"I built my whole website in an afternoon, and it cost me nothing." I hear a version of this most weeks. Someone has opened Lovable, Bolt or v0, typed a few prompts, watched a slick site appear, and pointed it at a free subdomain. It looks the part. It feels like a result. And for a hobby project, it often is one.
The trouble starts the moment that free site has to behave like a real business — take a payment, send an order confirmation, sit on your own domain, and not quietly break UK data protection law. That is where "free" turns into a stack of small invoices and a few hours of your weekend you will never get back. In this article I will pull apart what a "free" AI website actually costs in the UK, line by line, in pounds and pence — so you can decide, with open eyes, when free is fine and when it is the most expensive option on the table.
Why "free" only looks free on day one
The free part of an AI website builder is the bit that is cheap to give away: generating pages from a prompt. That is genuinely impressive and genuinely costs you nothing. What it does not include is everything that makes a website a working asset rather than a demo.
It is the classic vibe-coding pattern — the tool gets you 80% of the way in an afternoon, and the last 20% is the hard part that quietly costs money. The page renders beautifully on the builder's preview. Then you want it on yourdomain.co.uk, with email that doesn't land in spam, a payment button that actually settles into your bank, and a cookie banner so you're not breaking the law. None of that is in the free tier, and each piece has a price.
The real cost, broken down line by line
Domain
A free AI site lives on something like my-app.lovable.app. No real business runs on that. A proper .co.uk or .com costs roughly £8 to £15 a year through Cloudflare, Namecheap or 123-Reg, with renewals creeping up after the first year. Small, but it is the first line item that makes "free" untrue.
Hosting or a paid platform tier
Free tiers throttle you: a custom domain, more bandwidth, removing the builder's badge, or any server-side feature usually requires the paid plan. Expect £15 to £30 a month (~€18 to €35) on a hosted builder, or a more modest £0 to £20 a month if a developer deploys the same thing to Vercel, Netlify or Cloudflare Pages. Either way, "free" now has a monthly direct debit attached.
Business email on your domain
A Gmail address on your shop's checkout reads as amateur and lands in junk folders. Email at hello@yourbusiness.co.uk means Google Workspace or Microsoft 365 at around £5 to £12 per user per month plus VAT, with SPF, DKIM and DMARC set up so your order confirmations actually arrive. AI builders never do this part for you.
SSL certificate
The one bit of good news: HTTPS is genuinely free now via Let's Encrypt, and every serious host includes it. The hidden cost is when an AI build misconfigures it — mixed content warnings, an expired cert nobody renewed, or a checkout that browsers flag as "Not secure". Fixing that is a developer hour, not a product you can buy.
Payment fees
This is the big one people forget. The website being free does not make taking money free. In the UK that means Stripe at roughly 1.5% + 20p per card transaction, PayPal a bit higher, Apple Pay and Google Pay expected at checkout (around 40% of online purchases use a wallet), and buy-now-pay-later options like Klarna or Clearpay charging more again. GoCardless handles Direct Debit for subscriptions at about 1% + 20p, capped at £4. On £5,000 of monthly sales you are looking at £85 to £150 a month in fees alone — every month, forever.
GDPR, cookies and ICO registration
UK GDPR and the Data Protection Act 2018 apply to every business — there is no small-business exemption. If your site sets analytics or advertising cookies (and AI builds almost always inject Google Analytics with no banner), PECR requires consent before they load. You also need a privacy policy with a lawful basis, and most businesses must register with the ICO and pay the annual data protection fee (£40 to £60 for a small organisation). An AI site ships none of this by default, and "I didn't know" is not a defence the ICO accepts.
SEO and being found
A site nobody can find is a very expensive business card. AI builders generate generic meta tags, thin content, bloated markup and often a structure Google struggles to crawl. Making it actually rank — proper titles, structured data, fast loading, real content — is either your time or a one-off SEO setup of £500 to £2,000 plus VAT. There is no free version of being visible.
Maintenance, updates and content
Software rots. Dependencies go out of date, a payment provider changes its API, a browser update breaks a layout, content goes stale. With no developer, the first time something breaks you are either down or paying a UK day rate of £400 to £650 plus VAT to someone who has never seen the codebase. That unpredictability is the real tax on a "free" build.
What it adds up to per year
Here is what a small but genuine UK business site typically spends in a year — before a single fix, and not counting your own time:
So the honest number for "free" is roughly £350 to £900 a year in tooling for a modest business site, plus payment fees scaling with revenue, plus a few unpredictable developer days whenever something breaks. Not ruinous — but a long way from £0, and worth knowing before you build a business on it.
"Free" vs professional: the real total cost of ownership
The useful comparison is not the build price — it is the total cost of ownership over a year or two, including your time and your risk. Here is how the two stack up.
| Aspect | "Free" AI website | Professional build |
|---|---|---|
| Upfront price | £0 | £800 to £8,000 + VAT (~€940 to €9,400) |
| Domain & email | You wire it up, or it's missing | Configured, SPF/DKIM/DMARC done |
| Payments | Same card fees, often misconfigured | Hosted Stripe/PayPal, PCI-DSS out of scope |
| GDPR & cookies | Usually none — a real liability | Privacy policy, consent, ICO sorted |
| SEO | Generic, hard to rank | Built in from the start |
| When it breaks | Down, or pay a stranger to learn it | Someone who owns the outcome |
| Your time | Hours of fiddling, ongoing | Largely off your plate |
| 2-year TCO | £700 to £1,800 + your hours + risk | Build + ~£400 to £900/yr running |
Free wins on day one. Over two years, once you price in your own hours and the cost of being down or non-compliant, the gap narrows fast — and for a revenue-generating site it usually flips.
When free is genuinely the right call
Free is fine when…
It's an experiment. You're validating an idea and want to see if anyone cares before spending money. Vibe-coding an MVP to test demand is exactly what these tools are good for.
It's a hobby or personal page. A portfolio, a side project, a coming-soon holding page — no payments, no customer data, no reputation on the line.
Nobody is paying you through it. If there is no checkout and no personal data being collected, the compliance and reliability stakes are low. Stay free, and enjoy it.
I genuinely encourage founders to start here. Validating cheaply with an AI build before committing to a "grown-up" version is smart, not lazy. The mistake is staying free a beat too long.
When "free" quietly costs you a fortune
Free gets expensive when…
You're taking real money. A broken checkout, a failed payment, a wallet that won't load — every one is a lost sale, and you can't fix what you can't read.
You're handling customer data. No privacy policy, no cookie consent, no ICO registration, insecure Supabase or Firebase rules left wide open — that is a data breach and an ICO complaint waiting to happen.
Your reputation depends on uptime. If the site being down or hacked costs you customers and trust, "I'll deal with it when it breaks" is a gamble with your business.
You've outgrown the tool. The AI build validated the idea, demand is real, and now the last 20% — security, performance, integrations — is the part the builder can't do. That's the moment to rebuild for production.
The UK tax and compliance angle people miss
Two things specific to running a business in the UK that no AI builder will set up for you. First, VAT and Making Tax Digital: if you're VAT-registered, HMRC requires digital records and returns through approved software — Xero, QuickBooks Online, Sage, FreeAgent or a bridging tool. Your shiny AI site does not feed that; you'll wire it to your accounting stack yourself, or pay someone to. From April 2026, MTD for Income Tax also starts phasing in for sole traders and landlords, so the digital-records expectation is widening.
Second, e-invoicing is coming. Mandatory B2B and B2G e-invoicing is confirmed for around April 2029, most likely on the PINT UK (Peppol / EN 16931) standard — and the public sector and NHS already use Peppol today. 2026 is the consultation and roadmap phase, not live yet, but if you sell to government or large enterprise, building on something you can't extend to support structured e-invoices is a corner you'll have to un-paint later. A free AI front end gives you no path to any of this.
How I look at it
I'm not anti-AI — I use these tools myself, and a good vibe-coded prototype can save weeks of validation. What I'm against is mistaking a free demo for a finished, safe, sellable product. The pattern I see constantly: a founder validates cheaply in Lovable or Bolt, gets real traction, then realises the "free" site can't take payments safely, breaks UK data law, and falls over under real traffic. At that point the cheapest path was never free — it was the professional build they'd talked themselves out of.
If you've started with AI and you're stuck on the real costs — the compliance, the payments, the things that break — that's exactly the bridge I help people across. I cover when to rebuild versus patch in why your Lovable, Bolt or v0 code broke, and the payment side in why AI won't connect your payment integrations. For a proper, production-ready site there's also my website development service, and the broader app development page if you're past a marketing site.
Started with AI and stuck on the real costs?
Send me a link to your AI-built site. I'll give you a plain-English health check — what's safe, what isn't, and what it actually costs to run — with a fixed quote, no hard sell.
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The short version
A "free" AI website is a brilliant way to test an idea and a poor way to run a business. The build costs nothing; the domain, hosting, email, payment fees, GDPR compliance, SEO and the inevitable fixes all do. Used for what it's good at — experiments, hobbies, validation — free is exactly right. The day money and customer data start flowing through it, "free" becomes the most expensive option you didn't budget for. Know which side of that line you're on, and the decision makes itself.