How Much Does Mobile App Development Cost in the UK? (2026)

Short answer: In the UK in 2026, a custom mobile app from Talk Think Do falls within our published band of £25,000 to £100,000+, with projects running from 1 to 18 months. The price is set by feature count, platform choices, integrations, backend scope, and compliance requirements. AI-augmented delivery has moved prices down materially: our recent proposals land at 28 to 34% of what the same work would have cost before AI. Traditional agencies quoting on pre-AI day-rate maths are now pricing against a different market.

Every buyer asks the same first question: how much will the app cost? Most published answers are wide ranges with no reasoning behind them. This guide takes a different approach.

We explain what actually drives mobile app development cost, share our published pricing band, and show why AI-augmented delivery changes the arithmetic. If you are still building the business case, our post on the top benefits of enterprise mobile apps covers the value side of the equation.

What actually drives mobile app development cost?

Five drivers determine where any app lands in a pricing band. Understanding them lets you control the price before you request a single quote.

Feature count and complexity

Feature scope is the largest single driver. A focused internal tool with a handful of screens is a different project from a consumer app with accounts, payments, and push notifications.

Complexity matters as much as count. Offline-first behaviour, real-time updates, and payment flows each add architecture and testing work that a simple content app never needs.

Platforms and distribution

Building for both iOS and Android used to mean two codebases and close to double the cost. Cross-platform frameworks changed that. Our React Native development approach ships both platforms from one codebase, with native modules where a platform demands them.

Distribution adds its own work:

• Consumer apps go through App Store and Google Play review, metadata, and release management.
• Enterprise apps distribute through mobile device management (MDM) tooling such as Microsoft Intune or Apple Business Manager.
• Each route has its own configuration, review, and update overhead.

Integrations and backend

An app is a front end to systems behind it. Connecting to your customer relationship management (CRM) platform, payment provider, or legacy systems takes real engineering effort, and each integration adds scope.

Most apps also need a backend: an application programming interface (API), a database, authentication, and hosting. Whether we build that alongside the app or integrate with what you have is one of the biggest swings in any quote.

Compliance, security, and accessibility

Regulated and public-sector work costs more to do properly. Security standards, audit requirements, and accessibility obligations such as WCAG 2.2 AA all add design, build, and testing effort.

Retrofitting any of these costs far more than building them in. We build to the OWASP Mobile Application Security standard and support VoiceOver and TalkBack from the start, which is why these items appear in our scope rather than in a change request later.

How much does a mobile app cost in the UK in 2026?

Our published band for custom software development projects, which includes mobile apps, is £25,000 to £100,000+. Projects run from 1 to 18 months with teams of 5+ experts. The full breakdown is on our pricing page.

Where a project lands in that band follows the drivers above:

• The lower end suits a focused single-purpose app with a modest backend and standard integrations.
• The middle covers consumer apps with accounts, payments, push notifications, and store submission.
• The upper end, and beyond, covers multi-audience platforms with heavy integration, compliance, and offline requirements.

We publish the band because vague quotes waste everyone’s time. The honest answer to ‘how much?’ is always scope-dependent, but the band tells you whether we are the right kind of partner before the first call.

How does AI-augmented delivery change the price?

AI-augmented delivery has moved the economics of custom software, and the effect shows up directly in quotes. In Q2 2026, 91.6% of our code across live production work was AI-authored, with mobile apps at 88.6%. Delivery runs 40 to 50% faster than pre-AI baselines.

The headline commercial figure is starker. Our recent proposals for large, business-critical, greenfield cloud-native Azure builds are landing at 28 to 34% of what the same work would have cost before AI. That is a 66 to 72% saving against pre-AI cost. The full data and methodology are in our AI Velocity Report.

Two honest caveats apply to mobile specifically:

• Mobile is our lowest AI-authored category at 88.6%, because platform-specific behaviour still needs senior mobile engineers.
• The 28 to 34% figure was reported for large greenfield Azure builds, so mobile savings can be more modest.

The mechanism matters as much as the number. The saving comes largely from our accelerators and delivery harness, four years of encoded standards applied automatically, not from skipping engineers or quality processes. Every line is still reviewed by senior engineers within our ISO 27001 framework.

Why traditional day-rate quotes now look expensive

A traditional agency quote is day-rate arithmetic: people multiplied by days multiplied by a rate. That model assumes pre-AI productivity, where every line of code is typed by hand.

When a delivery team authors most code with AI and reviews rather than writes, the same scope needs fewer person-days. An agency still pricing on pre-AI throughput is not charging more for a better product. It is charging 2026 prices for 2022 productivity.

A worked example: a 10-week React Native app

The following is illustrative arithmetic, not market data or a quote. Every assumption is stated so you can rerun the sums with your own numbers.

Assume this scope:

• A customer-facing React Native app for iOS and Android from one codebase.
• A cloud backend with an API, authentication, and push notifications.
• App Store and Google Play submission included.

Assume traditional day-rate delivery: a 10-week build, a team averaging 3 full-time equivalents (a lead engineer, a second engineer, and part-time design, quality assurance, and project management adding up to one more), and an illustrative blended rate of £700 per person per day. At 5 working days per week, 10 weeks is 50 working days.

The traditional arithmetic: 3 people × 50 days × £700 = £105,000.

Now apply our published AI-augmented ratio to the same scope. At 28 to 34% of pre-AI cost, £105,000 × 0.28 = £29,400 and £105,000 × 0.34 = £35,700. That is roughly £29,000 to £36,000 for the same illustrative scope.

Mobile savings can be more modest than that ratio, as noted above. Even if the saving halved, the illustrative result sits comfortably inside our published £25,000 to £100,000+ band rather than above it. That is the practical effect of AI-augmented delivery: scope that once priced at the top of the band now prices in its lower half.

Which costs do buyers forget?

The build price is not the whole cost of owning an app. Three categories routinely get missed at budgeting time.

App store operations

Publishing is not a one-off event. Store listings need metadata, screenshots, and privacy declarations. Reviews can reject builds, operating system updates force maintenance releases, and store policies change. Someone has to own that work for as long as the app is live.

Post-launch support and maintenance

Live apps need monitoring, incident response, security patching, and over-the-air updates. We include 30 days of free post-launch support with every build. Beyond that, our managed support services start from £1,590 per month, covering monitoring, patching, and store version management. Full details are on our pricing page.

Backend running costs

The cloud infrastructure behind the app bills monthly for as long as the app runs. Hosting, databases, push notification delivery, and monitoring all consume cloud spend that scales with usage. A well-architected backend keeps this predictable, which is one reason mobile app backends deserve as much design attention as the app itself.

How should you compare quotes from UK app developers?

Compare the delivery model, not just the bottom line. Two quotes for the same scope can differ by a factor of two or more simply because one team prices on pre-AI day-rate productivity and the other has industrialised AI-augmented delivery.

Ask every shortlisted developer these questions:

• What proportion of your production code is AI-authored, and how do you measure it?
• How does AI change your price and timeline for this scope, specifically?
• What quality process reviews AI-authored code before it ships?
• What do post-launch support and store operations cost, and who does the work?
• Do we own the source code outright at the end?

Price is only one part of the selection decision. Our companion guide on choosing mobile app developers in the UK covers the full evaluation, from technical due diligence to contract terms.

If you want a real number for your scope rather than a band, book a free consultation. We can give you a realistic indication of cost and timeline in the first conversation, and our mobile app development service page sets out exactly how we deliver.