The short answer is: no, not legally. In New Zealand, installing, connecting, or modifying an LPG manifold system is classified as restricted gasfitting work and must be carried out by a licensed gasfitter. Attempting to do this work yourself — even on your own property — is illegal and potentially life-threatening.
Why LPG Work Is Restricted in New Zealand
Under the Gas Act 1992 and its regulations, gasfitting work is tightly controlled to protect public safety. The Plumbers, Gasfitters and Drainlayers Board (PGDB) oversees licensing and enforcement. Restricted gasfitting work includes:
- Connecting or disconnecting gas appliances to a supply line
- Installing, modifying, or repairing gas pipework
- Installing or connecting a manifold system (which links two or more LPG cylinders)
- Any work on regulators, valves, or fittings that form part of the gas supply system
If you carry out restricted work without a licence, you could face significant fines, your home insurance may be voided, and — most critically — you put yourself and your household at serious risk of gas leaks, fire, or explosion.
What Is a Manifold System?
A manifold system connects two or more LPG cylinders together so that gas is drawn from both simultaneously, or automatically switches to a full bottle when one runs empty. These systems are common in homes that rely heavily on LPG for cooking, hot water, or heating. While the concept seems straightforward, the connections, regulators, and changeover valves involved are all part of the gas supply system — and therefore restricted work.
What a Homeowner CAN Legally Do
There are a few limited tasks you can do yourself without a licence:
- Swapping an empty LPG cylinder for a full one, provided the connection type is unchanged and you are simply reconnecting to an existing, compliant fitting
- Turning the gas supply on or off at the cylinder valve
- Reporting a suspected gas leak — if you smell gas, turn off the supply at the cylinder, ventilate the area, and call your gas supplier or a licensed gasfitter immediately
Everything beyond these basic tasks — including adding a second bottle, installing a manifold, or changing regulators — must be done by a licensed professional.
Cylinder Placement and Safety Requirements
Even the physical placement of LPG cylinders is governed by rules. Under the NZ Building Code and relevant standards, LPG cylinders must be:
- Located outdoors in a well-ventilated area
- Kept a minimum distance from ignition sources, windows, doors, and drains (your gasfitter will know the exact clearances required)
- Secured upright and protected from physical damage
- Installed with compliant regulators and pressure relief provisions
For guidance on building compliance, MBIE Building Performance is a useful starting point, though your licensed gasfitter will ensure the installation meets all relevant standards.
Does Adding a Second Bottle Need a Building Consent?
This depends on the scope of work. Minor like-for-like replacements may fall under Schedule 1 exemptions of the Building Act, but adding a manifold system or changing the configuration of your gas supply is more likely to require a building consent. Always check with your local council before starting any work — and remember, your licensed gasfitter can advise you on this too.
How Much Does It Cost to Have a Gasfitter Do This?
As a rough guide, having a licensed gasfitter supply and install a two-bottle manifold system typically costs somewhere in the range of a few hundred dollars, depending on your location, the complexity of the installation, and the equipment required. Get at least two or three quotes to compare.
When to Call a Professional
You should always call a licensed gasfitter for:
- Installing or modifying any LPG manifold or multi-cylinder setup
- Changing regulators or pressure settings
- Extending or modifying gas pipework
- Any gas work following a leak, damage, or appliance change
- Annual or periodic safety checks of your gas system
You can find qualified, licensed gasfitters in your area right here on tradedirectory.co.nz. Always ask to see their current PGDB licence before work begins — you can verify a gasfitter's licence status on the PGDB website.
Safety Note
LPG is heavier than air and can pool in low-lying areas, creating an invisible explosion risk. Never use a naked flame to check for leaks. If you suspect a gas leak, leave the area, avoid operating any electrical switches, and call your gas supplier or emergency services. For broader safety guidance, refer to WorkSafe NZ.
Sources & Further Reading
- Plumbers, Gasfitters and Drainlayers Board (PGDB) — licence verification and restricted work information
- MBIE Building Performance — NZ Building Code and consent guidance
- WorkSafe NZ — hazardous substances and gas safety
- Licensed Building Practitioners — for broader building work compliance
- BRANZ — building research and best practice guidance