You built this business from the tools up. You know the difference between a genuine buyer and someone who will use your PGDB licence register as a negotiating weapon. You've probably been "nearly ready" to sell for a few years — not because you lack resolve, but because you haven't yet seen a path that doesn't end with your team restructured and your business absorbed into someone else's brand.
This guide is written for owners in that position. It won't tell you to "maximise value" in vague terms. It will tell you specifically how licensed plumbing, drainage and infrastructure services businesses are bought and valued in New Zealand right now — and how to find a buyer who is actually worth dealing with.
Why Plumbing and Drainage Businesses Attract Serious Buyers
Plumbing and drainage is essential services infrastructure. It doesn't go away in a recession. Councils cannot defer water mains. Hospitals cannot defer sanitary systems. Developers cannot build without drainage consent. That baseline demand — steady, contractual, non-discretionary — is exactly what well-capitalised buyers look for.
Beyond demand stability, the PGDB licensing regime creates a genuine barrier to entry. You cannot stand up a competing business overnight. The Plumbers, Gasfitters and Drainlayers Board requires tradespeople to hold individual licences across gasfitting, drainlaying and plumbing — and those take years to earn. A competitor cannot simply hire their way to capacity in your region. That barrier is real, and sophisticated buyers price it in.
Revenue mix matters enormously. A business with council term maintenance contracts, Watercare Auckland approved contractor status, or school and hospital service agreements is a fundamentally different asset than one running on residential callouts. Watercare's procurement pipeline is substantial — and existing approved contractor relationships are difficult to replicate. If your business has that status, it carries a genuine premium.
PGDB Licensing and What It Means for Your Sale
This is where many plumbing business sales get complicated, and where sellers get caught unprepared.
PGDB licences are personal. They attach to the individual, not the company. When a buyer acquires your business — whether as a share sale or asset sale — they are not acquiring licences. They are acquiring a business that employs licensed people. The distinction matters enormously.
Every informed buyer will build a licence map before signing anything. They will identify which individuals hold which licences across plumbing, gasfitting and drainlaying, and assess what happens if any of those people leave post-settlement. If you are the Responsible Person — the licence holder who signs off regulated work — that is not just an HR question, it is a deal structure question. A buyer may require you to stay for a transition period, or may insist on licence continuity provisions before they will proceed.
The practical steps here are straightforward: pull your team's licence register from the PGDB database before you go to market. Know who holds what, when licences expire, and whether any are due for renewal. Identify your most critical licence holders — particularly anyone who signs off gasfitting or high-risk drainage work — and think honestly about their retention risk. Long-term employment agreements with those individuals, entered before any sale process begins, will significantly improve your negotiating position. A buyer who cannot verify licence continuity will either reduce price or walk away.
If you are the sole Responsible Person and you intend to exit fully, address this before you go to market, not during due diligence.
How Plumbing and Drainage Businesses Are Valued in NZ
Plumbing and drainage businesses in New Zealand typically sell at EBIT multiples between 3x and 5x, with significant variation based on revenue quality and business structure.
The highest multiples go to businesses with a high proportion of recurring, contracted revenue — council maintenance agreements, Watercare relationships, school or DHB service contracts. These are predictable, often multi-year, and they de-risk the business for a buyer. The lowest multiples go to businesses heavily dependent on residential callouts, owner relationships, or single large clients without documented renewal terms.
Tangible assets matter in this sector in a way they don't in, say, a consulting practice. Your fleet, CCTV pipe inspection cameras, excavation equipment, water jet blasters — these are real assets that a buyer needs to operate the business. They will be valued separately, and a well-maintained, documented fleet improves both the asset value and the buyer's confidence in the business's operational discipline.
The common pitfalls: owner remuneration not normalised; aged debtors that suggest poor billing discipline; verbal agreements with council clients that look like relationships but don't look like contracts; and equipment that is off the books or held in a related entity. Each of these is a discount factor in a buyer's model.
Infrastructure Tailwinds — Why the Timing Is Favourable
New Zealand's water infrastructure is in a documented state of deferred maintenance, and that is creating sustained forward demand for established operators.
The Wellington Water crisis of 2023–24 brought aging pipe networks to national attention. Burst mains, contamination events, and the cost of reactive rather than planned maintenance made front-page news for months. That crisis put water infrastructure on every council's capital expenditure priority list — not just Wellington's.
The government's Local Water Done Well policy (2024) — the successor to Three Waters — retains a strong focus on infrastructure investment through council-owned or council-controlled entities. Whatever the structural arrangement, the pipes still need replacing. The forward spending commitment is real.
The NZ Infrastructure Commission (Te Waihanga) publishes a national infrastructure pipeline. It gives buyers and their advisers forward demand visibility across roading, water, housing and community assets. If your business is positioned to capture that work — through existing council relationships, approved contractor status, or regional concentration — a buyer with access to Te Waihanga data will model that pipeline into their valuation.
Regional demand is uneven but persistent. Christchurch's post-earthquake rebuild still has years of underground infrastructure work remaining. Queenstown's growth is outpacing its drainage and water capacity. Auckland's sewer and stormwater upgrade backlog is well documented. If you operate in one of these corridors, say so clearly in any information memorandum.
What the Right Buyer Looks Like — and How to Identify the Wrong One
Three buyer types dominate the NZ market for businesses at your scale.
Trade roll-ups are the most common. They are often well-resourced and can move fast, but their model depends on integrating your business into a larger platform — standardising systems, rebadging vehicles, centralising management. Your team may keep their jobs. Your brand almost certainly won't survive.
Private equity-backed buyers are interested in growth platforms and financial engineering. They will offer a headline number, structure an earn-out, and plan to exit in five to seven years. The earn-out will be conditional on metrics that may not reflect how you actually run the business. Their loyalty is to their fund cycle, not to your team.
The third model — less common in NZ, but increasingly available — is the permanent holding company model. In Scandinavia, groups like Indutrade and Addtech have held licensed technical service businesses for thirty or more years. No planned exit. No rebranding. No integration into a larger platform. The business continues to operate under its own name, with its own management, with the owner's exit completed cleanly.
NZ owners now have access to this type of acquirer through PermaTech. PermaTech's acquisition of Tubman Heating — a licensed heating and gas trade business in New Zealand — demonstrates this model in practice: the business retained its identity, its people, and its operational independence post-acquisition. That is not a theoretical promise; it is a completed transaction.
When meeting any buyer, ask three questions: What is your hold period? What happens to our brand? And can you show me a business you have owned for more than ten years and introduce me to the management team still running it?
Preparing for Sale — Practical Checklist
Give yourself twelve months minimum. These are not administrative tasks — they are value-protecting actions.
- Financials. Three years of clean, accountant-prepared financials with owner remuneration normalised.
- PGDB licence register. Document every licence held by every staff member: licence type, number, expiry date, and the work they are authorised to sign off. Know your gaps before a buyer finds them.
- Job management system. A documented system — Simpro, Fergus, or similar — shows a buyer the business can be operated without you.
- Recurring contracts. Every council agreement, school contract, Watercare relationship and maintenance agreement should be in writing with documented renewal terms.
- Fleet and equipment register. Current, maintained asset register with purchase dates, service histories and valuations.
- WorkSafe NZ compliance documentation. Trenching, confined spaces, excavation — your SSSP documents, toolbox meeting records, and incident registers should be current.
- Aged debtors. Debtors over 90 days will be discounted or excluded. Collect what you can before you go to market.
If you have been nearly ready for three years, the checklist above is the reason to move now. Infrastructure demand in New Zealand is as strong as it has been in a generation. The buyers who understand licensed trade businesses — and who will pay appropriately for them — are active in the market.
If you would like to have a direct, confidential conversation about what your business is worth and what a sale might look like, PermaTech talks to NZ trade business owners regularly. No brokers, no obligations, no pressure.