Gas Fitter Insurance: Additional Cover You Might Need

·12 min read

Why Gas Fitters Need Extra Insurance

If you’re a licensed gas fitter, your Public Liability (PL) insurance probably covers the basics — third-party property damage, personal injury at a worksite. But gas fitting introduces a layer of risk that standard trade insurance often doesn’t touch.

Gas leaks, carbon monoxide poisoning, compliance failures, and even explosions are all real-world consequences of gas work gone wrong. And when standard PL policies have exclusions for these risks, you’re left exposed.

Key point: A standard Public Liability policy for plumbers typically covers water damage and general injury claims. It may not cover claims arising from gas-specific work unless you have the right endorsement or standalone cover.

The good news? The extra cover you need is usually not expensive — often an additional $10 to $30 per month on top of your PL policy. The bad news? Not knowing you need it until a claim is denied can cost you tens of thousands.

In this article, you’ll learn what extra insurance gas fitters should consider, what standard PL policies typically exclude for gas work, and how to make sure you’re properly covered without paying for cover you don’t need.

Gas-Specific Risks That Standard PL Doesn’t Always Cover

Gas Leaks and Explosions

A slow gas leak from a poorly fitted connection might not cause damage for weeks or months. When it finally does — whether through an explosion, fire, or health impact on occupants — the claim can run into the hundreds of thousands of dollars.

Standard PL policies often have exclusions for “gradual” damage or pollution-related claims. A gas leak that causes harm over time might fall into this category. Some policies also exclude damage from fire or explosion if it results from gas work specifically.

Real claim example: A gas fitter in Queensland replaced a cooktop in a rental property in 2024. A loose flare nut caused a slow leak that went undetected for six weeks. The eventual explosion caused $180,000 in property damage and injured two tenants. The fitter’s standard PL policy initially declined cover because the policy excluded “gradual escape of gas.” After legal proceedings, the insurer settled, but the fitter’s premiums tripled and his renewal was conditional on a gas endorsement.

Whether your insurer covers gas-related explosion claims depends on the specific wording of your policy. You need to check whether “gradual release of pollutants” or similar exclusion language applies to gas escapes.

Carbon Monoxide Poisoning

Carbon monoxide (CO) is odourless, colourless, and deadly. Faulty installation or servicing of gas appliances — heaters, hot water systems, cooktops — can produce CO that accumulates in confined spaces.

CO poisoning claims are particularly expensive because they often involve:

Check your policy: Many standard PL policies treat CO exposure as a pollution or contamination event, which may be excluded or subject to a sub-limit. Ask your insurer directly whether CO-related claims from gas appliance work are covered.

Compliance and Certification Failures

As a gas fitter, you issue compliance certificates for the work you do. If that work is later found to be non-compliant — whether due to an oversight, a faulty part, or an error in judgment — and someone is injured or property is damaged as a result, your PL policy should respond.

But here’s the catch: some policies exclude liability arising from “professional advice or certification.” That’s typically the domain of Professional Indemnity (PI) insurance, not PL.

If you’re signing off on gas compliance certificates without PI cover, you’re taking a risk that your PL policy may not back you up on.

Type A vs Type B Gas Appliance Work: Why It Matters for Insurance

Type A Appliance Work

Type A covers most common gas appliances you’ll work on: cooktops, ovens, space heaters, water heaters, and ducted heating systems. These run on natural gas or LP gas at consumer-level supply pressures.

From an insurance perspective, Type A work is generally covered under a standard trade PL policy with a gas endorsement. Most insurers are comfortable with this risk because it’s well-understood and heavily regulated.

Type B Appliance Work

Type B covers industrial and commercial gas appliances with complex burner systems — think large boilers, kilns, furnaces, or any appliance that consumes more than 10 MJ/h of gas. This work involves higher pressures, larger gas volumes, and significantly greater risk.

Important: If you do Type B gas work, a standard gas endorsement on your PL policy may not be enough. You likely need a policy that explicitly covers industrial gas fitting. Tell your insurer upfront about the type of gas work you do — failing to disclose this could void your cover entirely.

Insurers that cover Type B work are fewer, and premiums are higher. Expect to pay more — potentially double or triple a standard PL premium — depending on the proportion of Type B work in your business.

Gas Compliance Certificates and PI Insurance

Every time you issue a gas compliance certificate, you’re making a professional statement: that the work meets Australian Standards and is safe. If that turns out to be wrong, the liability can fall on you.

When PL Covers Compliance Errors

If your work causes physical damage or injury — say a gas leak from a poorly tightened fitting causes a fire — your PL policy should cover the resulting property damage and personal injury.

When PL Doesn’t Cover Compliance Errors

If your compliance certificate itself causes financial loss — for example, a property sale falls through because your certificate is found to be invalid, costing the vendor thousands — that’s a pure financial loss. Most PL policies exclude pure financial loss. That’s where PI insurance comes in.

Scenario: You certify a gas installation for a new apartment building. Six months later, a building inspector finds the gas work non-compliant. The builder has to redo the work and delays settlement by two months. The builder claims against you for $60,000 in delay costs and rectification. Your PL insurer says “pure financial loss, not covered.” If you have PI insurance, it responds.

For more on PI insurance and when gas fitters need it, see our article on Professional Indemnity for plumbers.

What Standard PL Policies Typically Exclude for Gas Work

Every insurer has their own policy wording, but here are common exclusions you should look for in your PL policy:

Gradual or Continuous Exposure

Policies often exclude damage caused by “gradual or continuous exposure to conditions.” A gas leak that causes harm over weeks or months can fall into this exclusion.

Pollution and Contamination

Many policies contain a pollution exclusion. Carbon monoxide exposure, gas leaks into soil or water, and even the smell of gas (mercaptan) causing nuisance claims can all be caught by this exclusion.

Work on Gas Appliances Not Listed

Some trade policies cover “plumbing work” but do not define gas fitting as part of that scope. If the policy schedule only lists “plumber” and not “gas fitter,” you may not be covered for gas work at all.

Subcontractor Gas Work

If you subcontract gas work to another fitter and they make a mistake, your PL policy may not cover you for their negligence — even if you’re the one the client sues. You may need to ensure your subcontractors have their own insurance or that your policy includes vicarious liability for subcontractors.

Don’t assume: Always read the exclusions section of your policy. If you’re unsure whether something is covered, ask your insurer in writing. A verbal assurance on the phone won’t help you when a claim is denied.

Specialist Gas Fitter Insurers vs General Trade Insurance

General Trade Insurers

Companies that offer trade insurance to a broad range of occupations — electricians, carpenters, plumbers — often include gas fitting as a checkbox add-on. The product is standardised, the application is quick, and the price is competitive.

The downside: claims handlers at general trade insurers may not understand the nuances of gas fitting work. When a complex gas-related claim lands, you might find yourself explaining basic gas fitting concepts to someone who’s never heard of a compliance plate.

Specialist Gas Fitter Insurers

A handful of insurers and underwriters focus specifically on plumbing and gas fitting. Their policies are more likely to include gas-specific cover as standard, and their claims teams understand the trade.

The trade-off: specialist policies often cost more and may require more detailed underwriting information — including what proportion of your work is gas, whether you do Type B, and your claims history.

Which Should You Choose?

If you do mostly plumbing with occasional gas work, a general trade policy with a gas endorsement will usually suffice — provided you confirm the exclusions don’t leave gaps.

If gas fitting is a significant part of your business or you do Type B work, a specialist policy is worth the extra cost. The difference could be the difference between a claim being paid or declined.

You can compare both options through a broker or an online comparison service. BizCover is one platform that lets you compare trade insurance policies from multiple insurers, including those that offer gas endorsements — though you should always check that the policy you choose specifically covers your gas work.

Bundling Gas Cover With Your PL Policy

Adding gas cover to your existing PL policy is usually the cheapest and simplest option. Here’s what to expect.

The Endorsement Approach

Most insurers offer a “gas fitting endorsement” that bolts onto your PL policy. This adds cover for gas-specific risks that the base policy excludes. The cost uplift is typically modest:

Cost guide: A gas endorsement on a standard PL policy for plumbers typically adds $10 to $30 per month, depending on your turnover, claims history, and the proportion of gas work you do. For Type B gas fitters, the uplift can be $40 to $80 per month or more. This is a general range only — your actual premium will depend on your specific circumstances and the insurer’s underwriting criteria.

What to Check Before Adding an Endorsement

Before you tick the “gas endorsement” box, ask your insurer:

  1. Does this cover both Type A and Type B gas work?
  2. Are CO exposure and gas leak claims covered, or are they excluded as pollution?
  3. Does the endorsement cover compliance certificate liability, or do I need PI for that?
  4. Is there a sub-limit on gas-related claims?
  5. Are my subcontractors’ gas work covered under my policy?

Getting the answers in writing is the safest approach.

State Gas Licensing and Insurance Requirements

Your state gas licensing body sets minimum insurance requirements, and they vary.

New South Wales

NSW Fair Trading requires licensed gas fitters to hold at least $5 million in PL insurance. This applies whether you hold a contractor licence or a qualified supervisor certificate (where you’re working as a sole trader). You’ll need to provide a certificate of currency when applying for or renewing your licence.

Victoria

The Victorian Building Authority (VBA) requires registered gas fitters to hold PL insurance. The VBA’s minimum prescribed amount for plumbing and gas fitting work is $5 million. As of 2026, the VBA has been increasing its audit activity, and failure to maintain insurance can result in suspension of your registration.

Queensland

The Queensland Building and Construction Commission (QBCC) requires gas fitters (as part of plumbing and draining licences) to hold PL insurance. Minimum amounts depend on your annual turnover:

The QBCC also requires you to notify them if your insurance is cancelled or lapses.

Other States

In Western Australia, South Australia, Tasmania, the ACT, and the Northern Territory, gas fitters are typically required to hold PL insurance as a condition of their licence or registration. Minimum amounts generally range from $2 million to $5 million. Check with your state’s licensing body for current requirements — they can change, and the penalties for being uninsured can include fines and licence suspension.

For a detailed breakdown of insurance requirements across all states, see our article on plumber insurance requirements by state.

Understanding what can go wrong helps you understand what cover you need. Here are examples based on claims scenarios that insurers have reported (specific details have been generalised).

The Undetected Leak

A gas fitter installed a new gas hot water system in a Melbourne home. The connection to the gas line had a minor defect that caused an intermittent leak. Over four months, gas accumulated in the wall cavity. When the homeowner lit a candle, the resulting explosion blew out two walls and caused $245,000 in damage.

The fitter’s PL policy had a pollution exclusion. The insurer initially declined the claim on the basis that the gas escape constituted pollution. The fitter and homeowner challenged this, and the insurer eventually paid — but only after eight months of legal argument. A gas endorsement that explicitly covered gas escape would have avoided the dispute.

The CO Tragedy

In regional Victoria, a gas fitter serviced a faulty wall furnace but did not identify a cracked heat exchanger. The family of four experienced CO poisoning over several weeks. Two children required ongoing medical treatment. The claim exceeded $1 million in medical costs, lost income, and pain and suffering.

The fitter had PL insurance, but the policy had a contamination sub-limit of $250,000. The remaining $750,000-plus was a gap the fitter had to cover personally, resulting in bankruptcy.

The Compliance Certificate Error

A Sydney gas fitter issued a compliance certificate for a new apartment’s gas cooktop installation. The cooktop was installed with incorrect clearances to combustible surfaces. A fire started 18 months later, traced back to the clearance issue. The insurer for the apartment building pursued the gas fitter for $320,000.

The fitter’s PL policy covered the property damage from the fire, but the owners’ corporation also claimed $85,000 in investigation and legal costs — pure financial loss. Without PI insurance, the fitter had to pay these costs personally.

How Much Extra Cover Costs

Adding gas-specific cover to your insurance isn’t a major expense. Here’s what the market looked like in 2026.

Ballpark figures for a sole trader plumber adding gas cover:

  • Standard PL policy (no gas): approximately $50 to $80 per month
  • PL with gas endorsement (Type A only): approximately $65 to $110 per month
  • PL with gas endorsement (Type A + B): approximately $90 to $160 per month

These are indicative ranges only. Your actual premium depends on your turnover, location, claims history, the insurer’s appetite for gas risk, and how you present your business at underwriting.

The uplift for gas cover is typically small enough that the question isn’t really “can I afford it?” — it’s “can I afford a claim without it?”

What to Look for in a Gas Fitter Insurance Policy

When you’re comparing policies for gas fitting work, go beyond the premium and look at these specifics:

Wording That Explicitly Includes Gas Work

The policy should name “gas fitting” or “gas fitting work” in the description of your business activities. If it only says “plumber” or “plumbing,” ask whether gas work is automatically included.

No Gas-Specific Exclusions

Read the exclusions section carefully. Look for:

Adequate Limit of Indemnity

For gas work, a $5 million PL limit is the minimum you should carry. The damage from a gas explosion can easily exceed a $2 million policy limit. The slight increase in premium for a $5 million limit over $2 million is negligible compared to the protection.

Run-Off Cover for Retirement

If you plan to retire or close your business, check whether your policy includes run-off cover. Gas work you did years ago can give rise to a claim years later — a slow leak from a fitting you installed in 2026 might not cause a problem until 2028 or beyond.

Practical Steps to Get the Right Cover

  1. Audit your work. What proportion of your income comes from gas fitting? Do you do Type A, Type B, or both?
  2. Review your current policy. Find the exclusions section and read it. Look for anything that could apply to gas work.
  3. Ask your insurer specific questions. Don’t ask “am I covered for gas?” Ask: “If I install a gas cooktop and there’s a leak six months later that causes property damage, is that covered?”
  4. Get it in writing. If your insurer tells you something is covered, ask for the specific policy clause that provides the cover.
  5. Compare multiple quotes. Prices for the same cover can vary significantly between insurers. BizCover lets you compare quotes from multiple insurers online, which can save you time — just make sure the policy you select explicitly includes gas fitting work.
  6. Consider bundling. Adding gas cover to your existing PL policy is usually cheaper than a standalone gas policy. But standalone cover might give you more comprehensive protection if gas is your primary trade.

Frequently Asked Questions

Does my standard plumber PL insurance automatically cover gas fitting?

Not necessarily. Some policies include gas fitting under the definition of “plumbing work,” but many do not. Check your policy schedule and the description of your insured activities. If it doesn’t explicitly mention gas fitting, ask your insurer to confirm cover in writing.

What’s the difference between Type A and Type B gas appliance cover?

Type A cover relates to standard domestic and light commercial gas appliances (cooktops, heaters, hot water systems). Type B relates to industrial appliances with complex burners (boilers, kilns, furnaces). Insurers charge more for Type B cover because the risks are higher — larger gas volumes, higher pressures, and more catastrophic failure scenarios. If you do any Type B work, tell your insurer. Failing to disclose it could void your entire policy.

I only do occasional gas work. Do I really need extra cover?

If you’re doing gas work, you need cover for gas work — even if it’s occasional. A gas leak from one cooktop installation can cause as much damage as a leak from a commercial boiler room. The risk is in the nature of the work, not the frequency. If you genuinely only do a handful of gas jobs per year, some insurers may offer a lower premium. Ask.

Look in your policy’s exclusions section for terms like “pollution,” “contamination,” “gradual release,” “escape of substances,” or “hazardous materials.” If any of these are excluded, ask your insurer whether a gas leak or CO exposure would fall under the exclusion. If they say no, ask for the policy clause that covers it.

What happens if I work without gas insurance and something goes wrong?

If a claim arises from gas work and your insurance doesn’t cover it, you’re personally liable for the full cost. This can mean paying damages from your personal assets, including your home, savings, and future income. In serious cases involving injury or death, the financial exposure can run into millions. You could also face disciplinary action from your state licensing body, including suspension or cancellation of your licence. The cost of getting proper cover is trivial compared to the cost of not having it.

Disclosure: This article contains general information only. It does not constitute financial advice. You should read the relevant Product Disclosure Statement (PDS) before making any insurance decision. plumberinsurance.au may earn a commission from BizCover if you purchase a policy through the links on this page. This does not affect the price you pay.

Quote