How Much Does an AI Chatbot Cost in the UK? 2026 Price Guide
In 2026, the AI chatbot cost in the UK generally ranges from about £20 a month for an off-the-shelf chatbot to £40,000 or more for an advanced custom build. First, an off-the-shelf chatbot is a ready-made chatbot that you subscribe to. Second, a custom chatbot, by contrast, is made for one particular business, and its build cost ranges from about £2,500 for a basic FAQ bot to £40,000+ for a multi-channel chatbot connected to your CRM.
In addition, the build time of any AI chatbot depends on how advanced it is. A basic FAQ bot, which answers a fixed set of common questions, can launch in 2 to 3 weeks, while an advanced custom chatbot takes 8 to 14 weeks.
3 Factors That Set the Price of an AI Chatbot
I. Tool type: for instance, you can buy an off-the-shelf chatbot at a lower price or order a custom build at a higher price.
II. Connected systems: likewise, the price changes with the number of systems the chatbot connects to and the integrations it supports.
III. Number of conversations: finally, the price also changes with the number of conversations the chatbot handles each month.
AI Chatbot Cost in the UK in 2026 by Chatbot Type
| Type of chatbot | Build cost | Monthly running cost | Build timeline |
|---|---|---|---|
| AI chatbot configured on another chatbot platform | £1,500 to £8,000 | £75 to £500 | Up to 3 weeks |
| Rule-based or basic FAQ chatbot (custom) | £2,500 to £5,000 | Under £300 | Up to 3 weeks |
| Professional AI chatbot (LLM, your documents, one integration, web and WhatsApp) | £5,000 to £15,000 | £370 to £1,080 | Up to 6 weeks |
| AI chatbot with multiple channels and CRM/ERP integrations | £15,000 to £40,000 | £300 to £1,500 | 8 to 14 weeks |
| Enterprise AI chatbot | £40,000 to £300,000+ | Scoped per project | 6 to 11 months |
Also, for comparison, see how the AI chatbot cost in Dubai stacks up.
Choosing Between a Rule-Based Chatbot and an AI Chatbot
- Rule-based chatbot: First of all, a rule-based chatbot guides customers through fixed menus and pre-written scripts. As a result, it costs less to build and gives the same answer every time. However, it cannot reply when a customer asks something its scripts do not cover.
- AI chatbot: In comparison, an AI chatbot is built on a large language model (LLM), which is software trained to read and write natural language. Instead, it understands questions that customers type in their own words and answers them from your own documents. As a result, it costs more to build, but it resolves many more customer queries without a human agent stepping in.
Choosing Between an Off-the-Shelf Chatbot and a Custom AI Chatbot
- Off-the-shelf chatbot: It's a ready-made product you set up instead of building. Therefore, if your chatbot only answers common questions on your website, start with an off-the-shelf chatbot.
- Custom AI chatbot: On the other hand, a custom AI chatbot can handle complex queries specific to your business. So, if your chatbot needs to qualify leads, book appointments, look up orders or hand over to your team with full context, a custom-built chatbot is better.
To sum up, here is a detailed overview of both:
| Aspect | Off-the-shelf chatbot | Custom AI chatbot |
|---|---|---|
| Upfront cost | Up to £500 | £5,000 to £40,000+ |
| Monthly cost | Increases with the number of users and conversations | Depends on hosting, API usage and support required |
| Answers from your own content | Minimal | Complete: documents, policies, product data and more |
| Integrations | Limited to the tool's own connectors | Can connect to any system that has an API |
| Data control | Stays with the vendor | You choose where data is stored |
| Best for | FAQs | Lead generation, bookings, support and sales at volume |
Monthly Running Costs of an AI Chatbot in the UK
Furthermore, the AI chatbot cost in the UK doesn't stop at launch. Running a chatbot costs money every month, so add those monthly costs to your budget before you start the build. Typically, if you're an SME in the UK, expect to pay about £370 to £1,080 a month in total for a professionally maintained AI chatbot.
| Running cost | SME (monthly) | Enterprise (monthly) |
|---|---|---|
| Hosting | £50 to £200 | £300 to £800 |
| API usage | £20 to £80 for about 500 conversations | £200 to £500 for about 5,000 conversations |
| Support and improvement retainer | £300 to £800 | Scoped per contract |
| WhatsApp messaging fees | Charged per message by Meta (see below) | Same rates |
Notably, on WhatsApp, Meta has charged per message rather than per conversation since July 2025. For instance, in the UK, utility messages (such as booking confirmations) cost about 2p each and marketing messages about 4p or more. Meanwhile, replies to customers who message you first are free for the first 1,000 a month per phone number, and charged after that.
What Drives the AI Chatbot Cost in the UK?
Overall, these 7 factors set the AI chatbot cost in the UK:
I. Off-the-shelf vs custom AI chatbot
At first, off-the-shelf tools are cheap to start, but they charge per seat and per conversation and limit how far you can customise the chatbot. Custom builds, on the other hand, cost more upfront but fit your workflows and data.
II. Integrations
Typically, each connection to a CRM, helpdesk, booking system or ERP adds roughly £800 to £3,000. In return, these connections let the chatbot complete tasks such as booking, updating or refunding for customers, as well as answering their questions.
III. Channels
Generally, website chat is the cheapest channel. However, WhatsApp, Instagram, Slack and mobile apps each add setup work, and WhatsApp also charges a fee per message.
IV. Knowledge base size and quality
For example, a chatbot that answers from 20 tidy FAQ pages is quick to build. In contrast, a chatbot that answers from thousands of PDFs, policies and product records needs a retrieval system, testing and safeguards against wrong answers, which adds to the development cost.
V. Conversation volume
Naturally, API costs rise with usage, so 50,000 conversations a month cost far more to run than 500 because every reply uses the AI model.
VI. Voice
Similarly, phone-based AI agents add speech recognition and telephony costs. So, if you are deciding between voice and text, read our comparison of voice AI vs text chatbots.
VII. UK GDPR and security
Compliance work also adds cost to the project. Specifically, chatbots that collect personal data need a lawful basis, a privacy notice, data retention rules and a data processing agreement with every provider, including the AI model provider, as the ICO's UK GDPR guidance explains.
How Gravity Base Builds AI Chatbots for UK Businesses
As a UK-focused team, Gravity Base offers AI chatbot development in London and across the UK. So far, the company has built 30+ AI chatbots and has automated more than 1 million customer conversations.
For example, our AI chatbots answer customer questions from the business's own content, capture leads, book appointments and log every conversation into the business's CRM, the system where it tracks its customers. Moreover, they run on websites, WhatsApp, mobile apps, Slack and other social channels.
Besides that, if you need an AI system that does more than answer questions in a chat window, our AI automation agency in London can connect the chatbot to your workflows. Otherwise, get in touch with our AI development company in London, and we will build an AI chatbot that fits your business.
Next, read our guide to AI development cost in the UK to understand pricing for other AI projects. Then, if you are comparing vendors, see our list of the top AI development companies in London.
Want an exact price for your chatbot? Book a consultation. During the consultation, first we list the channels your chatbot will run on, the tools it must connect to and the monthly running costs.
Prices and WhatsApp messaging fees were checked in November 2026.
Frequently Asked Questions
How much does a simple chatbot cost in the UK?
A simple chatbot comes in 3 types in the UK:
- Off-the-shelf tool: a ready-made chatbot you pay for monthly, from about £20 to £300 a month.
- Custom rule-based FAQ bot: replies to common questions with answers written in advance, for £2,500 to £5,000.
- AI chatbot that answers from your own documents: reads your files and writes its replies from them, for £5,000 to £15,000.
How much does it cost to build a custom AI chatbot?
A professional build with one integration costs £5,000 to £15,000. With multiple channels and deep CRM or ERP integration, the cost rises to £15,000 to £40,000. Meanwhile, an enterprise conversational platform starts at £40,000.
What are the monthly costs of running an AI chatbot?
On average, for an SME, running an AI chatbot costs about £370 to £1,080 a month. In short, that total covers hosting, AI model usage and a support retainer.
How long does it take to build an AI chatbot?
A basic FAQ bot takes 2 to 3 weeks, and a professional AI chatbot takes 4 to 6 weeks. An advanced multi-channel chatbot, however, takes 8 to 14 weeks.
Is an AI chatbot GDPR compliant?
Yes, if it is built around UK GDPR from the start. That means a lawful basis for using personal data, a clear privacy notice, limits on what the chatbot stores and for how long, and a data processing agreement with every provider, including the AI model provider.
Can an AI chatbot work on WhatsApp in the UK?
Yes. A UK business can run an AI chatbot through the WhatsApp Business Platform, which Meta provides for companies. In that case, you pay for setup work, plus Meta's per-message fees for utility and marketing messages.