How Much Does AI Automation Cost for a Mid-Sized UK Business?
AI automation for a mid-sized UK business typically costs £8,000–£20,000 for discovery and strategy, £15,000–£60,000 to build and deploy a first process, and £100–£1,000 a month to run — with well-chosen processes paying back inside 6–12 months. Here is the full breakdown, from real deployments.
The short answer
For a UK business of 50–500 people in 2026, expect: £8,000–£20,000 for a discovery-and-strategy phase that produces an ROI-ranked roadmap, £15,000–£60,000 to design, build and deploy a first automation into production, and £100–£1,000 a month in running costs. A well-chosen process — high volume, expensive errors, measurable hours — pays that back in six to twelve months. Everything below unpacks where those numbers come from and what moves them.
Why the quotes you’ve collected disagree so wildly
Ask three vendors about “AI automation” and you’ll get quotes from £5,000 to £500,000, because the phrase covers three different purchases. Off-the-shelf tools (£50–£500/month) solve narrow, generic tasks — transcription, basic chatbots — with no integration into your systems. Configured platforms (£10,000–£40,000) wire existing automation products into your stack; most mid-market wins live here. Custom systems (£30,000–£150,000+) are built when the value depends on your data and rules — the contract-review system we built for a London law firm is a £180K-a-year-saving example. The first cost question is which category your problem is actually in, and an honest discovery phase answers exactly that.
The cost anatomy of a real project
Using our own engagement structure as the reference — it mirrors the market’s sane end:
Discovery and strategy (£8,000–£20,000). Two to three weeks mapping processes, quantifying the leak, and ranking opportunities by payback. This phase kills bad projects cheaply, which is its real value: roughly a third of the ideas clients bring us don’t survive the maths, and finding that out for £10K beats finding out for £80K.
Build and deploy (£15,000–£60,000 per process). What moves the number: how many systems we integrate with (each ERP, CRM or practice-management connection adds work), document complexity (reading a structured form is cheap; reading forty stockists’ habits is not), review-interface needs, and compliance requirements. Our retail order automation sat mid-range; heavily regulated builds like financial reporting sit higher.
Running costs (£100–£1,000/month typical). Model usage at mid-market volumes is cheaper than most buyers expect — a document pipeline processing 5,000 documents a month often runs under £300. Hosting adds £50–£300. Support retainers are optional if you take the system in-house, which our handover model is designed to allow.
The payback maths, honestly
The template: one full-time employee’s fully loaded cost in a mid-sized UK firm is £35,000–£55,000 a year. An automation that saves 85% of a process consuming two FTEs of effort — our average across deployments — returns £60,000–£90,000 annually against a one-off build in the £15K–£60K range. Add error costs (re-shipments, missed bookings, compliance near-misses) and the case usually strengthens: the retail brand above counted £120K a year, the clinic group recovered a six-figure sum in missed-call bookings alone.
Two honest caveats. First, the maths only works if the hours saved are redeployed or removed — savings that evaporate into slack are real to staff morale but invisible to the P&L. Second, the first project carries setup costs (data access, security review, team learning) that the second and third don’t; automation programmes get cheaper per process as they compound.
Where budgets get wasted
Three patterns account for most wasted AI spend we’re asked to rescue: building a chatbot nobody asked for while invoices are still keyed by hand; paying enterprise-platform licence fees for mid-market volume; and proofs-of-concept that were never scoped to reach production — a demo is not a deliverable. The antidote to all three is boring: rank by ROI, fix success metrics in writing, and refuse to start builds that don’t have a production path. That discipline is most of what you’re buying from a good consultancy.
What to do next
If you want the number for your specific process, the fastest route is a free 30-minute strategy call — bring volumes (documents, orders, calls per month) and current head count on the process, and we’ll do the payback maths live. To calibrate further first, read which processes are worth automating first or browse the case studies these figures come from.
Quick answers
What does AI automation cost per month after launch?
For most mid-market deployments: £100–£1,000 in model and API usage, modest hosting (often £50–£300), and an optional support retainer. Total running cost is typically 5–15% of the build cost per year — a fraction of the salary cost the automation displaces.
Is there a cheaper way to start than a full project?
Yes: a discovery-and-strategy engagement (£8,000–£20,000) buys you an ROI-ranked roadmap you can execute with anyone, and a free 30-minute strategy call costs nothing and will kill or confirm your project idea on the spot. Off-the-shelf tools at £50–£500 a month are also the right answer for some narrow tasks — a good consultancy tells you when.