How much does AI development cost in the UK? For a small or medium business, typical projects run from about £1,000 for a light automation to £50,000 or more for a custom application, with most useful first projects landing between £3,000 and £15,000. Those are indicative bands rather than quotes. The biggest variable is not the AI. It is how many of your own systems the tool has to read from and write to.
A fixed price on day one usually means someone has guessed. Good suppliers give you a range, then narrow it after a short discovery phase.
What are the typical AI development cost bands?
Four bands cover most small business work. A simple automation, such as sorting an inbox and drafting replies, typically costs £1,000 to £4,000. An internal assistant that answers staff questions from your documents usually sits at £3,000 to £10,000. An integration that moves data between your CRM, accounts and booking tools with AI in the middle runs £5,000 to £20,000. A custom application with its own interface, user accounts and reporting starts around £15,000 and can climb past £50,000.
Agencies and freelancers price differently. A freelancer may undercut an agency by a third, and may also disappear. Ask who will maintain the tool in a year.
Why do discovery and a proof of concept come first?
Because you are buying certainty. Discovery is a short, paid piece of work, usually £500 to £2,500 over a few days, where the supplier maps your process, sees real examples and flags risks. A proof of concept is a rough working version tested on your actual data, often £1,500 to £5,000 depending on scope.
The aim is to find out cheaply whether the idea works. If the tool gets 60 percent of enquiries right in the trial and you need 95, you have learned that for a few thousand pounds, not fifteen.
Many people resist paying for discovery. It is the best money in the project.
What actually drives the cost of a custom AI tool?
Integration, then data quality, then the level of reliability you demand. Connecting to a modern system with a documented API is quick. Connecting to a decade-old industry package with no interface can double the build. Messy, inconsistent source documents need cleaning before any model can use them, and that is labour.
Reliability costs too. A tool that drafts replies for review can be wrong sometimes. A tool that acts alone, such as sending quotes or updating records, needs testing, logging and fallback rules. The more you let it do unsupervised, the more you pay to prove it is safe.
User interface is the other lever. A tool that lives inside Slack, email or a spreadsheet you already use is far cheaper than a new web app with logins.
What are the running costs after launch?
Expect three ongoing lines. Model usage is billed by volume, and for a typical small firm lands between £10 and £200 a month. Hosting and monitoring add £10 to £100. Maintenance, meaning fixes, prompt updates and changes when a supplier alters its service, runs at roughly 10 to 20 percent of the build cost per year, or a retainer of £100 to £500 a month.
Ask for these figures in writing before build starts. A £6,000 tool with £400 a month in upkeep has a different payback from one with £60.
How do you cap the risk on an AI project?
Stage the work and keep each stage small. Pay for discovery, then a proof of concept, then a pilot with a handful of users, and only then a full roll-out. Set a pass mark in advance, such as “drafts need fewer than two edits in 80 percent of cases”. Agree what happens if it falls short, including whether you keep the code.
Insist on ownership. The code, prompts and documentation should belong to you, and the tool should run in accounts you control. Otherwise you are renting your own process.
Fixed price for each stage, not for the whole thing, tends to work best. It keeps both sides honest.
Is a custom build better value than a subscription tool?
Often not, at first. A £30 a month subscription that does 80 percent of the job beats a £10,000 bespoke tool that does 95. The question is what the last 15 percent is worth to you. If your team spends twenty hours a week on the task and the subscription leaves half of that untouched, the custom route pays back within a year. If it is two hours a week, it never will.
Our guide to ChatGPT versus a custom AI tool works through that decision. If you are only thinking about a website bot, the pricing differs and is covered in what an AI chatbot costs in the UK.
How do you compare AI quotes fairly?
Picture two quotes for the same Leeds distributor: £4,000 from a freelancer and £6,500 from an agency. The freelancer excludes testing and support. The agency includes six weeks of tuning and a handover document. On a three-year view the dearer quote is usually the cheaper one.
Line them up on the same six points: what is included, who owns the output, what the running costs are, how success is measured, what testing is done and what support follows launch. A quote of £4,000 with no maintenance and no testing is not cheaper than £6,500 with both.
Be wary of anyone who promises results before seeing your data, or who quotes a price after a ten minute call. Read how to choose an AI company in Leeds for what to ask, and see what AI can automate in a small business if you are still deciding on a first project. When you are ready to scope one, our AI development service starts with discovery.
Frequently asked questions
What is the cheapest sensible way to start?
A paid discovery day and a small proof of concept on one process.
Can I get grants for AI projects?
Sometimes. Regional growth and innovation schemes change often, and eligibility is narrow, so check current options through your local growth hub or the West Yorkshire Combined Authority business support pages. Do not build a budget around a grant you have not been awarded, and never let a consultant take a success fee before you have read what exactly they will apply for.
Is AI development expensive because of the technology?
No. People cost more than models.
How long does an AI project take?
A simple automation takes one to three weeks. Assistants and integrations take four to ten, and a custom application takes three to six months. Delays almost always come from waiting on access, data and decisions from the client side, so assign someone on your team who can answer within a day.
Do I pay more if the AI needs to be accurate?
Yes, because accuracy means testing. Testing takes time, and time costs money. Worth every pound where mistakes are costly.
Send us a description of the process you want to improve and how often it happens, and we will give you a realistic range and the cheapest way to test it.
