The short answer
For a typical UK small business — a trades firm, a clinic, a restaurant, a local agency — a genuinely useful AI chatbot on your website costs between £50 and £450 a month, depending on who builds it and what it's trained to do. Below that you're buying a DIY widget that eats your evenings. Above that you're paying enterprise money for problems a ten-person business doesn't have.
The three price tiers, honestly
Almost every chatbot on the market falls into one of three buckets. Knowing which one you're being sold does most of the work.
1. DIY builders: free to £50 a month
These are the sign-up-and-configure-yourself tools — many started as simple rule-based widgets and have bolted AI on since. The free tiers are fine for testing an idea: a bubble in the corner of your site that answers a handful of pre-written questions.
The catch is in the name. You write the conversation flows, you maintain them every time your prices or hours change, and when a customer asks something you didn't script — which is most of the interesting questions — it either gives up or guesses. The useful parts (real AI answers trained on your business, lead capture, removing the vendor's logo) are held back for paid tiers, and per-seat pricing creeps up as you grow. The real cost here is your time, and the enquiries a bad chatbot quietly loses.
2. Managed AI assistants: £150 to £450 a month
This is the tier most UK small businesses actually want, even if they don't know it yet. An agency builds an assistant trained on your real content — your services, your prices, how you handle bookings — and maintains it when things change. It answers like someone who works for you, because in a sense it does.
In our own research, managed AI assistants in the UK typically run £175 to £400 a month, and that's the honest middle of the market. Setup fees vary wildly: some agencies bury £500+ of build work in the small print, others include it. Ask, in writing, what the first invoice and the twelfth both look like.
3. Custom AI agents: £5,000 to £40,000+, plus running costs
At the top end, agencies build fully custom AI agents wired into your CRM, your booking system, your stock. This is genuine engineering, and it's priced like it: typically £5k–£40k to build plus £200–£800 a month in model usage, hosting and maintenance.
For most small businesses this is paying to solve problems you don't have yet. If you're not sure whether you need this tier, you don't. A good managed assistant will tell you when you've outgrown it, because the conversation data shows exactly what customers keep asking for.
| Tier | Typical cost | Who maintains it | Best for |
|---|---|---|---|
| DIY builder | Free – £50/mo | You do | Testing whether you want one at all |
| Managed AI assistant | £150 – £450/mo | Your agency | Most small service businesses |
| Custom AI agent | £5k – £40k build, then £200 – £800/mo | A dev team | CRM, stock or booking integration at scale |
What actually drives the price
Five things separate a £20 widget from a £400 assistant:
- Knowledge. An assistant trained on your whole business — services, prices, policies, tone — costs more to build than one answering ten FAQs. It's also the difference between "I'll get someone to email you" and actually helping.
- Integrations. Checking availability, taking bookings, pushing leads into your CRM — each connection is real work.
- Human handoff. A good assistant knows when to stop and get you. A cheap one keeps guessing.
- Maintenance. Prices change, hours change, services change. Someone has to keep the assistant accurate — ask who that is.
- Where it runs. Customer conversations are personal data. If they're processed outside the UK you need a data-processing agreement and a lawful transfer route — the ICO's international transfers guidance sets out what that means. Reputable UK suppliers have this ready; silence on the question is your answer.
The hidden costs nobody puts on the pricing page
Before you sign anything, get written answers on all of these:
- Per-conversation billing without a cap — a busy month doubles your invoice.
- Setup fees quoted separately from the headline monthly price.
- A chatbot trained on nothing — it will confidently invent your prices and opening hours, which is worse than having no chatbot.
- No route to a human — customers who hit a wall need a phone number, not a loop.
- Lock-in — check what happens to your knowledge base if you leave.
What we charge (and why it's less)
We run managed AI assistants for Leeds businesses at £49 a month as an add-on to any of our packages — or swapped in place of social media at the same price, if social isn't your thing. The knowledge-base build, the part most agencies charge setup fees for, is included in the standard £249 onboarding (or £49 one-time if you add it to an existing site later).
It's cheaper than the market middle because of how we work, not what we skimp on: we build sites for these same businesses, so we already have your content, your structure and your tone in hand. The assistant is trained on the same material your website is built from — one source of truth, no re-inventing your business from a discovery call.
You can see exactly what's included on our AI Website Assistant page, including what it does, how the handoff works, and the questions it can't answer.
How to decide, in one paragraph
Start by looking at your inbox and your missed calls. If customers ask the same handful of questions — prices, availability, "do you cover my area?" — an assistant pays for itself in reclaimed evenings. If your enquiries are rare and bespoke, spend the money on getting found first instead. And if a supplier can't explain their pricing in one plain sentence, that's not a pricing page, it's a fog machine — walk away. The same honesty test we apply to website costs applies here.