"How much does an app cost?" is the most common question agencies hear — and the hardest to answer honestly without a conversation. The real range for UK mobile app development spans from tens of thousands to hundreds of thousands of pounds, and where your project lands depends on complexity, platforms, design ambition, and who's building it. This guide gives you the honest breakdown: what you'll actually pay, how pricing works, and where the money goes.
No agency can quote your project from a blog post — but after reading this, you'll know whether a quote is fair, what's missing from it, and how to keep costs under control.
Cost bands by app complexity
These are broad UK market ranges for professional design and build. Your scope will move you within them — treat them as planning brackets.
Simple apps: £20,000–£50,000
Content-driven apps, calculators, directories, simple booking or information apps — a handful of screens, standard UI components, minimal backend, no complex integrations. Think MVP for a straightforward concept. Design is clean but not bespoke-artistic; the backend is usually a simple CMS or API.
Mid-complexity apps: £50,000–£120,000
Custom user accounts, social features, in-app payments, real-time features (chat, notifications), integrations with third-party services, a proper admin panel. This is where most serious commercial apps live — fitness apps, marketplaces, booking platforms, food ordering. The backend becomes a real system, and testing effort grows substantially.
Complex apps: £120,000–£250,000+
Fintech, on-demand services with real-time logistics, apps with heavy custom AI/ML, IoT integration, video streaming, or multi-role platforms (customer app + provider app + admin). Complex business logic, stringent security requirements, and extensive testing. Timelines run 6–12 months with a full team.
For a deep dive on the most demanding category, our breakdown of fintech app development costs covers the compliance and security factors that push budgets up.
How agencies actually price
Understanding pricing models helps you compare quotes fairly — because a £60k fixed-price quote and a £60k time-and-materials estimate are very different commitments.
Fixed price
One price for a defined scope. Good for: well-specified projects where requirements are stable. Watch for: vague scopes that invite change-request charges, and agencies that pad the price heavily to cover uncertainty. Fixed price works when both sides invest in proper discovery first — our guide to fixed price versus time and materials compares them in detail.
Time and materials
You pay for actual time at agreed rates. Good for: evolving products, MVPs where learning changes the plan, long-term development. Watch for: scope creep without discipline, and rates that look fine weekly but accumulate alarmingly. Requires active product management on your side.
Dedicated team
A monthly fee for a team working on your product. Good for: ongoing product development over 6+ months. Often the best value for serious products — you get continuity, deep product knowledge, and no per-change negotiation. Watch for: committing before you've validated the concept.
Where the money goes: phase by phase
A typical mid-complexity app budget breaks down roughly like this:
- Discovery and UX design (15–20%). Research, user flows, wireframes, UI design, prototyping. Skipping this to save money is the most expensive decision in app development — it's where costly mistakes are cheapest to fix.
- Development (50–60%). Frontend, backend, integrations, admin tools. The largest share, and the one most affected by platform choice (see below).
- Testing and QA (10–15%). Functional testing, device testing, usability testing, beta programmes. Underfunded QA is how apps launch with one-star reviews.
- Launch and deployment (5%). App store submissions, metadata, screenshots, analytics setup, monitoring. Small in cost, critical in execution.
- Contingency (10%). Every project hits surprises. Budgets without contingency become stressful renegotiations.
The platform decision: the biggest cost lever
Building separately for iOS and Android roughly doubles design, build, and testing effort. Your options:
- Native (Swift + Kotlin). Best performance and platform integration; highest cost. Justified for performance-critical apps or deep hardware integration.
- Cross-platform (Flutter, React Native). One codebase, both platforms — typically 30–40% cheaper than dual native for most commercial apps, with quality users can't distinguish. The right choice for the majority of projects. Our Flutter versus native comparison helps you decide.
- One platform first. Launch iOS or Android based on where your users are, validate, then expand. Cuts initial cost nearly in half and focuses learning.
Costs beyond the build quote
The quote is the beginning of spending, not the end:
- Maintenance: budget 15–20% of build cost annually for OS updates, security patches, and small improvements. Apps that aren't maintained decay — then break.
- Backend and infrastructure: hosting, databases, and third-party services scale with users. Model these against growth projections.
- App store fees and services: developer accounts, plus the revenue share on in-app purchases and subscriptions.
- Ongoing development: successful apps keep evolving. Plan for a steady feature budget, not just launch spend.
How to spend wisely
MVP ruthlessly. Launch with the smallest version that delivers real value and validates the concept. Every feature you cut from v1 is money saved and learning accelerated. Invest in discovery. A few weeks of proper scoping routinely saves months of rework. Choose experience over cheap rates. The cheapest quote often becomes the most expensive project — rebuilds, delays, and abandoned codebases cost far more than senior rates. Plan for v2 before v1 ships. Knowing what's deliberately excluded keeps scope honest and gives the team a clear finish line. Compare quotes on equal terms. Look at what's included, how discovery is handled, and what ongoing costs apply — not just the headline number, because the cheapest quote is rarely the cheapest project once change requests are factored in.
Cost transparency is part of how we work: our custom mobile app development team scopes honestly, prices clearly, and tells you when your budget doesn't match your ambition — before you spend it, not after. Get a free consultation and we'll give you a realistic estimate for your specific idea.
FAQs
How much does it cost to build a mobile app in the UK?
Broad ranges: £20,000–£50,000 for simple apps, £50,000–£120,000 for mid-complexity apps with accounts, payments, and integrations, and £120,000–£250,000+ for complex apps like fintech or on-demand platforms. Add 15–20% of build cost annually for maintenance.
Is it cheaper to build with Flutter or native?
Cross-platform frameworks like Flutter are typically 30–40% cheaper than building separately for iOS and Android, with quality most users can't distinguish from native. Native is justified for performance-critical apps or deep hardware integration — a minority of projects.
What's the difference between fixed price and time and materials?
Fixed price sets one cost for a defined scope — good for well-specified projects, but vague scopes invite change-request charges. Time and materials bills actual time at agreed rates — better for evolving products, but needs disciplined product management to control creep.
How much does app maintenance cost per year?
Budget roughly 15–20% of the original build cost annually for OS compatibility updates, security patches, bug fixes, and minor improvements — plus infrastructure and third-party service fees that scale with users. Apps that skip maintenance decay and eventually break.
How can I reduce app development costs without sacrificing quality?
MVP ruthlessly (launch the smallest valuable version), start on one platform or use cross-platform, invest in proper discovery to avoid rework, and choose an experienced team — cheap quotes that lead to rebuilds are the most expensive option of all.
