You’ve got a van, a plumbing licence, a phone that rings, and you haven’t taken a proper holiday in six years. Your accountant says you turned over $650K last year. So your business must be worth something, right?
Maybe. But probably a lot less than you think — and possibly a lot more than you realise, depending on one question: have you built a business, or have you built yourself a job?
The Owner-Operator Gap
This is the single biggest factor in plumbing business valuations, and it creates an enormous spread. A sole trader with a van and a ute doing $500K in revenue — even with good margins — might sell for $50K-$100K above asset value. That’s essentially the cost of the tools, vehicle, and a small premium for the phone number and Google listing.
Meanwhile, a plumbing business with 8 staff, a maintenance contract book, ServiceM8 running the scheduling, and an office manager handling admin might sell for $400K-$800K in goodwill alone.
Same trade. Same licence. Completely different valuations.
The difference between a plumbing “job” and a plumbing “business” can be a 5x to 10x difference in sale price. The pivot point is almost always whether the owner is on the tools.
Maintenance Contracts: The Gold Standard
If you want to know what makes a buyer’s eyes light up, it’s a maintenance contract book. Strata management companies, commercial property managers, real estate agencies with rental portfolios, aged care facilities, schools — these recurring revenue sources are the single most valuable asset in a plumbing business.
Here’s why: a contract book with $200K in annual recurring maintenance revenue, even at modest margins, is predictable cash flow. A buyer can underwrite that. Compare it to $200K in one-off emergency call-outs — revenue that evaporates the moment you stop answering the phone.
Buyers will typically value a well-documented maintenance contract book at 1x-2x the annual contract revenue, depending on contract tenure and renewal history. That means your $200K contract book might add $200K-$400K to your sale price on its own.
Key detail: the contracts need to be with the business entity, not with you personally. If the strata manager calls your mobile and the arrangement is a handshake, that’s not a transferable contract — it’s a relationship that walks out the door with you.
The Plumber Shortage Is Driving Acquisitions
Australia is short roughly 50,000 trade workers, and plumbing is one of the most affected trades. This shortage is reshaping the acquisition market in a specific way: larger plumbing groups and facility management companies are buying smaller businesses not for the revenue, but for the licensed plumbers.
This means an acqui-hire dynamic exists. If you have 4-5 licensed plumbers on staff who would stay post-sale, that retention value can push your multiple higher than the financials alone would justify. Buyers will often structure earn-outs or retention bonuses specifically around keeping your team.
Licence Transferability: The WA Complication
In most Australian states, a plumbing contractor licence is held by an individual, not a company. When you sell your business, the buyer needs their own licence — or needs to employ a licensed plumber as a nominated supervisor.
In Western Australia, the Plumbers Licensing Board has specific requirements around this that can complicate sales. The buyer must hold (or employ someone who holds) the relevant licence classes before they can operate. There’s no grace period where they can trade on your licence post-settlement.
This creates a practical constraint: your buyer pool is limited to people who either hold a plumbing contractor licence themselves or have one lined up. For larger businesses being acquired by corporate buyers, this usually means retaining a licensed supervisor as part of the deal — which brings us back to team retention.
If your plumbing licence is the only one in the business, you’ve created a key-person dependency that directly limits who can buy you.
Real Margins: What the ATO Data Shows
The ATO publishes small business benchmarks based on actual tax return data from plumbing businesses across Australia. Here’s what the 2023-24 benchmarks show:
| Annual Turnover | Total Expenses / Turnover | Avg Expenses | Implied Net Margin |
|---|---|---|---|
| $50K - $150K | 50% - 66% | 58% | 34% - 50% |
| $150K - $600K | 59% - 74% | 66% | 26% - 41% |
| $600K+ | 75% - 86% | 80% | 14% - 25% |
The cost breakdown is revealing too. For businesses over $600K turnover, cost of sales runs 29-38% of revenue, labour 23-33%, and motor vehicle expenses 3-5%.
What this means for valuations: a plumbing business turning over $800K with total expenses at 80% (the ATO average for that band) is generating ~$160K in pre-tax profit. At a 3-5x EBITDA multiple, that’s $480K-$800K in business value — before you add vehicles and equipment.
Buyers will compare your actual ratios against these ATO benchmarks. If your expenses are above the benchmark range, they’ll ask why. If below, they’ll want to understand whether that’s sustainable or whether you’ve been underinvesting.
They’ll also look at:
- Labour efficiency — revenue per plumber per day ($1,200-$1,800 is a good benchmark for residential)
- Average job value — trending upward is good, trending down suggests pricing pressure
- Quote conversion rate — quoting a lot and winning little means margins are being squeezed
- Warranty and callback rate — high callbacks destroy margin and signal quality issues
The Systemisation Premium
Buyers will pay materially more for a plumbing business running proper job management software — ServiceM8, Tradify, simPRO, or Fergus — than one running on paper dockets and a whiteboard.
This isn’t about the software itself. It’s about what the software implies: that jobs are tracked, costs are allocated, invoices go out on time, customer history is recorded, and the business can be understood by someone who isn’t you.
A plumbing business with 3 years of clean data in ServiceM8 — showing job profitability, technician performance, and customer retention — is presenting a buyer with evidence. A business running on the owner’s memory and a shoebox of receipts is presenting a buyer with risk.
Fleet: The Hidden Cost Bomb
Buyers will inspect your fleet carefully. A van with 280,000km on the clock isn’t an asset — it’s a liability. Budget $60K-$80K per fully fitted plumbing van, and buyers will mentally deduct that for any vehicle nearing replacement.
The same goes for specialist equipment — jetting machines, CCTV drain cameras, pipe locators. If your $30K jetter is 8 years old, a buyer is pricing in a replacement. Well-maintained, recently purchased equipment adds confidence. Ageing equipment adds negotiation leverage — for the buyer.
What Your Business Might Actually Be Worth
| Business Profile | Likely Goodwill Range |
|---|---|
| Owner-operator, no contracts, 1 van | $30K - $80K |
| 2-4 staff, some maintenance work, basic systems | $100K - $250K |
| 5-10 staff, solid contract book, job management software | $250K - $600K |
| 10+ staff, diversified contracts, manager-run | $500K - $1.2M+ |
These are goodwill figures — plant, equipment, and vehicles are additional, valued separately.
Who Buys Plumbing Businesses?
The acquisition market for plumbing businesses has shifted significantly over the past five years. Understanding who is buying — and why — helps you position your business and set realistic expectations.
Larger plumbing groups consolidating are the most active acquirers. A business doing $3-5M in revenue with 15-20 staff is often looking to bolt on a $500K-$1.5M operation to expand geographic coverage or add a service line (e.g., adding gas fitting or roofing to a drain-focused business). These buyers move fast, understand the trade, and typically want you to stay for a 6-12 month transition.
Facility management companies like Programmed, Broadspectrum, and similar national operators acquire plumbing businesses to bring subcontracted work in-house. If you hold maintenance contracts with large property portfolios, government agencies, or strata networks, these buyers see your contract book as immediate revenue they can fold into their existing operations. They pay well for sticky contracts.
PE-backed trade services roll-ups have become increasingly active in Australia. These platforms acquire multiple trade businesses — plumbing, electrical, HVAC — and consolidate them under shared back-office functions. They typically target businesses with $150K+ EBITDA and a team that will stay post-sale. Expect structured deals with earn-out components tied to retention and revenue targets.
Individual licensed plumbers stepping up from employee to owner represent the traditional buyer. A senior plumber with 15 years of experience, a contractor licence, and some savings wants to skip the startup phase and buy an established operation. These buyers are hands-on, understand the work, and are often the best cultural fit for smaller businesses.
The acqui-hire dynamic is real and growing. With the trade shortage showing no signs of easing, buyers will pay a genuine premium for a business that comes with 5-10 licensed plumbers who are likely to stay. In some transactions we have seen, the implied value of the team exceeds the value justified by the financials alone. If you have a stable, skilled team, that is one of your strongest selling points.
Google Reviews and Online Reputation
For residential plumbing businesses, your Google Business Profile is a genuine marketing asset — and buyers know it. A profile with 4.5+ stars and 200 or more reviews represents years of accumulated trust that a new entrant simply cannot replicate quickly.
Buyers evaluating residential plumbing businesses will check your Google reviews early in the process. A strong review profile signals consistent service quality, reduces the marketing spend a new owner needs to maintain call volume, and provides social proof that survives the ownership transition.
Conversely, a thin or mediocre review profile (below 4.0 stars or under 50 reviews) tells a buyer they will need to invest in reputation building from day one. Some buyers specifically look for businesses where improving the online presence represents an easy growth lever — but they will price accordingly.
If you are 12-18 months from selling, actively encouraging satisfied customers to leave Google reviews is one of the highest-ROI activities you can undertake. It costs nothing and directly supports your asking price.
Related Reading
- How Much Is My Business Worth? — a general guide to Australian business valuations
- How Much Is My Construction Business Worth? — valuations for a related trade
- Preparing Your Business for Sale — what to do before going to market
Getting Ready
The best time to start preparing is 18-24 months before you want to sell. Get off the tools. Build your contract book. Get your financials onto accrual accounting. Make sure your team is licensed, retained, and not planning to leave.
Run a quick estimate with our valuation calculator, or contact us directly for a confidential assessment of your plumbing business.