How Much Does It Cost to Build a Mobile App in the UK? (2026 Guide)
Ask ten UK agencies what a mobile app costs and you'll get ten different numbers, mostly because they're quoting for different things. Here's what actually drives the price, and what you should expect to pay at each stage.
Realistic price ranges
For a proper, working app (not a prototype), budget within these bands:
- Simple MVP (one core feature, basic auth, a handful of screens): £15,000–£40,000
- Mid-complexity app (multiple features, backend API, payments, push notifications, admin dashboard): £40,000–£90,000
- Complex app (marketplace, on-demand/logistics, fintech, real-time features, heavy integrations): £90,000–£250,000+
UK day rates sit roughly at £350–£600 for an experienced freelance developer and £800–£1,500 for an agency team day (which usually bundles design, dev, PM and QA). A basic MVP is typically 30–60 development days; anything with real backend complexity climbs fast from there. Be wary of quotes well below these ranges — they usually mean offshored work with limited accountability, or a scope that will balloon once you start.
What actually drives the cost
It's rarely the number of screens. The things that move the budget are:
- Backend complexity — an app with its own database, business logic and admin panel costs far more than one that's a thin wrapper round an existing API.
- Integrations — payments (Stripe/Apple Pay), maps, calendars, third-party CRMs and especially anything involving real-time data (chat, live tracking) all add weeks.
- Design maturity — a from-scratch UX/UI design process with user testing adds cost but saves you from an expensive rebuild later. Skipping it is a false economy.
- Offline support and sync — genuinely one of the most underestimated cost drivers. If your app needs to work without signal and reconcile data later, budget extra.
- Auth and user roles — multiple account types (customer, staff, admin) multiply the testing and edge-case work.
MVP vs full build
An MVP isn't a cheap version of the final app — it's the smallest version that lets you validate the idea with real users before committing to the full build. That means picking one core workflow and cutting everything else, not building every feature at 80% quality. Most founders who skip the MVP stage end up paying twice: once for the full build, then again to fix the assumptions that turned out wrong. If budget is tight, an MVP scoped properly is almost always the better first move than a stripped-down full build.
iOS, Android, or cross-platform?
Unless you have a strong reason to go native (deep hardware access, AR, top-tier performance for something like gaming), cross-platform frameworks — React Native and Flutter are the mature choices in 2026 — will get you onto both iOS and Android from a single codebase, typically for 30–40% less than building native apps for each platform separately. Native still wins for apps that live or die on raw performance or need the very latest platform APIs on day one; for most business apps, cross-platform is the sensible default.
Ongoing costs people forget to budget for
The build is the beginning, not the end. Plan for:
- Hosting and backend infrastructure: from £50/month for something small to several hundred for anything with real traffic.
- App store fees: £79/year for Apple's developer programme, a one-off ~£20 for Google Play.
- Maintenance and updates: OS updates break things. Budget roughly 15–20% of the original build cost per year for bug fixes, security patches and compatibility work.
- Analytics and monitoring: crash reporting and usage analytics tools, usually £0–£200/month depending on scale.
If you're weighing up an app against a website or PWA, it's worth getting that scoping conversation right before any code gets written — at Web-ly we do this as a fixed-cost discovery phase so you get an honest number, not a guess, before committing to a build.