How much does it cost to build a mobile app in the UK?

What drives the cost

• Accounts, roles and permissions.
• Payments, subscriptions or anything regulated.
• Integrations with systems you do not control.
• Offline behaviour and syncing, which is far harder than it sounds.
• Bespoke design versus adapting a design system.
• Whether it ships on one platform or two.

The costs after launch

Budget for hosting, store developer accounts, operating-system updates twice a year, bug fixes and support. An app left untouched for two years usually needs work before it will pass review again.

How to keep version one affordable

Agree the single job the app must do, and let the rest wait. Ship to a small group of real users, watch what they ignore, and spend the next budget on what they actually used.

What actually makes up the price

An app is more than the screens people see. Most of the cost sits in design, the back-end that stores data and handles accounts, integrations with payment or booking systems, an admin panel for your team, testing across devices and preparing store listings.

The biggest single driver is scope. Every extra user type, integration or custom feature adds design, build and testing time.

• Discovery and UX design.
• App build for iOS and Android.
• Back-end, database and admin tools.
• Third-party integrations.
• Testing, launch and store submission.

Indicative UK price bands

As a broad guide, a simple app with a handful of screens and basic accounts often starts in the low tens of thousands of pounds. Apps with payments, bookings, real-time features and an admin dashboard commonly sit in the mid tens of thousands. Complex marketplaces or platforms with several user types and integrations can cost considerably more.

Cross-platform frameworks such as Flutter can reduce cost by sharing one codebase across iOS and Android, without a noticeable difference for most business apps.

Keeping cost under control

Launch a focused first version that solves the core problem well, then use real feedback to decide what comes next. Agree priorities in writing, review progress every week or two on real devices and keep a list of 'later' ideas instead of adding everything now.

Remember annual running costs: hosting, developer accounts, monitoring, updates for new operating systems and small improvements. A common rule of thumb is to budget a meaningful percentage of the build cost each year.