Moving a toilet might seem like a straightforward DIY job, but in New Zealand the law is clear: most of the work involved is restricted sanitary plumbing work that must be carried out by a licensed tradesperson. Understanding exactly where the legal line sits will save you from costly fines, failed inspections, and potential health hazards.
What Does NZ Law Say About Plumbing Work?
Under the Plumbers, Gasfitters, and Drainlayers Act 2006, sanitary plumbing and drainlaying are classified as restricted trades. This means that connecting, disconnecting, or altering any sanitary fixture — including a toilet — to the waste, soil, or water supply pipework must be done by a person who is registered and licensed with the Plumbers Gasfitters & Drainlayers Board (PGDB).
Carrying out restricted work without a licence is an offence that can result in significant fines. More importantly, unlicensed work can void your home insurance and create serious health and structural risks.
What Exactly Is Restricted Work When Moving a Toilet?
When you move a toilet, virtually every meaningful step touches restricted work:
- Disconnecting the toilet from the soil pipe (the waste outlet)
- Capping or extending the soil pipe to the new location
- Relocating the water supply connection to the cistern
- Connecting the toilet to the new waste and water supply points
- Any alterations to drainlaying (underground or in-slab pipework)
All of the above must be done by a licensed plumber or drainlayer. The PGDB website has a useful tool to verify a tradesperson's licence before you hire them.
What Can a Homeowner Do Themselves?
As a homeowner, you are legally permitted to do minor maintenance on your own home's plumbing — but the definition of minor is narrow. You may:
- Remove and refit the same toilet in the same location (e.g., to replace a broken pan or seat) without altering any pipework connections
- Replace a toilet seat or cistern internals (fill valve, flush valve) where no pipework is altered
- Turn off the water supply at the isolation valve before a licensed plumber arrives
You cannot legally move the toilet to a new position yourself, even if the new spot is only a few centimetres away, because this requires altering the waste pipework.
Does Moving a Toilet Require a Building Consent?
This depends on the scope of work. Minor like-for-like replacements in the same location are generally exempt from building consent under Schedule 1 of the Building Act 2004. However, moving a toilet to a new position — especially if it involves relocating drainage or altering the room layout — may well require a building consent from your local council.
The MBIE Building Performance website provides guidance on what work requires consent, but you should always confirm with your local council before starting, as interpretations can vary. Your licensed plumber can also advise based on the specific job.
NZ Building Code clauses relevant to toilet and sanitary work include:
- G12 (Water Supplies)
- G13 (Foul Water) — covering drainage gradients, venting, and trap requirements
Practical Considerations Before You Start Planning
Before you even call a plumber, it pays to think through a few things:
- Drainage gradient: Soil pipes need a minimum fall (typically 1:40 to 1:60) to drain correctly. Moving a toilet further from the main stack can make achieving the right gradient difficult, especially in a slab-on-ground home.
- Venting: NZ plumbing standards require soil pipes to be properly vented. Relocating a toilet may require a new vent stack or air admittance valve, adding to cost and complexity.
- Slab vs. timber floor: Moving a toilet in a concrete slab home is significantly more complex (and expensive) than in a home with a suspended timber floor, as the slab may need to be cut and reinstated.
- Existing pipework: Your plumber will need to assess what's already in the wall and floor before quoting.
How Much Does It Cost to Move a Toilet in NZ?
Costs vary widely depending on floor type, distance of the move, and your region. As a very rough guide, expect to pay more for slab work than for suspended-floor jobs, and more again if a building consent is required. Get at least two or three quotes from licensed plumbers. You can find qualified local plumbers on tradedirectory.co.nz.
When to Call a Professional
You should contact a licensed plumber before doing anything beyond basic planning. This is not optional — it is a legal requirement for all pipework alterations. A licensed plumber will:
- Assess the feasibility of your planned toilet location
- Advise on consent requirements and liaise with council if needed
- Carry out all restricted sanitary plumbing work to NZ Building Code standards
- Issue a Certificate of Compliance (sometimes called a producer statement) for the work, which is important for insurance and future property sales
If your project also involves moving walls or electrical work (e.g., relocating a heat lamp or exhaust fan), you may also need a Licensed Building Practitioner and a registered electrician licensed with the Electrical Workers Registration Board.
For healthy homes compliance in rental properties, check the requirements at Tenancy Services.
Safety note: Incorrectly installed sanitary plumbing can lead to sewer gas (including toxic hydrogen sulphide) entering your home, as well as contamination of your water supply. Never attempt restricted plumbing work yourself.