Ask the question out loud and you will get an answer within about four seconds. Somewhere between three and eight times profit, rising into double digits if the business is good enough. The figure is confident, widely repeated — and often the wrong benchmark for a UK HVAC business.
The problem is not necessarily the number. It is the market behind it. Much of the valuation content that appears in search results comes from US advisers describing a US market. A UK buyer is operating in a different market, with different transaction data, financing conditions and sector benchmarks.
The short answer: most UK HVAC and installation businesses are valued primarily on a multiple of adjusted EBITDA rather than turnover. UK mid-market data puts construction and engineering firms towards the lower end of sector tables, while businesses with a substantial contracted maintenance book can be benchmarked more like technical building services and facilities management, where multiples are higher.
This article is about how that number is constructed — and, more importantly, what you can change before a buyer ever sees your accounts. It is a companion to our piece on what actually makes an HVAC business sellable, which deals with readiness rather than arithmetic.
Why US HVAC valuation multiples can mislead UK owners
US advisers describing their own market report founder-owned HVAC businesses trading in a range of roughly three to eight times EBITDA as bolt-on acquisitions, with private equity paying double-digit and sometimes mid-teens multiples for larger platform businesses carrying substantial recurring revenue. Those figures are real. They describe a different market.
The UK mid-market looks different. Dealsuite surveys several hundred UK and Ireland advisory firms working on businesses between £1m and £200m of revenue, and its all-sector average EBITDA multiple has sat in the region of five times for several years. More relevant to an installation business, construction and engineering has repeatedly come in at or near the bottom of its sector table — in one edition at 3.3 times against a 5.1 all-sector average.
So the mistake is not reading American data. The mistake is treating it as a UK benchmark. A UK owner who builds expectations around US multiples can interpret a normal domestic offer as an insult when the underlying market is simply different.
The same principle applies across Europe. Dealsuite has reported UK and Ireland construction and engineering multiples materially below the equivalent figure in the DACH region. Who you sell to can therefore influence the valuation as well as what you have built.
What type of HVAC business is a buyer actually valuing?
This is the part that matters more than any single multiple. Before an adviser or acquirer selects a comparable multiple, they decide what kind of business you are.
| Category | What it describes | How it is typically rated |
| Construction and engineering | Project-led work, won job by job, delivered and invoiced | Historically one of the lowest-rated categories in UK mid-market tables |
| Business services | Ongoing commercial relationships with some contracted element | Consistently rated above construction in the same surveys |
| Facilities management and technical building services | Contracted, compliance-led and recurring | UK sector analysis has put facilities management in a range around four and a half to six times EBITDA, with continuing private equity interest and consolidation |
BDO has also documented investors building consolidated platforms across compliance-led, recurring-revenue trades including HVAC.
You are not permanently assigned to one of these categories. Your revenue mix helps determine which benchmark a buyer reads you against.
A business that is 80% project installation is likely to be benchmarked against the lower-rated project-led category. The same business, with the same engineers, vans and region, but a substantial and well-priced maintenance book can start to look like technical building services.
That is not just a marginal improvement in the multiple. It can be a change of category.
This is why building contracted maintenance revenue should be treated as a valuation project, not simply a service-department initiative. Recurring revenue changes the earnings profile and can change how the whole business is perceived by a buyer.
Where UK business valuation data actually comes from
Three sources carry much of the weight in the UK mid-market:
- BVB, published through the ICAEW — transaction multiples for UK private companies across eleven sectors and more than forty sub-sectors.
- Dealsuite — surveys UK and Ireland advisory firms twice a year.
- MarktoMarket — publishes UK valuation indices built from private-company transaction data, including breakdowns by deal size.
Each has limitations. ICAEW guidance stresses that valuation indices are starting points rather than valuations, that methodologies differ and that some indices exclude loss-making businesses, which can push reported averages above the level at which the whole market trades. It also notes changes in access to other private-company valuation data.
Read published multiples as a spread, not a target. A single decimal place does not make a valuation precise.
What is normalised EBITDA — and why isn’t it the profit in your accounts?
The multiple gets most of the attention. The number underneath it can move the answer more.
Buyers do not simply value the profit shown in your statutory accounts. Those accounts were prepared for financial reporting and tax purposes and may contain owner remuneration, personal expenditure, unusual professional fees and other items that need to be considered differently from a buyer’s perspective.
The buyer is asking a different question: what would this business earn under a new owner paying market rates for everything, with nothing in the figures that will not repeat? That restated figure is normalised or adjusted EBITDA, and the journey from one to the other is set out in the EBITDA bridge.
The important point is that normalisation is not a licence to make the profit look better. It is an attempt to establish sustainable, transferable earnings.
Which EBITDA add-backs survive due diligence?
Every owner arrives at a sale process with a list of costs that are ‘not really business costs’. Some survive. Others disappear in the first week of diligence. Because each accepted add-back is multiplied by the valuation multiple, the difference can be substantial.
The test is simple: an add-back is a claim that a cost disappears when you do. If it will still be there after completion, it is not an add-back.
| Usually survive | Usually do not |
| Owner remuneration and dividends restated to the market salary for the role a successor would perform | ‘Exceptional’ items that recur |
| Genuinely one-off professional fees | Owner labour that a buyer would have to replace with a paid employee |
| Personal vehicles, travel and subscriptions run through the company | Repairs and maintenance that are really deferred capital expenditure |
| Family members on payroll who do not work in the business | Van replacement in a rolling fleet |
| Property rent restated to market rate where premises are owned by the seller personally | Tooling, calibration, accreditation and engineer training required to operate the business |
| Van stock write-offs that are really a working-capital issue |
Installation businesses can lose ground here because genuinely lumpy costs are tempting to label exceptional. A buyer’s accountant will generally look across the cycle and normalise recurring requirements.
How company size affects your valuation multiple
Size can affect the multiple independently of quality, and the effect is documented in UK transaction data. Dealsuite has examined a small-firm premium across UK SMEs in the £200,000 to £5m EBITDA band. MarktoMarket has made a similar observation from transaction data, with the multiple differential between size bands helping explain the economics behind buy-and-build strategies.
For a seller, this matters because a consolidator may be buying an asset that can be integrated into a larger platform. The buyer is not only comparing your EBITDA with a published multiple; it is considering the strategic value of what your business adds to its existing platform.
That can influence negotiation, but it does not mean the seller automatically receives the buyer’s platform multiple. The quality and transferability of what you are handing over still matter.
What moves an HVAC business up or down the multiple range?
Once the category and size band are understood, a handful of business characteristics help determine where in the range you land.
Customer concentration. If two clients account for a third of revenue, the buyer is pricing the risk that either one leaves.
Owner dependency. If estimating logic, pricing decisions and key relationships live in the owner’s head, the buyer is acquiring a business whose margin discipline may leave with them. Documented pricing rules and delegated authority make earnings more transferable.
Engineer depth. One person being the only engineer competent on a client’s plant is a single point of failure.
Company-held accreditations. In a technical trade, certifications held by the company and supported by more than one qualified individual are materially more transferable than those dependent on one person.
Which accreditations apply, and who has to hold them, varies by sector — the certification baseline for HVAC, heat pump, solar, EV charging and retrofit work is worth auditing before a buyer does it for you.
Job-level costing. A blended gross margin can conceal whether service is subsidising installation. Buyers are cautious about what they cannot see.
Monthly management accounts. Consistent monthly reporting is evidence that the business is being managed through numbers rather than reconstructed after the year end.
None of these improvements require a sale to be useful. That is the important overlap: the things that make an HVAC business easier to run can also make its earnings easier for a buyer to trust.
Worked example: what might a £4m HVAC business be worth?
The figures below are modelled from published UK benchmark ranges. They are illustrative, not a real transaction and not a prediction for your business. They show how revenue mix, profitability and the benchmark category can interact.
| Version A — install-led | Version B — service-led | |
| Revenue | £4.0m | £4.0m |
| Maintenance and service | 25% | 55% |
| Adjusted EBITDA | £400k (10%) | £520k (13%) |
| Benchmark category | Construction and engineering | Technical building services |
| Illustrative multiple | 3.5x | 5.0x |
| Enterprise value | £1.40m | £2.60m |
Same turnover. A difference of £1.2m in enterprise value. Part of that difference comes from higher earnings; part comes from the illustrative category shift and multiple.
The margin improvement in Version B is also important. Service and maintenance work can have different economics from project installation, and a business that has built a larger contracted book will often have improved the pricing and operating discipline needed to support it.
From enterprise value to cash at completion
Enterprise value is not the same as the amount that arrives in your bank account. Several adjustments can sit between the headline valuation and cash at completion.
Understanding the full process of selling a business in the UK, from heads of terms to completion, helps explain where that difference comes from.
Debt-free, cash-free. Borrowings and relevant finance leases are settled against the price, while surplus cash may be added back. How lenders and buyers read the same balance sheet is a related question.
Working capital peg. The buyer expects a normal level of working capital to come with the business. Deliver less than the agreed level and the price can reduce pound for pound.
Deferred consideration and earn-outs. Part of the price may be paid later and conditioned on performance. Much of this is shaped at the letter of intent stage.
Escrow and indemnity. Part of the consideration can be held back against warranty or indemnity claims, though warranty and indemnity insurance can reduce what is held.
Revenue recognition. On long installation contracts, the way revenue and work in progress have been recognised can have direct consequences for the transaction.
Using Version B:
| Enterprise value | £2.60m |
| Less fleet finance and borrowings | (£250k) |
| Plus surplus cash | £100k |
| Less working-capital shortfall | (£80k) |
| Equity value | £2.37m |
| Less earn-out (one fifth) | (£474k) |
| Less escrow (one tenth) | (£237k) |
| Cash at completion | £1.66m |
That illustrates an important distinction: a £2.6m enterprise value does not mean £2.6m of cash on completion.
Working capital, retentions and WIP in installation businesses
Installation businesses are structurally different from many of the businesses most valuation content is written about, and the difference concentrates in working capital.
Materials are paid for early. Retentions are released late, often months after practical completion. Applications for payment are not the same as certified value. Work in progress on part-complete installations has to be measured rather than guessed. Van stock across a fleet can be an asset on paper and a write-off in practice.
All of this gets negotiated into the working-capital peg. An owner who has never measured it is negotiating against a buyer who does this for a living. The underlying discipline is the quote-to-cash cycle: every week of slack ties up cash and can become part of the transaction debate. Protecting cash flow and working capital is a planning exercise rather than a reaction.
How to increase the value of your HVAC business
You do not need to be preparing for a sale to act on any of this.
- Build contracted maintenance revenue
- Improve pricing discipline
- Reduce customer concentration
- Document how the business operates
- Develop depth across engineers and management
- Make accreditations transferable
- Know job-level margins
- Produce reliable monthly management accounts
- Reduce the decisions that only the owner can make
These changes do two things at once: they improve the business today and make its earnings more transferable tomorrow.
The owners who do best when a buyer arrives usually spent the preceding two or three years building something that survives inspection. The owners who do badly started preparing when the letter arrived.
The practical lesson is straightforward: the value of an HVAC business is not determined by turnover alone. It is shaped by sustainable earnings, recurring revenue, owner independence, customer quality, operational depth and the risks a buyer believes it is taking on.
The earlier these factors are understood, the more useful the valuation becomes. A business owner does not need to be preparing for a sale to benefit from knowing which characteristics buyers reward and which ones create a discount.
If you want to understand where your business currently sits, that is what our business valuation work is for, and what a fractional COO engagement is designed to change.
Frequently asked questions
How many times profit is a UK HVAC business worth?
UK mid-market data puts construction and engineering businesses towards the lower end of sector tables, typically in low single-digit adjusted EBITDA multiples, while technical building services and facilities management can sit meaningfully higher. American figures should not be treated as a direct UK benchmark.
Do maintenance contracts increase the value of an HVAC business?
They can increase value in two ways: by adding recurring earnings and, where the contracted revenue is substantial and well managed, by changing how a buyer benchmarks the business.
What is EBITDA normalisation?
It is the process of restating statutory profit to show sustainable earnings under a new owner, with appropriate adjustments for non-recurring or owner-specific items.
How much of the sale price is paid at completion?
Not necessarily all of it. Debt, cash, the working-capital peg, deferred consideration and escrow can all affect the cash received on day one.
Does my business need to be fully accredited before a sale?
Accreditations matter, but so does transferability. Certifications registered to the company and supported by more than one qualified individual are less dependent on the owner than certifications that rest on one person.
