If you are reading this, you probably have an idea and one question on your mind: what is this going to cost me?
Fair question. Most agencies dodge it. They say "it depends" and ask you to book a call before they tell you anything useful. So here is the honest version, with real numbers, before any sales pitch.
The short answer
A bespoke app in the UK usually falls into one of three brackets. These are rough market ranges, not quotes, but they will help you budget before you talk to anyone.
| What you are building | Typical UK range |
|---|---|
| A simple app, internal tool, or first working version (an MVP) | £5,000 to £15,000 |
| A mid-sized app with user accounts, custom logic and a few integrations | £15,000 to £50,000 |
| A larger platform with several user types, complex data and room to scale | £50,000 and up |
Where you land has less to do with the idea and more to do with what the app actually has to do. A clean tool that does one job well sits at the lower end. A platform that plugs into your other systems and serves thousands of people sits at the top.
What actually drives the price
Five things move the number more than anything else.
Features. Every screen, button and rule is work. An app that captures a form and emails it to you is cheap. An app that calculates, schedules, and makes decisions is not. The more it does, the more it costs.
Integrations. If your app needs to talk to your CRM, your accounting software, a payment provider or a supplier feed, each connection is a small project of its own. Two or three integrations can add real money.
User types. One kind of user is simple. The moment you have admins, staff and customers all logging in to see different things, you are building three apps that share a back end.
Design. A plain, tidy interface is quick. A polished, branded experience with custom animation and a designer involved takes longer. Both are valid. They just cost different amounts.
Data and security. Storing personal data brings GDPR duties, and that means doing things properly. It is not expensive on its own, but it is not free either, and it is not somewhere to cut corners.
Why "it depends" is the honest answer, not a cop-out
Here is the part most people miss. The same idea can cost five thousand pounds or fifty thousand pounds.
"A booking app" could be a single calendar that takes deposits, or it could be a system that manages staff rotas, sends reminders, handles refunds and reports on no-shows. Same two words, wildly different builds.
That is why no honest developer can give you a real figure from a one-line description. What they can do is sit down with you for twenty minutes, work out what the app truly needs to do, and then give you a fixed price for that.
How to spend less without cutting corners
You do not have to build everything at once. The cheapest mistake is trying to.
- Start with the one job that matters. Build the smallest version that solves the real problem, and get it in front of people. You will learn more from a week of real use than a month of planning.
- Phase it. Launch version one, let it prove its worth, then fund version two from the time or money it has saved you.
- Reuse what you already pay for. If you already have a tool that handles payments or email, we connect to it rather than rebuild it.
- Keep the user types simple to begin with. You can add the admin dashboard or the customer portal later, once the core works.
Done well, a first version can cost a fraction of the full vision and still earn its keep from day one.
Fixed quote, not a meter running
One thing to watch for: developers who charge a day rate with no ceiling. The clock runs, the scope drifts, and the final bill is a surprise. That is not how we work.
At Marvanova, bespoke app development follows a simple path. We have a conversation about what you need. We scope it out and give you a clear, fixed price before any work starts. Then we build, keep you in the loop in plain English, and support it after launch. You know the number before you commit.
Is a bespoke app actually worth it?
Off-the-shelf software is the right call a lot of the time. It is cheaper and faster, and if it fits how you work, use it.
Bespoke earns its place when the off-the-shelf option almost fits but forces you into awkward workarounds, or when nothing on the market does the specific thing your business does. The cost to weigh it against is not zero. It is the hours your team loses every week to manual work and clunky systems.
A simple sum: if a custom tool saves one person a day a week, that is roughly fifty days a year. Put your own day rate against that and the build often pays for itself well inside the first year.
Questions people ask
Why won't agencies give a fixed price up front?
Because the price depends on what the app has to do, not the idea itself. The same idea can cost five thousand or fifty thousand depending on features, integrations, user types and data. A short scoping conversation lets us give you a fixed quote rather than a vague guess.
How long does a bespoke app take to build?
A simple tool or first version can be ready in a couple of weeks. A larger app takes longer. You get a realistic timeline as part of the quote, so there are no surprises.
Do I need to be technical to get one built?
No. Most of the people we build for are not technical at all. Your job is to know your business. Ours is to handle the software and explain it in plain English.
Is it only for businesses?
No. We build for businesses and individuals. If you have an idea worth testing, it is worth a conversation.
If you have an idea and want a straight answer on what it would cost, tell us what you want to build and we will scope it with you. No jargon, no obligation.