Yes, you can absolutely replace a toilet seat yourself in New Zealand – no building consent, no licensed tradesperson, and no special tools are required. It's one of the most beginner-friendly home maintenance tasks around, and with the right seat and a few minutes, you'll have it sorted.
Is It Restricted Work?
Under New Zealand law, plumbing work that involves connecting or disconnecting pipes, altering sanitary plumbing, or working on drainlaying is restricted work that must be carried out by a licensed tradesperson registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB). However, simply swapping a toilet seat involves no pipework, no water connections, and no drainage – it is purely a mechanical fixture change. This means it sits well outside restricted work rules and is perfectly legal for any homeowner to do themselves.
What You'll Need
Before you head to the hardware store, gather the following:
- Measuring tape – to measure your toilet pan
- New toilet seat – matched to your pan shape and size
- Adjustable spanner or pliers – for stubborn nuts
- Screwdriver – usually a flathead or Phillips
- Cleaning cloth and mild cleaner – to clean the pan before fitting
You'll find a good range of toilet seats at Bunnings and Mitre 10, as well as plumbing merchants and bathroom retailers across NZ.
Choosing the Right Toilet Seat
Not all toilet seats are interchangeable, so it pays to measure up before you buy.
Pan Shape
Most NZ toilets have one of two pan shapes:
- Round/standard – shorter front-to-back measurement
- Elongated/D-shape – longer, more oval shape
Key Measurements
Use a tape measure and note down:
| Measurement | Where to Measure |
|---|---|
| Length | Front edge to centre of bolt holes at the back |
| Width | Widest point of the pan |
| Bolt hole spacing | Distance between the two hinge bolt holes |
Standard NZ bolt hole spacing is typically around 150 mm apart, but always confirm on your specific toilet before purchasing.
Seat Material and Features
Toilet seats come in a range of materials and styles:
- Plastic (polypropylene) – affordable, lightweight, easy to clean
- Soft-close – hinges slow the lid down to prevent slamming; great for families
- Quick-release – hinges click off for easy cleaning
- Thermoplastic or duroplast – heavier, more durable, often found in higher-end seats
For rental properties, landlords should also be aware of Healthy Homes Standards requirements around maintaining sanitary facilities in good working order.
How to Remove the Old Seat
- Lift the hinge covers at the back of the seat – these usually flip up or prise off with a flathead screwdriver.
- Unscrew the bolts – most are plastic wing nuts you can undo by hand from underneath the pan. If they're corroded or stiff, use pliers or an adjustable spanner.
- Lift the old seat away and set it aside for disposal.
- Clean the pan thoroughly around the hinge area before fitting the new seat – this is the perfect opportunity.
How to Fit the New Seat
- Thread the new bolts down through the hinge holes on the seat, then through the mounting holes on the pan.
- Attach the nuts from underneath – hand-tighten first, then snug them up with pliers. Don't overtighten – you can crack a ceramic pan.
- Snap the hinge covers back into place.
- Check alignment – the seat should sit centred on the pan and open and close smoothly.
- Test the soft-close or quick-release function if applicable, following the manufacturer's instructions.
The whole job typically takes 10–20 minutes.
Disposal of the Old Seat
Most old toilet seats can go in your general rubbish, but check with your local council for any specific guidance. Some councils offer inorganic kerbside collections where bulkier items can be left out.
When to Call a Professional
While the seat swap itself is DIY-friendly, call a licensed plumber if you notice any of the following during the job:
- Cracks in the ceramic pan – a cracked toilet can leak and cause water damage or injury
- Loose or rocking toilet – the pan may not be properly secured to the floor, which can involve the pan connector and drainlaying (restricted work)
- Leaking at the base or cistern – any water supply or drainage connections must be handled by a PGDB-registered plumber
- Corroded or damaged flush fittings – internal cistern work may stray into restricted territory
For any of these issues, you can find a qualified local plumber on tradedirectory.co.nz.
Safety Note
Always turn off the water supply to the cistern before doing any work near the toilet, even for a seat swap – it's a good habit. The isolation valve is usually located on the wall or floor behind the toilet. If you're unsure, turn off the water at the toby (main stopcock).