[hn_throwaway_99]

I am not in the business of valuing small businesses, but one thing that seems off to me is that an EBITDA multiple is usually also dependent on the overall size of the business. That is, a business with only $1 million in EBITDA may only be worth 3-4x that, while a business with $10 million in EBITDA might be worth 8-10x EBITDA, on the theory that larger businesses will be more stable and less likely to have key person or large customer risk (some examples, https://raincatcher.com/ebitda-valuation-multiples-by-indust...)

That said, I agree with your overall assessment that $10 million single-owner plumbing businesses are rare, for the simple reason that $10 million single owner anything is rare. If it were not rare, by definition you'd have a lot more folks worth $10 million (and, in this case, a lot more people lining up to be plumbers), and then $10 million would probably not be worth very much.

[sarchertech]

I’m not a plumber but from spending 20 minutes looking into it, it looks like the primary thing that changes the value multiple is how involved the owner is in the business (your key person risk). 5x was also on the high side of the multiples I saw.

The thing to keep in mind though is we’re talking small business, once you get to $10 million EBITA, you’re probably talking $50-$200 million in revenue and 200-500 employees. Thats firmly into mid sized business territory and I think revenue growth would be the or primary driver of the multiple.

From your source a 10x multiple would require very high revenue growth. That makes sense because you can get 10% average return with index funds, so you need to significantly beat that ROI.