Most founders start too late. Here is the sequence that consistently produces a cleaner process, a better price and fewer late-stage surprises.
Almost every founder we meet who has already sold a business says the same thing: they wish they'd started preparing eighteen months earlier. The founders still holding their companies almost always disagree — right up until they meet a buyer.
This is a practical roadmap. Not a valuation formula, not a checklist you can print and tick off, but the sequence of work that consistently produces cleaner processes, better prices and fewer late-stage renegotiations. It assumes you own a UK SME, you're thinking about a sale in the next one to three years, and you'd rather not learn the expensive lessons in real time.
Months 18–15: the honest audit
Before anything is fixed, everything is seen. The first three months are diagnostic. You (or a trusted outside advisor) sit down with the numbers, the customers, the contracts, the systems, the org chart and the founder's actual diary — and you write down, in one document, what a serious buyer's due-diligence team is going to find.
Every business has skeletons. The point of the audit isn't to hide them — it's to surface them early enough that most can be quietly resolved before anyone else looks. The rest can be disclosed cleanly and priced honestly, rather than discovered in week six of DD and used against you.
What to look at, honestly
- Customer concentration — anything over 15% from a single customer is a red flag to most buyers.
- Contract quality — are recurring revenues actually contracted, or just habitual?
- Key-person risk — how many decisions still route through the founder's inbox?
- Financial hygiene — management accounts within a fortnight of month-end, clean reconciliations, defensible EBITDA add-backs.
- Legal housekeeping — cap table, IP ownership, employment contracts, historical share transactions.
Months 15–9: value engineering
Now the deliberate work begins. This is the six-month window where you actually move the numbers a buyer will pay a premium for. Do not try to boil the ocean — pick three drivers and do them properly.
For most SMEs the leverage sits in a small number of places: shifting revenue mix toward recurring or contracted lines, reducing customer concentration by adding evenly-sized clients, lifting gross margin through pricing and mix, and — quietly the most important — engineering yourself out of the day-to-day. See our related piece on making yourself redundant for the mechanics.
You cannot fake value in month twelve. But you can absolutely build it in month fifteen — and be paid for it in month eighteen.
Months 9–4: the data room and the story
By month nine, the shape of a sellable business should exist. Now you package it. Assemble the data room properly — organised the way a buyer's advisors expect, with every material contract, financial file, legal document, HR record and IP register in place. Fill the gaps. Answer the questions the audit flagged.
In parallel, work with your accountants to lock down a defensible normalised EBITDA and clean add-back schedule. This single document, more than any other, will shape the headline number of every offer you receive. If you'd like a deeper dive on how buyers actually build the number, read our valuation piece.
The management story
At the same time, prepare the story: how the business was built, why it grew, what drives its unit economics, what a good buyer can do with it that you can't. Buyers do not pay premium multiples for spreadsheets — they pay them for a coherent narrative they can take to their own investment committee.
Months 4–0: process and completion
The final stretch is largely mechanical if the first fifteen months are done well. Advisor selection matters — the right corporate finance firm for a £5m business is not the same as for a £50m one. Get references from founders who have completed, not those who are mid-process.
Expect the process itself to swallow four to six months. Management meetings, LOIs, due diligence, SPA drafting, disclosure, completion. The single most important variable in this window is founder stamina — which is why the earlier work matters: it lets you stay strategic when you're most tired.
What to do if you don't have eighteen months
You compress. Twelve months is workable — you'll get through most of the audit and the top-priority value drivers. Six months is triage: focus almost entirely on the data room, EBITDA hygiene and reducing the most obvious risks (customer concentration, key-person, contract quality). Any less than that and you're negotiating with whatever the business currently is.
A parting note
A well-prepared sale is not just about a bigger number. It's about arriving at completion clear-headed, without a five-year earn-out that traps you inside your own former company, and with the confidence that you sold on your terms. Eighteen months of deliberate work is a small price for that.
If you'd like to think this through together, our Exit & Succession practice exists for exactly this window.
Written by the Danicwin Team.
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