Can I install a new toilet myself in New Zealand?

You can remove an old toilet and prepare the area, but connecting to or modifying any water supply or drain pipework is restricted plumbing work under NZ law. It must be done by a licensed plumber registered with the PGDB. Doing it yourself risks non-compliance with the NZ Building Code and could void your home insurance.

Do I need a building consent to replace my toilet?

A straightforward like-for-like toilet replacement generally doesn't require a building consent. However, if you're changing the location of the toilet, installing a wall-hung system that involves altering wall framing or drainage, or making significant changes to the bathroom layout, you may need consent. Check with your local council before starting work.

What is a rough-in measurement and how do I find mine?

The rough-in is the distance from your finished wall to the centre of the floor drain outlet. Measure from the wall (not the skirting board) to the middle of the soil pipe. NZ homes commonly have a 180 mm or 230 mm rough-in. Always confirm this before purchasing a new pan to ensure it will align correctly with your drain.

Are wall-hung toilets harder to repair than standard suites?

Wall-hung cisterns are concealed inside the wall, so access for repairs requires either a built-in access panel or removing tiles — which can be costly. Quality in-wall cistern frames from reputable brands are designed for longevity and do include service access, but it's worth factoring in this consideration, especially in a busy family bathroom.

What WELS rating should I look for in a new toilet?

Look for a toilet with a 4-star WELS rating or higher. A high-rated dual-flush toilet uses considerably less water per flush than older models, saving money on water bills over time. The WELS star rating must be displayed on all toilets sold in NZ, so it's easy to compare models before you buy.

How to Choose a New Toilet in NZ: Suite, Wall-Hung & More

Replacing or upgrading a toilet is one of the most practical bathroom improvements you can make — but with so many styles, flushing systems and installation types on the market, it can feel overwhelming. This guide walks you through the main options available in New Zealand, what to consider before you buy, and where licensed help is essential.

The Three Main Toilet Types

Close-Coupled Suite

The close-coupled suite is the most common toilet in NZ homes. The cistern sits directly on top of the pan, making it a self-contained unit that's straightforward to install and easy to find replacement parts for. It suits most standard bathrooms and is generally the most affordable option.

Back-to-Wall

A back-to-wall toilet has the pan pushed flush against the wall or a furniture unit, with the cistern concealed inside a vanity cabinet or wall cavity. This gives a cleaner look than a close-coupled suite while being somewhat easier to install than a fully wall-hung model. Plumbing access is still required behind or beneath the unit.

Wall-Hung (Wall-Faced)

A wall-hung toilet has the pan suspended off the floor, with the cistern and frame (called an in-wall frame or carrier frame) fully concealed inside the wall cavity. This is the most contemporary look, makes floor cleaning a breeze, and allows you to set the pan height to suit the user. However, it requires a structurally sound wall, a compatible in-wall cistern frame, and more complex installation work.

Key Factors to Consider

Bathroom Size and Layout

Measure your bathroom carefully before choosing a style. MBIE Building Performance sets minimum clearance requirements under the NZ Building Code — generally at least 600 mm in front of the pan and adequate side clearances. Wall-hung models can visually open up a small bathroom because the floor is clear, even if the overall footprint is similar.

Water Efficiency (WELS Rating)

All toilets sold in NZ must carry a WELS (Water Efficiency Labelling and Standards) star rating. Look for a 4-star or higher dual-flush model — a good dual-flush toilet uses significantly less water per flush than older single-flush units, which matters for both your water bill and NZ's environmental goals. Check the WELS label on the box or product listing before you buy.

Rough-In Measurement

The rough-in is the distance from the finished wall to the centre of the soil pipe outlet in the floor. NZ homes most commonly have a 180 mm or 230 mm rough-in. Measure yours before shopping — buying the wrong size means the pan won't align with the drain, which is an expensive mistake.

Style and Finish

Consider the overall look of your bathroom. Close-coupled suites come in a wide range of styles from traditional to modern. Wall-hung and back-to-wall pans tend to suit contemporary, minimalist bathrooms. Most quality toilets are available in white vitreous china; some premium ranges offer other finishes.

Budget

As a broad guide only, close-coupled suites tend to be the most affordable, back-to-wall units sit in the mid range, and wall-hung systems (pan + in-wall frame + cistern) are typically the most expensive — and installation costs are higher too due to the additional labour and wall work involved. Get quotes from a licensed plumber before committing.

Comparing the Options at a Glance

Feature	Close-Coupled Suite	Back-to-Wall	Wall-Hung
Cistern location	On top of pan	Concealed in furniture/wall	Fully in-wall
Floor cleaning	Moderate	Easy	Very easy
Installation complexity	Low	Medium	High
Adjustable height	No	No	Yes
Relative cost (supply)	$	$$	$$$
Suits small bathrooms	Yes	Yes	Yes (visually)
Access for repairs	Easy	Moderate	Requires access panel

NZ Building Code and Compliance

Toilet installations in NZ must comply with NZ Building Code clause G12 (Water Supplies) and clause G13 (Foul Water). Any work that connects to or modifies the soil, waste or water supply pipework is restricted building work and must be carried out — or supervised — by a Licensed Building Practitioner or a licensed plumber registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB).

For rental properties, landlords must also ensure bathrooms meet the Healthy Homes Standards — including adequate ventilation. Check Tenancy Services for the current requirements.

What a Homeowner Can (and Can't) Do

You can generally:

Research and purchase the toilet suite yourself
Remove an existing toilet pan and cistern (once the water supply is isolated)
Clean up and prepare the area

You must NOT do yourself:

Connect or modify any soil pipe, drain or water supply pipework — this is restricted plumbing work under the Plumbers, Gasfitters and Drainlayers Act 2006
Install an in-wall cistern frame that involves cutting into structural elements (may also require a building consent)

Always check with your local council whether a building consent is required, particularly for wall-hung installations that involve altering wall framing or drainage.

When to Call a Professional

For any toilet installation beyond a simple like-for-like swap of a close-coupled suite, you should engage a licensed plumber. A qualified plumber will ensure the installation is watertight, correctly vented, and compliant with the NZ Building Code — protecting you from leaks, odours, and liability issues down the track. For wall-hung installations, you may also need a builder to construct or reinforce the wall cavity.

You can find qualified, vetted local plumbers on tradedirectory.co.nz to get the job done right.

How Do I Choose a New Toilet? Suite, Wall-Hung or Back-to-Wall Explained