NIGEL GORDON
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WHS Due Diligence When Buying a Trades Business in Australia

Nigel Gordon·
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When you buy a trades business in Australia, the Work Health and Safety obligations come with it. Not some of them. All of them. The day you settle, you become the person responsible for every ladder that hasn't been inspected, every chemical stored incorrectly, and every Safe Work Method Statement that's never actually been written down.

Most buyers doing due diligence check the financials, review the contracts, maybe look at staff entitlements. WHS is usually an afterthought — or skipped entirely. That's a mistake that can cost you far more than the business earns.

This is Module 5 territory (confirmatory due diligence), and it's covered in detail in the Playbook. But here's the practical version: what to actually check, how to get the information out of a seller, and what to do when you find problems.

Why WHS obligations transfer on settlement

In Australia, work health and safety law applies to whoever is running the business — not whoever used to run it. Under the Work Health and Safety Act 2011 (and its state equivalents), the "person conducting a business or undertaking" (PCBU) carries the primary duty of care. When you settle, you become the PCBU.

This matters because:

  • Outstanding improvement notices from SafeWork don't disappear at settlement
  • Prohibition orders on equipment remain in force
  • Workers' compensation claims in progress become your liability to manage
  • Any non-compliant practices the previous owner let slide are now your problem

I've seen buyers discover, three weeks after settlement, that a particular piece of plant had been the subject of a SafeWork investigation that the seller "forgot to mention." The business was cheap for a reason.

The rule of thumb that actually holds: any WHS liability that existed before settlement is the seller's problem in theory — but you're the one managing it in practice. Build that into how you think about price.

What to request from the seller

A reasonable seller of a legitimate trades business will be able to provide all of this. If they can't, or won't, that tells you something.

SafeWork compliance history

Ask for any notices received in the past five years — improvement notices, prohibition orders, enforceable undertakings. A single improvement notice that was properly remediated isn't alarming; a pattern of notices, or one that's still open, is a different conversation.

You can also do your own search. SafeWork NSW publishes a register of enforceable undertakings. WorkSafe Victoria and SafeWork SA have similar public records. It takes about ten minutes and it's free.

WorkCover / workers' compensation claims history

Request a claims summary for the past three to five years. What you're looking for:

  • Frequency of claims (once or twice is normal; four claims in two years in a small team is not)
  • Whether any claims are still open
  • Your likely WorkCover premium as new owner — this is calculated partly on claims history

A business with a string of serious injury claims will carry a higher workers' comp premium than one with a clean record. That's a direct hit to profitability. Make sure you understand what you're inheriting before you finalise price.

Equipment compliance records

In a trades business — plumbing, electrical, HVAC, landscaping, painting — you'll typically have a mix of plant and equipment that carries specific compliance requirements. Ask for:

  • Test-and-tag records for electrical equipment
  • Scaffolding inspection certificates and safe work records
  • Plant registration for anything that requires it (elevated work platforms, certain forklifts, pressure vessels)
  • Recent inspection records for vehicles used in the business

A plumbing business I looked at recently had three pressure test kits with expired calibration certificates and a gas detection unit that hadn't been tested in two years. None of it was expensive to fix. But it meant the business was technically non-compliant at the point of sale, and the seller's price hadn't accounted for it.

Safe Work Method Statements (SWMS)

Trades businesses are required to have SWMS for high-risk construction work. The list of what counts as "high-risk" is longer than most people expect — it includes work involving demolition, electrical risks, work at height, and work in confined spaces, among other things.

Ask to see the current SWMS library. If the seller says "the guys know what to do," that's not a SWMS. That's an absence of documentation.

The risk to you as a buyer: an undocumented process becomes your liability the moment a worker is injured performing it. Having proper SWMS in place before you take over is far easier than retrofitting them after an incident.

Training records and licences

Certain trades require specific licences — electrical work, gas fitting, scaffolding erection above certain heights. Confirm that every staff member who's doing licensed work actually holds the relevant licence, and that those licences are current.

Also look at high-risk work licences (HRWLs) for things like elevated work platforms, rigging, and pressure equipment operation. If a key operator leaves post-settlement, you need to know how hard it'll be to replace them. In some regional areas, finding someone with the right HRWL can take months.

The environmental angle that most buyers miss

In trades businesses that handle chemicals — pest control, cleaning, some painting and surface treatment work — there's a WHS/environmental overlap that catches buyers off guard.

Check:

  • How hazardous chemicals are stored and labelled
  • Whether Safety Data Sheets (SDS) are current and accessible
  • Waste disposal records — particularly for anything classified as hazardous waste
  • Whether any site has been subject to a remediation notice

Pest control businesses in particular carry real chemical compliance obligations. I've seen a pest control acquisition where the previous owner had been disposing of expired chemical product in ways that were, to put it diplomatically, not consistent with EPA guidelines. The remediation cost sat with the buyer.

This overlaps with insurance due diligence — check your insurance due diligence process to make sure environmental liability coverage is part of that conversation.

How to price WHS deficiencies into your offer

Finding WHS gaps doesn't have to kill a deal — it just needs to be priced properly. The approach:

  1. Get quotes for remediation. Test-and-tag for a whole fleet of equipment, scaffolding inspection, rewriting SWMS — these are tangible costs you can price.

  2. Estimate the premium uplift. If the business has a poor WorkCover claims history, get a quote from the insurer before you sign. The premium difference between a clean record and a poor one can be tens of thousands of dollars annually.

  3. Negotiate a price adjustment. Frame it as: "I've found X, Y, and Z that require remediation at a cost of approximately $Z,000. I'd like to adjust the purchase price accordingly." This is a much cleaner conversation than walking away — and sellers usually expect some renegotiation after due diligence.

  4. Seek a warranty. Ask the seller to warrant that there are no outstanding notices, claims, or investigations not disclosed in due diligence. Your solicitor can draft this into the SPA.

This is exactly the kind of thing covered in the due diligence renegotiation checklist if you want a structured framework.

Should you hire a WHS consultant for due diligence?

For a business under $300,000 — probably not, unless there are obvious red flags. A checklist-based review of the documents above is usually sufficient, and you're relying on seller warranties for the rest.

For a business above $500,000 with a significant workforce (10+ staff) or high-risk work activities: yes, bring in a specialist. A WHS consultant doing a one-day site assessment will cost you $1,500–$3,000. If they save you from buying a business with an active WorkSafe investigation, that's a very good return.

The middle ground — businesses between $300K and $500K with moderate complexity — comes down to your own comfort level and what the documents look like. If the seller can't produce test-and-tag records or SWMS for high-risk work, that's a gap that probably warrants specialist eyes.

Connecting WHS to your broader due diligence

WHS doesn't sit in isolation. It connects to almost every other part of the process:

  • Employee entitlements: if staff have been underpaid, they may have been pushed to work faster, creating WHS risk. See the employee entitlements due diligence article.
  • Operational systems: businesses with poor process documentation often have poor WHS documentation too. Check your operational due diligence alongside this.
  • Insurance: WHS claims history directly affects your premiums. Run WHS and insurance due diligence together.

For the full picture, the due diligence checklist covers all of these areas in one place.

FAQ

Do WHS obligations transfer when I buy a business as an asset sale?

Yes. An asset sale doesn't change the fact that you're taking over the operations. You become the PCBU on settlement day regardless of the sale structure. The difference is that in a share sale, you also inherit any legal proceedings already commenced — so share sales carry slightly more WHS risk than asset sales.

What are the red flags in WHS due diligence?

Open prohibition orders, multiple WorkCover claims in short succession, missing or outdated SWMS for high-risk work, unlicensed staff doing licensed work, and equipment with no inspection records. Any one of these is worth a conversation; more than two is a pricing or walk-away decision.

Can I inherit someone else's debt when buying a business in Australia?

In an asset sale, generally no — you're buying assets, not taking on the seller's debts. But WHS penalties and ongoing WorkSafe investigations aren't "debts" in the traditional sense — they're regulatory matters that follow the activity, not the legal entity. Get your solicitor to clarify exactly what warranties and indemnities the seller is providing.

What is a SWMS and why does it matter?

A Safe Work Method Statement is a document that identifies high-risk construction work, the hazards involved, and the controls in place to manage those hazards. It's not optional for high-risk work — it's a legal requirement. If a worker is injured on a job where a SWMS should have existed and didn't, the PCBU (you, post-settlement) is exposed to significant penalties.

How much does WHS remediation typically cost in a trades business?

It varies widely. Test-and-tag for a team of 10 with typical equipment might cost $500–$1,500. Rewriting a full SWMS library with a consultant might run $2,000–$5,000. Workers' comp premium uplift from a poor claims record can be $10,000+ annually. Equipment that needs certification or replacement can range from a few hundred to tens of thousands, depending on what it is.

The short version

WHS due diligence is non-negotiable for any trades business acquisition. The day you settle, every obligation transfers. Ask for SafeWork compliance history, WorkCover claims records, equipment certification, current SWMS, and staff licence records. Price what you find into the offer. Get warranties in the SPA.

If you're in the middle of a due diligence process on a small business, WHS should be on the list alongside financials, contracts, and staff. Not after them.

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