A buyer does not value an HVAC business on its turnover. It values the earnings it expects to keep once the owner steps back, and applies a multiple drawn from comparable deals in the market it is buying in. Both halves of that sum need care: the earnings figure is restated before anyone multiplies it, and the multiple depends on which market, and which type of business, the buyer compares yours with.
Multiples quoted for US HVAC businesses describe a different market, with different transaction data, financing conditions and sector benchmarks. A UK buyer is working from UK evidence.
The short answer: UK HVAC and installation businesses large enough to attract trade or private equity buyers are valued on a multiple of adjusted EBITDA rather than turnover. UK mid-market survey data puts construction and engineering towards the bottom of its sector tables, while a business with a substantial contracted maintenance book can be read more like a technical services or facilities management business, where buyers place weight on long-term recurring revenue.
This article explains how that number is put together in general terms. It is not tax, legal or financial advice. It is a companion to the piece on what actually makes an HVAC business sellable, which deals with readiness rather than valuation.
Why US HVAC valuation multiples can mislead UK owners
Kroll’s analysis of the US residential HVAC services market reports founder-owned 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 asks UK and Ireland M&A advisers twice a year for their estimates of average EBITDA multiples for businesses with £1m to £200m of revenue, and its all-sector average has sat between about 5.1 and 5.4 times in recent editions. Dealsuite does not publish an HVAC category. Project-led installers are most likely to be compared with its construction and engineering sector, which has repeatedly come in at or near the bottom of the table. In the February 2026 edition, covering the second half of 2025, it averaged 3.9 times against a 5.4 all-sector average, eleventh of thirteen sectors. In the February 2023 edition it was bottom, at 3.3 times against 5.1.
Reading American data is not the problem. Treating it as a UK benchmark is. Expectations built on US multiples can make a normal domestic offer look like an insult when the underlying market is simply different.
The same principle applies across Europe. In the February 2026 edition, UK and Ireland construction and engineering averaged 3.9 times against 4.9 times in the DACH region (Germany, Austria and Switzerland). The gap varies by sector, but where the buyer is based can affect the valuation as well as what has been built.
What type of HVAC business is a buyer actually valuing?
This matters more than any single multiple. Before an adviser or acquirer selects a comparable multiple, they decide what kind of business they are looking at. The table below is a guide to how each type of business tends to be read, not a set of published sector definitions.
| Category | What it describes | How it is typically read |
| Construction and engineering | Project-led work, won job by job, delivered and invoiced | Repeatedly among the lowest-rated sectors in UK mid-market survey tables |
| Business services | Ongoing commercial relationships with some contracted element | Rated above construction and engineering in Dealsuite’s surveys: 6.0 against 3.9 times in the February 2026 edition |
| Facilities management and technical services | Contracted, compliance-led and recurring | An area where investors look for long-term recurring revenue, with private equity building platforms through acquisition |
BDO’s 2026 facilities management report describes private equity acquiring platforms to consolidate technical services and compliance-led markets, with building maintenance and M&E making up half of all facilities management deals in 2025.
A business is not permanently assigned to one of these categories. Its revenue mix helps determine which benchmark a buyer reads it against.
A business that is mostly project installation is likely to be benchmarked against the 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 a technical services business. That is not just a marginal change in the multiple. It can be a change of category.
This is why contracted maintenance revenue matters to valuation and not only to the service department. Recurring revenue changes the earnings profile and can change how the whole business is perceived by a buyer.
What UK data do buyers and advisers use to benchmark value?
Three publicly referenced sources are a useful starting point:
- Private company multiples through the ICAEW library, which gives access to data on the multiples paid for UK private businesses.
- Dealsuite’s UK&I M&A Monitor, which surveys UK and Ireland advisory firms twice a year.
- MarktoMarket’s UK Valuation Indices, built from private-company transaction data and presented by deal size and sector; the published commentary uses 2019 data.
The ICAEW’s valuation resources list these and other sources of UK price multiples. Each is a reference point rather than a valuation, and each is built in a different way, from different samples, over different periods.
Published multiples are best read as a spread, not a target. A single decimal place does not make a valuation precise.
What is adjusted (normalised) EBITDA — and why isn’t it the profit in the 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 the statutory accounts. Those accounts are prepared for financial reporting and tax purposes and may contain owner remuneration, personal expenditure, unusual professional fees and other items that a buyer looks at differently.
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. The reconciliation between reported profit and the adjusted figure is usually set out line by line, so each adjustment can be tested.
Normalisation is not a licence to make the profit look better. It is an attempt to establish sustainable, transferable earnings.
What EBITDA add-backs survive due diligence?
A seller’s list of costs that are ‘not really business costs’ is tested line by line in diligence. Some items survive and some do not. Each accepted add-back is multiplied by the valuation multiple, so how an item is classified matters.
The principle is simple: an add-back is a claim that a cost disappears when the owner does. If it will still be there after completion, it is not an add-back.
| Usually survive | Usually do not |
| Owner pay restated to the market salary for the role a successor would perform (this can raise or lower EBITDA, depending on whether the owner is paid above or below that rate) | ‘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 treat recurring requirements as normal costs.
Check your business: Earnings and benchmark
- Does contracted maintenance make up a meaningful share of last year’s revenue?
- Could each adjustment between reported profit and adjusted EBITDA be evidenced line by line?
- Are owner-specific costs run through the company identified and recorded separately?
How company size affects the valuation multiple
Size can affect the multiple independently of quality, and the pattern appears in UK survey data. Dealsuite’s adviser survey compares multiples for UK SMEs with adjusted EBITDA between £200,000 and £10m, and reports lower multiples at the smaller end. MarktoMarket’s published index commentary (2019 data) noted the same link between deal size and multiple, which is part of the economics behind buy-and-build strategies.
This matters to a seller because a consolidator may be buying an asset it can integrate into a larger platform. The buyer is not only comparing EBITDA with a published multiple; it is considering what the business adds to its existing platform.
That can influence negotiation, but it does not mean the seller receives the buyer’s platform multiple. The quality and transferability of what is being handed 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 a business lands.
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. Pricing rules and decision rights captured in documented operating procedures 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 more transferable than those that depend 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 sets out what applies to each.
Job-level costing. A blended gross margin can conceal whether service is subsidising installation. Buyers are cautious about what they cannot see. Where margin leaks in an installation business, and which fixes a buyer will accept, is covered in how to improve profitability before selling an HVAC company.
Monthly management accounts. Consistent monthly reporting is evidence that the business is managed through its numbers rather than reconstructed after the year end.
Why is the headline value not the cash received at completion?
Enterprise value is not the same as the amount that arrives in the seller’s bank account. Several adjustments can sit between the headline valuation and cash at completion. The steps to sell your HVAC business, from heads of terms to completion, show where each one is agreed. What a buyer asks for at each of those stages is set out in what to do before approaching buyers.
Debt-free, cash-free. Borrowings and relevant finance leases, including vehicle finance, are settled against the price, while surplus cash may be added back.
Working capital peg. The buyer expects a normal level of working capital to come with the business. If less than the agreed level is delivered, the price can reduce pound for pound.
Deferred consideration and earn-outs. Part of the price may be paid later and depend on performance after the sale. The structure is set out at heads of terms.
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.
Why does working capital matter more in installation businesses?
Installation businesses are structurally different from many of the businesses valuation guidance 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 feeds into the working-capital peg, which a buyer’s team will measure carefully. The underlying discipline is the quote-to-cash cycle: every week of slack in it ties up cash and can become part of the transaction discussion.
Check your business: Cash and completion
- Is the normal level of working capital through the year known, month by month?
- Are retentions, applications for payment and work in progress tracked job by job?
- Are service and installation margins reported separately in the monthly management accounts?
What do buyers reward in an HVAC business?
Taken together, the factors above describe what a buyer is prepared to pay more for, and what creates a discount:
- Contracted, well-priced maintenance revenue
- Pricing that holds when someone other than the owner quotes
- A spread of customers rather than a few large ones
- Documented ways of working
- Depth across engineers and management
- Accreditations held by the company, not one person
- Visible margins at job level
- Reliable monthly management accounts
- Few decisions that only the owner can make
None of these depends on a sale to be useful. The things that make an HVAC business easier to run are largely the same things that increase business valuation, because they make its earnings easier for a buyer to trust. The same is true of the company’s name and reputation: a buyer pays for them only if they stay with the business, as explained in how a brand is valued when a business is sold.
The value of an HVAC business is not set 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.
Frequently asked questions
They decide which category the business belongs to, then adjust for size and for how transferable the earnings are. UK mid-market survey data puts construction and engineering in low single-digit adjusted EBITDA multiples, towards the bottom of its sector tables. American figures describe a different market and are not a direct UK benchmark.
In two ways: they add recurring earnings and, where the contracted revenue is substantial and well managed, they can change the category a buyer benchmarks the business against.
It is the process of restating statutory profit to show sustainable earnings under a new owner, with adjustments for non-recurring or owner-specific items.
Debt, surplus cash, the working-capital peg, deferred consideration and escrow can all sit between the headline value and the cash received on the day.
Whether the right accreditations are in place, and whether they are transferable. Certifications registered to the company and supported by more than one qualified individual depend less on the owner than certifications that rest on one person.
Sources
- Kroll: M&A in the Residential HVAC Services Industry and What’s Driving Growth
- Dealsuite: UK&I M&A Monitor February 2026 (PDF)
- Dealsuite: UK&I M&A Monitor August 2025
- Dealsuite: UK&I M&A Monitor February 2023 (PDF)
- BDO: Facilities management: value, transformation and opportunity in M&A
- ICAEW: Private company multiples
- ICAEW: Price indexes
- MarktoMarket: UK Valuation Indices
Figures last checked: October 2026.
