A small accounting firm didn't plan to specialise in electrical contractors. It happened gradually — one electrician became a client, then another came through as a referral, then another. Over a few years, the firm quietly built up a cluster of electrical contractor clients, not through strategy, but simply by doing good work and letting word travel through a tight-knit trade network.
What the firm didn't realise, for a long time, was what that pattern was actually doing to their margins.
Repetition builds efficiency, even when nobody's tracking it
Every time the firm worked with another electrical contractor, they got a little faster. They understood the industry's cash flow patterns — the seasonal gaps, the equipment financing, the way jobs get invoiced. They recognised common deductions and recurring issues almost immediately, because they'd seen the same shape of problem a dozen times before.
Work that once took seven hours started taking four. Same quality. Less effort. The firm had accidentally become highly efficient at serving a specific type of client — but they had no clear way to see it, because nobody was comparing profitability by client type. Revenue looked the same as any other client. Nothing on the invoice suggested anything had changed.
The moment it became visible
It wasn't until someone looked closely at profitability by client type — actual margin, not just revenue — that the pattern became obvious. Electrical contractors were generating significantly stronger margins than much of the rest of the client base. Not because they paid more. Because the firm had quietly become very good at serving them, and that efficiency showed up directly in the bottom line once effort was properly accounted for.
What changed once the firm could see it
That single insight changed how the firm thought about growth. They became more intentional about attracting similar clients instead of taking whatever work came through the door. Their messaging became more specific — speaking directly to trade businesses instead of "small business owners" in general. Referral conversations became easier, because tradespeople tend to know other tradespeople, and momentum built naturally once the firm leaned into it deliberately.
What started as an accident eventually became one of the firm's strongest, most defensible growth opportunities — not because they discovered a new market, but because they finally recognised the one they'd already built.
Why this is more common than most firms realise
Niches usually don't arrive as a deliberate strategic choice. They accumulate — through referrals, through geography, through whichever client type happened to say yes first. The firm doing the accumulating is often the last to notice, because from the inside, all client work tends to blur together as "busy."
The only way to spot an accidental specialism is to compare profitability across client types directly, side by side, with effort properly accounted for. Revenue alone won't reveal it — a niche client base can look completely ordinary on the top line while quietly outperforming everything else on margin.
The question worth sitting with
How many small accounting practices — owner-led, under 20 staff — have already become highly efficient at serving a particular type of client without ever clearly recognising it? And more importantly: would they know how to see it if it were sitting right in front of them?