What Plumbing Work You Can DIY vs What Needs a Registered Plumber

Why Are There Plumbing Regulations in New Zealand?

New Zealand's plumbing regulations exist for a reason: to protect your home and your family. Poorly executed plumbing work can lead to leaks, water contamination, and even structural damage. That’s why the Building Act 2004 outlines specific rules for who can carry out plumbing work and ensures that critical tasks are left to licensed professionals.

Failing to comply with these regulations can result in fines, voided insurance, or worse - serious safety risks to your family.

Plumbing Tasks You Can DIY

The good news? You don’t need a license for every plumbing job. New Zealand homeowners are permitted to handle some minor plumbing tasks that don’t interfere with mains systems or involve specialist knowledge. 

Here are some tasks homeowners can safely and legally DIY:

Fixing or Replacing Tap Washers
Got a dripping tap? This simple fix involves turning off the water supply, removing the tap handle, and replacing the worn washer. It’s a straightforward task that can stop water waste and reduce your utility bills.
 

Installing or Replacing Showerheads

Swapping out an old showerhead for a new one can instantly refresh your bathroom. With a few basic tools, you can unscrew the existing fitting and replace it with an upgraded option. Just ensure the connection is secure to prevent leaks.

 

Unblocking Drains

A blocked drain doesn’t always require a plumber. You can tackle minor clogs using plungers, drain snakes, or eco-friendly cleaners. However, avoid harsh chemical drain cleaners as they can damage pipes over time. If the blockage persists, it’s time to call a professional.

 

Repairing Garden Irrigation Systems

Adjusting or repairing garden watering systems is allowed, provided they don’t connect directly to the mains water supply. This could include replacing a broken sprinkler head or fixing leaks in hose attachments. Always ensure your changes don’t compromise water pressure or flow.

 

Replacing a Toilet Seat

This is one of the simplest DIY plumbing tasks. All it takes is unscrewing the old seat and securely attaching the new one. Since it doesn’t involve any water connections, it’s a perfect beginner project.

Even for these minor tasks, it’s important to use quality tools and components to ensure the repairs are effective and long-lasting. If you’re ever in doubt, consult an expert or visit your local Chesters branch for advice and supplies.

Plumbing Tasks That Require a Registered Plumber

When it comes to more complex jobs, New Zealand law is clear: you must hire a licensed plumber. These professionals have the training, skills, and certifications required to carry out work safely and to regulatory standards. Attempting these tasks yourself could not only be unsafe but also lead to hefty fines, insurance issues, or severe damage to your property.

Here’s a breakdown of the tasks you must leave to the experts:

Installing or Altering Mains Pipework
Any work on the pipes that connect your home to the mains water supply, waste systems, or sewer lines requires professional expertise. This includes installing new pipework, repairing leaks, or extending existing systems. Mistakes in this area can result in water contamination or serious damage to your home.
 

Hot Water Cylinder Installation or Repairs
Working on hot water cylinders involves precise pressure management and safety mechanisms. Improper installation or repair can lead to scalding, system failures, or even explosions. Licensed plumbers are trained to handle these systems safely.

 

Gasfitting Work
Gasfitting, such as installing gas water heaters or repairing gas pipelines, is strictly regulated. This work must be carried out by a certified professional to avoid potentially life-threatening risks like gas leaks or explosions.

 

Drainage Work
Beyond clearing minor blockages, any work on underground drainage systems—including installation, repair, or rerouting—must be performed by a registered plumber or drainlayer. These tasks often involve specialised equipment and knowledge of building codes.

 

Backflow Prevention Devices

Backflow prevention is critical for maintaining clean and safe drinking water. Installing or servicing these devices requires technical skills to ensure they meet regulatory standards and effectively prevent contamination of the water supply

Ignoring these requirements isn’t just a legal issue - it can result in unsafe outcomes, significant repair costs, and potential health risks for you and your family. Always choose a registered plumber for these complex jobs to ensure peace of mind and compliance with New Zealand regulations.

How to Find a Registered Plumber in New Zealand

If you need a professional, finding a registered plumber is straightforward:

• Check the New Zealand Plumbers, Gasfitters, and Drainlayers Board for licensed tradespeople.
• Ask for references or reviews to ensure the plumber has a good track record.

At Chesters, we work closely with trusted plumbers across New Zealand and can help connect you with the right professional for your needs.

Tips for Working with a Plumber

To make your plumber’s visit as smooth as possible:

1. Clearly explain the issue or project scope.
2. Turn off the water supply if there’s a leak before their arrival.
3. Request a detailed quote and timeline upfront.

A collaborative approach ensures the best results for your home.

Knowing the difference between what you can do yourself and what requires a registered plumber is key to keeping your home safe and compliant with New Zealand regulations. Chesters has been supporting homeowners and tradespeople across New Zealand for more than 50 years. We stock everything from essential plumbing supplies to stylish front-of-wall solutions like tapware, vanities, and showers. Plus, our knowledgeable staff are always on hand to offer advice or recommend a trusted plumber near you.

The information provided on this page is correct to the best of our knowledge at the time of publication (25/11/24). However, regulations, standards, and laws may change over time. We recommend verifying all details and accessing the most up-to-date information by visiting the relevant official websites provided in the links above. For further clarification, please contact the appropriate regulatory authority or consult a licensed professional.