How much does AI automation cost in the UK? Twelve agencies, one ladder.

Ask an automation agency what it costs and the honest ones will ask what you want automated. That is not evasion. A single workflow that moves data from a form into a CRM is a different product from an agent that reads every application, scores it and books an interview, which is different again from a system that connects five departments. The market has quietly settled on a four-rung ladder for these, and once you know the rungs, every quote you receive can be placed on it.

We read every UK agency that publishes prices, plus the agencies Google’s own AI answers name for "who can build an AI agent for my business", and recorded what each charges at each rung. Then we did the part the agencies skip: what the thing costs to run every month afterwards, which in our own production systems has turned out to matter more than the build.

Prices as published in 2026, excluding VAT. Where a figure came from Google AI Mode’s answer rather than the agency’s own page, the source says so; those were captured on 11 September 2026.

All figures exclude VAT. TopTenAIAgents’ February 2026 survey of ten further agencies puts entry prices between £87 a week and £10,000, hourly rates at £80 to £200, and retainers at £600 to £1,950 a month, which sits inside the ranges above.

Reconciled, the market looks like this. The spread column is there because an agency that quotes at the top of a band is not necessarily overcharging; it may be building more.

The question Google shows most often under this search is "how much does one AI agent cost", so here is the direct answer. To build: £800 to £5,000 if the agent does one thing and talks to one system; £4,000 to £15,000 if it has to read messy inputs and update several systems with a person approving the risky steps. The price is set by the integrations and the mess, not by the AI.

To run: pennies per task for the model. AI Agency Plus puts realistic model usage for a small business at £5 to £100 a month, and that matches what we see. The expensive part is whatever the agent does after it decides. A text message costs 4 to 5p. A minute of AI voice costs 15 to 20p. An agent that sends a thousand messages a month spends more on messages than on thinking. In our own recruitment platform, language model calls have been a single-digit share of variable AI spend, and messaging the largest line.

Most automation runs on one of three platforms or on code an agency writes. The platforms bill per operation, and the same workflow can cost eight times more on one than another once it is busy. These are the published prices in 2026, in the currency each vendor bills in; UK buyers add 20 per cent VAT.

Platform prices from the vendors’ own pages and 2026 pricing guides; per-message and per-minute figures from AI Agency Plus, consistent with UK carrier and voice-platform pricing.

Here is why the running cost has to be modelled before the build is priced. Our platform makes outbound AI screening calls to job applicants. Over a ten-week production window, about half of those calls reached voicemail, a quarter never connected, and roughly one in eight reached a person. When a person answered, the conversation ran a little over three minutes and nineteen in twenty produced a usable, scored assessment.

Now price it at the published rates. Suppose an agency builds you an agent that dials a thousand applicants a month. If every call cost a full minute of voice time, that is £150 to £200 in voice alone, most of it spent on calls nobody answered. The one hundred and twenty-five people who did answer cost £60 to £75 in call time and produced the outcomes. The other eight hundred and seventy-five cost more than that and produced nothing, unless the agent sends a text in the same minute with a link to finish by chat, which costs 4 to 5p each and recovers a good share of them.

That is the difference between an automation that pays back and one that quietly burns a budget. A quote that gives you a build price and no running-cost model has not done this sum. Ask for it.

Illustrations built from the consensus figures, not client accounts.

Low-code platforms are the right answer for a lot of automation: connecting two well-supported apps, moving data on a trigger, a workflow your own team should be able to edit. They are the wrong answer when the logic is complex, the volume is high, the inputs are messy or a failure is expensive. The cost crossover is easy to spot from the table above. Once a workflow is running tens of thousands of operations a month, a per-operation platform can cost £3,000 to £5,000 a year in fees for something a built system runs for the price of a small server. Below that volume, the platform is cheaper and faster to change.

The agency should tell you which it is using and why, and you should own it either way, including the accounts. A retainer that exists mainly because the agency holds the login is not support; it is rent.

The Office for National Statistics found in June 2026 that about 35 per cent of UK businesses with ten or more employees use AI in some form, but that only one adopter in ten uses it extensively; most are using a tool, not running a system. The commonest barrier is expertise, not money. The money question is easier than people think, because the hours are already known.

Sage puts UK small business owners at fifteen hours a week on admin. HeyBRB’s March 2026 survey puts repetitive admin at eight hours a week, or ten working weeks a year, and found that 83 per cent of owners had never calculated what that costs. At £30 an hour, eight hours a week is £12,480 a year for one person. A £3,000 automation that removes half of it pays for itself in about six months, before counting the work that gets done instead. That is the calculation an audit should hand you, with your numbers in it.

Any agent that calls or messages people is regulated. It needs consent or another lawful basis, an opt-out honoured on every channel, a clear statement that the person is dealing with an AI, and a do-not-contact list it never breaches. Building that in costs days at the start; retrofitting it after the first complaint costs a great deal more. If you trade with EU customers the EU AI Act adds transparency duties for AI that interacts with people. Ask any agency how these are handled before you ask what it costs, because the answer changes the price.

Since we are a row in the table: an automation audit at £2,500 to £6,000, credited in full against the build; a single agent or workflow at £4,000 to £15,000; a multi-agent system at £8,000 to £25,000; all fixed against a written scope. Running costs are stated before go-live and capped in production, because we run the same agents in our own products and pay the same per-message and per-minute prices you will.

We searched Google UK for the question and its variants on 11 and 12 September 2026, read every page-one result and every UK agency pricing page they linked to, and recorded each published figure with its date. We added the agencies and prices that Google’s AI Mode named in its own answers on 11 September, marked as such. Platform prices are from the vendors and from 2026 pricing guides; per-message and per-minute figures are from AI Agency Plus and match UK carrier and voice-platform pricing. The call-outcome shares are from our own production platform over a ten-week window and are published in full in the linked guide. Adoption and admin figures are from the ONS, Sage and HeyBRB. All prices exclude VAT. The date at the top of this page is the date of the last check.