You Built a Structural Engineering Practice. Right Now, It's Unsellable.

You've been running this firm for 10 years. Maybe 15. You've got loyal clients. Architects who come back. A decent reputation locally. Revenue somewhere between £100,000 and £500,000.

And if you tried to sell it tomorrow, nobody would buy it.

Not because the work is bad. The work is probably excellent. But because the "business" is just you. You're the client relationships. You're the project tracker (an Excel file on your desktop). You're the compliance records (emails you'd need three days to find). You're the quality control, the invoicing, and the institutional memory.

A buyer doesn't want to buy you. They want to buy a business that works without you. And right now, you don't have one.

The maths are brutal at this size.

Engineering firms typically sell at SDE multiples between 2.48x and 3.04x. SDE (seller's discretionary earnings) is basically your profit plus your salary plus any personal expenses running through the business.

For a firm doing £300,000 in revenue with an SDE of £80,000, that's a valuation of roughly £200,000 to £240,000. For a decade or more of your working life.

But here's the thing. Those multiples are averages. UK engineering firms with strong documentation and transferable systems can achieve EBITDA multiples of 3.3x to 5.0x, according to GS Verde Group's 2025 M&A analysis. The firms at the bottom of that range have heavy founder dependence. The firms at the top have systems.

On an SDE of £80,000, the difference between 2.5x and 3.5x is £80,000. That's a year's worth of earnings you're either capturing or leaving behind, based entirely on how your firm operates. Not how well you engineer.

For a larger practice doing £500,000 with an SDE of £150,000, the gap between 2.5x and 3.5x is £150,000.

The numbers aren't huge in isolation. But they represent the difference between walking away with something meaningful and walking away wondering why you bothered.

Why small firms get hammered on valuation.

The Dealsuite UK M&A Monitor calls it the "Small Firm Premium." Except it's not a premium, it's a discount. Smaller businesses get lower multiples because they carry more risk.

What kind of risk? The exact kind that describes most 2-5 person structural engineering practices:

The founder IS the business. Every client relationship runs through one person. If that person gets ill, goes on holiday, or retires, the revenue stops. A buyer sees that and thinks: "I'm not buying a business. I'm buying a salary that disappears when this person leaves."

Nothing is documented. The process for onboarding a new client is "whatever feels right at the time." The fee proposal process is "open last year's quote and change the numbers." Compliance documentation is scattered across email, folders, and memory. A buyer can't transfer what isn't written down.

There's no second layer. Nobody else can run a project from start to finish. Nobody else knows which clients pay on time, which building control officers are difficult, or where the structural calculations from the 2021 job are stored.

Every one of these problems compresses your multiple. And at £100k-£500k revenue, you can't afford to leave anything on the table.

"I'm not planning to sell." Then this matters even more.

Most owners of small structural practices aren't thinking about exit. Fine. But everything that makes a firm unsellable also makes it unscalable and exhausting to run.

If you can't take two weeks off without everything falling apart, that's not a business. That's a trap with a nice job title.

If every new project means seven emails to collect basic information because you don't have a standard onboarding process, that's hours you can't bill.

If you're spending your Tuesday afternoons chasing invoices instead of doing the engineering work you actually trained for, that's money draining out of a firm that can't afford to lose it.

At £100k-£500k revenue, margins are tight. You probably don't have a dedicated admin person. You definitely don't have an office manager or a finance team. You are the admin person. You are the finance team. You are everything.

Which means every hour you lose to broken systems comes directly out of either your earnings or your evenings. Probably both.

The Building Safety Act made documentation non-negotiable.

This used to be optional. "We keep good records" meant "I can probably find it if I look hard enough."

Not anymore.

The Building Safety Act introduced compliance gateways, tightened dutyholder responsibilities under CDM, and created the Building Safety Regulator. For structural engineering firms, this means documented proof of principal designer duties, structural assessments, building control approvals, and fire safety compliance. Per project. Retrievable on demand.

If a regulator investigates a project from 2022 and your records are buried in email threads and the memory of a subcontractor you haven't spoken to in two years, you've got a problem. Not a theoretical problem. A fine-and-reputational-damage problem.

At £100k-£500k revenue, a £10,000 fine isn't an inconvenience. It's catastrophic.

The firms that survive regulatory scrutiny aren't better engineers. They're the ones who can pull up documentation in minutes because it's organised by project in one system, not scattered across seven.

What actually needs to change.

I'm not going to pretend you need enterprise software. You don't. You're running a small practice, not Arup. But you do need a few specific things that most firms at your size don't have.

One place for everything per project. Emails, files, calculations, site photos, approvals, client communication. All in one project record. Not across Outlook, a shared drive, WhatsApp, and someone's notebook. When a client calls about a project from last year, you find the answer in 30 seconds, not 30 minutes.

A repeatable client onboarding process. A structured form that captures site address, building regs, existing drawings, timeline, contractor details. You send one link. The client fills it in. Done. No more seven-email chains over two weeks to collect information you need on day one.

Payment chasing that doesn't rely on your memory. Automatic reminders at day 7, 14, 21. Payment confirmations. Reconciliation with Xero or QuickBooks. At your revenue level, a single late invoice can throw off your entire month's cash flow. You can't afford to chase manually and forget.

Compliance records that exist automatically. Building reg approvals linked to projects as they happen. CDM documentation captured during onboarding. Not reconstructed months later when someone asks for it.

The ability to step away. Even for a week. Even for a long weekend. Without everything stopping.

None of this requires a six-figure software implementation. It requires a system that was built for how small engineering firms actually work , not a generic CRM adapted from a marketing agency tool.

The real cost of doing nothing.

Let's be conservative. Say you're a solo practitioner or a 3-person firm doing £250,000 a year. You personally lose 8 hours a week to admin that a proper system could handle. Chasing invoices. Searching for files. Copying data between tools. Onboarding clients via email chains.

8 hours × 48 weeks = 384 hours a year.

At a charge-out rate of £75/hour, that's £28,800 in billing you can't recover. In a firm doing £250,000 in revenue, that's 11.5% of your total revenue , gone to admin friction.

Or look at it another way. Those 384 hours are 48 full working days. Nearly 10 working weeks. Two and a half months of your year spent on work that isn't engineering.

You're not going to hire an admin person at £25,000 a year when your revenue is £250,000. The maths don't work. But you can use a system that eliminates most of that admin for a fraction of the cost.

Stop building a job. Start building something transferable.

Maybe you'll sell the firm one day. Maybe you won't. Maybe you'll hand it to a partner, or wind it down, or keep running it until you decide to stop.

Regardless, a firm with documented workflows, organised compliance records, and systems that don't depend on your memory is worth more than one without. Not just to a buyer. To you. Right now. Every day you run it.

Because the same things that make a firm sellable , repeatable processes, accessible information, automated admin , are the same things that make it less exhausting to operate.

You didn't spend years getting chartered to chase invoices on Tuesday afternoons.

The practice you built deserves better systems than Excel and hope.

So do you.