You have an app idea and a sensible next question: what will it cost? The honest answer is that 'a mobile app' covers everything from a £15,000 booking tool to a £250,000 marketplace, so any single figure is meaningless without scope. What you can do is understand the bands, what pushes you up or down within them, and how to brief a project so the quotes you get back are comparable.
This guide gives you realistic 2026 UK ranges and explains where the money actually goes — so you can budget with confidence and spot a quote that is too good to be true.
Realistic UK price ranges in 2026
These are typical figures for a custom app built by a UK-based agency or strong freelance team. Offshore teams can be cheaper, but factor in the management overhead and risk we cover later.
| App type | Typical UK cost | Build time |
|---|---|---|
| Simple MVP (1 platform, core features) | £20,000 – £45,000 | 2 – 4 months |
| Standard app (both platforms, accounts, payments) | £45,000 – £90,000 | 4 – 7 months |
| Complex app (marketplace, real-time, integrations) | £90,000 – £200,000+ | 7 – 14 months |
If a quote sits far below these bands, ask what is being cut: custom design, testing, a proper backend, or whether you are buying a templated app dressed up as bespoke.
What actually drives the cost
Features and scope
Every screen, every rule, every 'wouldn't it be nice if' adds hours. User accounts, in-app payments, push notifications, chat, maps, offline mode and admin dashboards each carry real cost. The single biggest budget lever you control is deciding what genuinely belongs in version one.
One platform or two
Building separate native apps for iOS and Android roughly doubles development. Cross-platform frameworks share most of the code and typically save 30-40%. For most UK businesses, cross-platform is the sensible default unless you have heavy performance or hardware needs.
Design
A polished, on-brand interface with custom illustration and smooth animation costs more than a clean, standard layout. Good design earns its keep in retention, but it is a dial you can turn up later.
The backend
Much of an app's cost is invisible: the server, database, APIs and admin tools behind the screens. A simple app may need almost none; a marketplace with live data needs a lot. This is where underquoting hides.
Who builds it
A solo freelancer is cheaper but a single point of failure. A UK agency costs more but brings designers, developers, testers and project management. Offshore teams advertise low day rates, but time zones, communication and rework can erode the saving.
The costs people forget
The build is only the start. Budget for these too:
- App Store accounts: Apple charges $99/year, Google a one-off $25.
- Hosting and infrastructure: often £50–£500+ per month, scaling with users.
- Maintenance: plan for 15–20% of the build cost per year for updates, OS changes and fixes.
- Third-party services: payment processing, mapping, SMS and analytics often carry usage fees.
An app is a living product, not a one-off purchase. We cover the ongoing side in detail in our guide to app maintenance costs after launch.
How to spend less without cutting corners
You do not have to compromise on quality to control the budget. The smartest savings come from discipline, not penny-pinching:
- Ruthlessly prioritise. Launch with the features that prove the idea, then add the rest based on real user feedback.
- Go cross-platform. Unless you genuinely need native performance, one shared codebase serves both stores.
- Write a tight brief. Vague briefs invite padded quotes. A clear scope lets agencies price accurately and lets you compare like with like.
- Get three comparable quotes. Pricing varies wildly, so always benchmark against multiple credible teams.
Getting accurate quotes
The fastest way to a reliable number is to brief several vetted teams on the same scope and compare what comes back. Browse UK app development agencies in our directory, shortlist three whose past work matches your sector, and ask each for a staged, milestone-based proposal. If a developer has already claimed their profile, you can review their portfolio and verified details before you ever pick up the phone. Comparing real quotes against a fixed brief is the single best way to know what your app should cost — and to avoid both overpaying and underbuilding.