How Much Does It Cost to Build a SaaS MVP in the UK?

Ask this question on a forum and you'll get answers from £3,000 to £150,000, all confidently stated as fact. That range isn't wrong exactly, it's just useless. The number depends entirely on what you mean by "MVP", and most people asking the question haven't decided that yet. So let me give you something more useful than a single figure: what actually drives the cost, and how to keep it down without cutting the wrong corner.

The honest range

For a proper SaaS MVP built by an experienced UK developer, working directly with you rather than through an account manager, you're typically looking at somewhere between £8,000 and £35,000. That covers a real first version: user accounts, a core workflow that solves one problem well, a database, basic admin tools, and something you can put live in front of paying customers.

Below that range, you're usually looking at a no-code tool, an AI prototyping platform, or a very narrow slice of functionality. Above it, you're paying for either genuine complexity (payments, multi-tenant permissions, integrations with several third-party systems) or agency overheads that have nothing to do with the actual build.

Where you land inside that range depends on four things.

1. How many "small" features you're actually asking for

Nobody scopes a SaaS MVP and asks for one feature. They ask for a login system, a dashboard, a settings page, team invites, an activity log, email notifications, a billing page, and "some basic reporting." Each of those is small on its own. Together they're most of a proper product.

The single biggest cost lever is deciding what a real user needs on day one versus what would be nice eventually. Team invites and role permissions, for instance, matter enormously if you're selling to businesses with several staff. They matter far less if your first ten customers are all sole traders. Cut the ones that don't matter yet and the quote drops fast.

2. Payments and billing

Stripe integration sounds like a tick-box job because Stripe's own docs make it look simple. In practice, subscription billing brings its own list of edge cases: upgrades and downgrades mid-cycle, failed payments and retry logic, proration, VAT handling if you're selling to EU customers, and what happens to a user's account the moment their card fails. None of this is hard, but it all needs building and testing properly, and it's usually where an MVP quote picks up a few thousand pounds.

If you genuinely don't need to charge on day one, a "coming soon, join the waitlist" or manual invoicing approach for the first cohort can delay this cost until you've validated demand.

3. Whether it's genuinely new, or an AI-built prototype being made production-ready

A growing number of founders arrive having already built something in Lovable, Bolt or Replit. That's not a bad starting point, it proves out the idea and the interface fast. But a prototype built by an AI tool usually needs proper authentication, sensible database structure, real error handling, and a security review before it can safely hold customer data and take payments. That work is cheaper than building from nothing, because the UI and flow are already decided, but it's still real work, and skipping it is how MVPs end up with data leaking between accounts. I've written more about turning an AI-built prototype into something production-ready if that's your starting point.

4. Who's actually building it

Agencies quote higher for the same scope because you're paying for project managers, account handlers and a bigger overhead, not more development hours. Cheap offshore freelance platforms quote lower, but you're often getting a junior developer, a rewritten quote halfway through, or code nobody can maintain six months later. An experienced individual, working directly with you, sits in between: no handoffs, no translation layer, but a realistic day rate because the work is genuinely yours from first conversation to launch.

What the quote should actually include

• A working product you can put real users in front of, not a clickable prototype
• Code you own outright, not licensed access to someone else's platform
• Basic admin tools so you're not asking a developer to manually fix data every week
• A plan for hosting, and a rough monthly running cost once it's live
• Clarity on what happens after launch: who fixes a bug found in week three, and what that costs

That last point catches people out. A fixed MVP price rarely includes ongoing support, and it shouldn't, because you don't know yet what real users will break or ask for. Budget separately for a few months of iteration after launch. This is usually where the product actually gets good, once real usage tells you what matters.

Scoping it down without gutting it

The cheapest way to reduce a SaaS MVP quote isn't to negotiate the day rate, it's to genuinely cut scope. Pick one user type, not three. Pick one core workflow that has to work brilliantly, and let everything else be basic or manual for now. A booking system I built recently launched with card payments and reminders working perfectly, and left more advanced reporting for a later phase, because the trades using it needed to get paid, not run analytics, in month one.

If you're not sure yet what's core and what's optional, it's worth working that out on paper before you get a quote at all. My free tool that turns a rough idea into a development-ready brief is built for exactly that stage, and a clear brief tends to bring the number down because there's less guesswork for a developer to price around.

If you want a straight answer on what your specific idea would cost, that's a better conversation to have directly than to guess from a range on a blog post. Have a look at how I approach SaaS MVP development, and get in touch when you're ready to talk specifics.