the subfloor: Use a suitable floor-levelling compound (brands like Ardex or Mapei offer products suited to wet areas) to fill low spots.
- Fix any squeaks or movement: Screw down any loose sheets or boards.
- Remove existing vinyl carefully: If there's old vinyl with possible asbestos-containing adhesive (common in NZ homes built before the late 1980s), do not sand or grind it. Seek advice from WorkSafe NZ on safe handling.
How to Install Click-Lock Flooring in a Bathroom
Tools you'll need
- Tape measure and pencil
- Pull bar and tapping block
- Utility knife or jigsaw
- Spacers (for expansion gaps)
- Rubber mallet
Key installation steps
- Acclimate the flooring in the room for 24–48 hours (check manufacturer's instructions).
- Plan your layout so you don't end up with very narrow strips at the walls.
- Leave an expansion gap of at least 8–10 mm around all walls and fixed objects — bathrooms experience temperature and humidity swings.
- Click planks together following the manufacturer's method — most use an angle-and-press or fold-down system.
- Cut around toilet bases and vanity pedestals carefully with a jigsaw.
- Seal all perimeter gaps with a mould-resistant silicone sealant (not a gap filler) before fitting skirting or scotia. This is important in bathrooms to stop water tracking under the floor.
- Fit transition strips at doorways.
Do not glue down a floating click-lock floor — it needs to move freely as a floating system.
When to Call a Professional
Call a qualified flooring installer if:
- Your subfloor has significant moisture problems, rot, or structural issues.
- You're unsure whether your project needs a building consent.
- The existing floor has suspected asbestos-containing materials.
- You want flooring installed inside a shower recess or as part of a full bathroom renovation involving plumbing changes.
Any plumbing work — moving or connecting drains, waste pipes, or water supply — is restricted work under the Plumbers, Gasfitters, and Drainlayers Act and must be carried out by a licensed tradesperson registered with the Plumbers Gasfitters & Drainlayers Board. Similarly, any electrical work must be done by a registered electrician — check the Electrical Workers Registration Board.
You can find experienced local flooring installers on tradedirectory.co.nz who can advise on the best approach for your specific bathroom.
