What a gasfitter does in New Zealand
A gasfitter is the tradesperson you hire to work on gas systems in a home or business. In New Zealand, gasfitting is not a casual DIY job: it is restricted work, and the person doing it must be properly authorised under the Plumbers, Gasfitters and Drainlayers Board (PGDB).
In practical terms, a gasfitter installs, commissions, maintains, tests, repairs and certifies gas appliances and pipework. That can include natural gas or LPG (bottled gas) systems, depending on your property and location. Their job is to make sure gas is delivered and used safely, with the right pressure, ventilation and flueing, and without leaks or carbon monoxide risks.
Gasfitters often work on the parts of a home that most homeowners don’t see:
- gas piping inside the house or underfloor - appliance connections and isolating valves - regulators and changeover valves - flues and ventilation for gas appliances - leak testing and pressure testing - commissioning new appliances after installation - issuing compliance documentation where required
Because gas is hazardous if installed incorrectly, a gasfitter’s work is about both performance and safety.
Common jobs a gasfitter is hired for
Homeowners usually call a gasfitter when they are installing, replacing or troubleshooting gas appliances or gas supply lines. Some of the most common jobs in New Zealand include:
- installing a gas cooktop, oven or hob - connecting a continuous-flow gas hot water system - replacing an old gas water heater - servicing or replacing a gas fireplace or space heater - converting between LPG and natural gas, where the appliance allows it - running new gas pipework for an extension, renovation or outdoor kitchen - fixing leaks, low pressure or ignition problems - checking appliances after renovations or earthquake repairs - disconnecting gas safely when an appliance is removed
A gasfitter may also be involved in larger projects such as multi-unit developments, rental property upgrades, or home conversions from electricity to gas, although these jobs often require coordination with plumbers, electricians, builders and the gas supplier.
What they actually do on site
A lot of homeowners know they need a gasfitter, but not what happens once one arrives. Typical tasks might include:
1. **Assessing the existing setup** The gasfitter checks what fuel supply you have, where the gas comes from, what appliances are installed, and whether the existing pipework, regulators and ventilation are suitable.
2. **Testing for safety** They may pressure-test pipework, check for leaks, inspect joints, and confirm that appliances are operating as intended.
3. **Installing or relocating pipework** This could involve routing gas lines through walls, under floors or externally, using approved materials and methods.
4. **Connecting appliances** The gasfitter makes the final gas connection and ensures the appliance is correctly set up for the correct gas type and pressure.
5. **Checking flues and ventilation** Many gas appliances need correct flueing to vent combustion products outside. The gasfitter checks that the appliance has enough ventilation and that the flue is installed correctly.
6. **Commissioning the appliance** They start it up, confirm it works safely, and check flame characteristics, ignition and controls.
7. **Explaining safe use** A good gasfitter will also explain any required maintenance, warning signs to watch for, and when the appliance should be serviced again.
Gasfitter vs plumber vs electrician
These trades can overlap in a renovation, which is why homeowners often mix them up. Here’s the simplest way to think about it:
| Trade | Main work | Typical overlap | |---|---|---| | Gasfitter | Gas pipework, gas appliances, leak testing, commissioning, flues | Often works with plumbers on water heating and with electricians on powered controls or ignition systems | | Plumber | Water supply, waste pipes, fixtures, hot water plumbing | May install parts of a hot water system, but gas connections need a gasfitter | | Electrician | Wiring, switchboards, power points, lighting, appliance electrics | Gas appliances may still need electrical connection for ignition, fans or controls |
In many homes, one project can require all three. For example, installing a new gas hot water system may involve:
- a plumber for water connections and drainage - a gasfitter for gas supply and appliance connection - an electrician for any powered controls, pumps or nearby electrical work
If the job touches wiring, remember that electrical work is regulated separately under the Electrical Workers Registration Board (EWRB). If it involves plumbing or gasfitting, the PGDB rules apply.
When you should call a gasfitter
You should contact a gasfitter if you are:
- installing a new gas appliance - changing location of a cooktop, heater or gas bottle setup - converting a kitchen, laundry or outdoor area to gas - smelling gas or suspecting a leak - experiencing poor appliance performance, yellow flames or repeated shutdowns - renovating and moving a kitchen or hot water system - replacing an old gas appliance that needs a new connection or flue - unsure whether your current gas setup is safe or compliant
If you smell gas, turn off the supply if it is safe to do so, avoid naked flames and sparks, ventilate the area, and contact the appropriate emergency or gas supplier line straight away. Do not operate switches or appliances if you suspect a significant leak.
For less urgent issues such as poor ignition, a burner going out, or a pilot light problem, a gasfitter can diagnose whether the fault is with the appliance, the gas supply, or ventilation.
What a gasfitter is qualified and authorised to do
In New Zealand, gasfitting is restricted work. That means the person doing the work must be licensed/authorised in the correct class, and they must follow the relevant safety and certification requirements.
A gasfitter can usually:
- install gas appliances and pipework they are authorised for - replace valves, regulators and components within their scope - pressure-test and leak-test gas installations - certify gasfitting work where required - identify whether a job needs additional trades or consent
They cannot legally just “have a go” if the work falls outside their authorisation. If a contractor tells you they can do everything without checking their licence status, that is a red flag.
For homeowners, the practical takeaway is simple: always ask for the gasfitter’s registration details and make sure they are authorised for the work you need. You can also check the PGDB register.
Projects that may also need council consent or extra approvals
Gasfitting itself is not the same thing as building work, but many gas projects sit inside a bigger renovation. That is where local council rules can come in.
You may need building consent, or other approvals, if the job involves:
- structural alterations to walls, floors or roofs - installing a flue through a roof or wall in a way that affects building compliance - major alterations to a kitchen, laundry or internal layout - creating a new external gas bottle enclosure or appliance space - adding a fireplace or altering the building envelope
You may also need to consider:
- tenancy rules if the property is rented - body corporate approval for apartments or shared buildings - gas supplier requirements for certain meter or connection changes - manufacturer instructions, which can be just as important as the plumbing/gasfitting rules
If you are combining gas work with a renovation, it’s wise to ask the gasfitter early whether your plans are likely to need council consent or another professional input. That can save costly rework later.
How gas systems differ around New Zealand
The kind of work a gasfitter does can vary depending on where you live and what fuel supply your home uses.
In many urban areas, homes may be connected to reticulated natural gas. In other places, especially where mains gas is not available, homes often rely on LPG cylinders. That affects:
- where appliances can be located - whether pipe sizing and pressure are different - how regulators and changeover systems are installed - whether the homeowner needs bottle storage outside
Climate also matters. In colder parts of the South Island, gas heating and hot water can be a more significant part of winter comfort and energy use. In warmer areas, gas may mainly be used for cooking or hot water. A good gasfitter will recommend a solution that suits the property, the household’s usage, and the local supply setup.
What a good gasfitter should provide
When you hire a gasfitter, you are not just paying for labour; you are paying for experience, compliance and documentation. A professional should be willing to provide:
- a clear written quote or estimate - their authorisation details and relevant licence/registration information - an explanation of what is included and excluded - advice on whether another trade is needed - certification or paperwork for the gas work completed, where applicable - manufacturer-compliant installation details for the appliance
For bigger jobs, ask whether the quote includes:
- removal and disposal of the old appliance - any new pipework, valves or fittings - flue materials and roof/wall penetrations - call-back for commissioning or final checks - after-hours or emergency call-out fees
The cheapest quote is not always the best value. For gas work, you want someone who is careful about safety, clear about compliance, and upfront about what extra work may be needed once they inspect the site.
How to compare quotes and choose the right person
It’s sensible to get at least two or three written quotes, especially for anything beyond a simple appliance swap. When comparing them, check:
- whether the gasfitter is properly authorised and registered - whether the quote names the exact appliance or scope of work - whether compliance testing and certification are included - whether extra work is likely if old pipework, ventilation or flues are not up to standard - whether the timing suits your renovation programme or cooking/heating needs
Ask practical questions such as:
- Have you done similar jobs in homes like mine? - Will this require a plumber, electrician or builder as well? - Is my existing gas supply suitable for the new appliance? - Are there any council or manufacturer requirements I should know about? - What happens if you find a leak, corrosion or non-compliant installation?
A trustworthy gasfitter will answer these questions clearly and won’t pressure you to skip checks.
The bottom line
A gasfitter does far more than connect a gas bottle or hook up a cooktop. They work on the safe installation, repair, testing and certification of gas systems and appliances, and their role is tightly regulated in New Zealand because the risks are serious.
If you’re renovating, replacing a heater or hot water system, or even just unsure whether your gas setup is safe, a licensed and appropriately authorised gasfitter is the right person to call. For most homeowners, the smartest approach is to get a written quote, confirm credentials, and check early whether the job also needs a plumber, electrician or council consent before work begins.