6 October 2026
How much does a custom business app cost in the UK?
There's no single number that fits every project. Here's what actually drives the cost of a custom web or mobile app for a UK small business.
“How much will it cost?” is usually the first question a small business asks when they start thinking about custom app development, and it’s a reasonable one to ask early. The honest answer is that there isn’t a single figure that applies to every project — a simple internal tool and a customer-facing booking platform with payments, logins and integrations are different projects with different costs. What’s more useful than a number is understanding what actually drives it, so you can scope a sensible first version and get a quotation that makes sense.
The variables that matter most
Number of user journeys. A tool with one or two clear jobs — log a job, generate a report — costs less to build and test than a system with many different paths for different user types (staff, customers, administrators).
Integrations. Connecting to existing software — a CRM, accounting package, payment provider or booking calendar — adds real value, but each integration needs to be scoped, built and tested against that system’s own quirks and limits.
Permissions and roles. An app used only by your own team is simpler than one with different access levels for staff, managers and external customers, each needing the right information and nothing more.
Data requirements. Migrating existing data from spreadsheets or an old system, validating it, and making sure the new application handles edge cases properly all take time that’s easy to underestimate.
Platform. A responsive web application is often simpler to build and maintain than a native mobile app, though the right choice depends on how and where the app will be used — we cover this in more detail in our web app vs mobile app guidance.
Why we don’t quote a price range upfront
Publishing a generic price range for “a custom app” would be more misleading than helpful, because it would either be so wide it tells you nothing, or specific enough that it sets the wrong expectation before we understand your actual requirements. Instead, we scope the project first: what the first useful version needs to do, which integrations are genuinely necessary, and where the complexity really sits. That scoping conversation is what a quotation is for.
A cheaper way to find out: start smaller
You don’t need to commission a full transformation programme to get a useful answer. If you can describe the single workflow causing the most friction right now — the spreadsheet five people edit, the booking process that runs through email, the manual report that takes half a day each month — that’s usually enough for us to give you a grounded view of scope and cost for a first version, rather than a guess for an imaginary “full” system.
Before you ask for a quote
It helps to have a rough answer to a few questions before your first conversation:
- What does the process look like today, step by step?
- Who uses it, and do they need different levels of access?
- What other systems does it need to work with, if any?
- What would “good enough to launch” look like, versus “nice to have later”?
You don’t need polished answers — just enough to give us a starting point. From there we can scope the project properly and provide a quotation with a clear breakdown of what’s included and where the cost comes from. If you’d rather see worked examples of ongoing website pricing first, our pricing page sets out starting points for website projects of varying scope — the same scoping principles apply to custom application work.