How long does it take to build an app? The 2026 UK timeline

How long does it take to build an app in 2026? Prototype 5–10 days, MVP 6–8 weeks, production 3–6 months. Stages, app types, delays and fixes.

The short answer: building an app takes 5–10 working days for a coded prototype, 2 weeks for Discovery, typically 6–8 weeks for a startup MVP and 3–6 months for a full production mobile or web project. Enterprise and regulated products take longer. These are Magora's published timelines for UK projects in 2026, not guarantees. The biggest single factor is not the code: it is how clearly the scope is defined before development starts, and how quickly decisions, integrations and approvals arrive.

Below you will find the timeline at a glance, the seven stages of the app development lifecycle with what happens and how long each takes, timelines by type of app, what slows projects down and how to go faster. The timings come from how we run projects at Magora, a London software development company that has shipped 250+ products since 2010.

How long does it take to build an app? At a glance

For a detailed breakdown of prices, see our UK app development cost guide, or try the free app cost calculator.

The app development lifecycle at a glance

Stage 1: Idea and validation

Every successful app starts with a narrow problem, not a feature list. Write down who the user is, what they do today instead of using your app, and the single outcome that would prove the app is working — sign-ups that convert, bookings completed, hours saved. Talk to five to ten potential users before anyone designs a screen. This stage costs almost nothing and removes the most expensive mistake in app development: building something people do not need.

Stage 2: Prototype

A prototype answers "do people understand it and want it?" in days rather than months. At Magora we build a free working prototype of your core flow in 5–10 working days, before any paid engagement, so you can put something real in front of users and investors. A prototype is not an MVP: it proves the idea and the flow, not the production system.

Stage 3: Discovery

The discovery phase turns a promising idea into a plan you can fund. Over about two weeks a senior product owner and solution architect define user roles, prioritise features into "must have now" and "later", choose the architecture and integrations, and produce an estimate and a timeline. Discovery at Magora starts from £3,000 and ends in a fixed-price quote for the build. It is also the stage that protects your timeline: projects that skip it tend to discover the same questions in the middle of development, when answering them costs far more.

Stage 4: UX and UI design

Designers turn the prioritised scope into user flows, wireframes and a visual design, then test them with a handful of target users before production code is written. For an MVP this takes one to two weeks because only the MVP scope is designed; for a larger product, two to three weeks for the first release. The output is a tested design and a UI kit developers build from.

Stage 5: Development

Development runs in short sprints — usually two weeks — with a demo of working software every week and the code in a repository you own. A typical startup MVP needs 4–6 weeks of build; a full production app 6–14 weeks or more depending on platforms and integrations. Backend, mobile and web work in parallel. Continuous integration and feature flags let the team release safely and often rather than in one risky "big bang".

Choices made here have the biggest effect on timeline: native versus cross-platform (React Native or Flutter), how many third-party integrations there are (payments, maps, CRMs, NHS or banking APIs), and whether you need AI features — see AI agent development for how we scope those.

Stage 6: Testing and launch

Quality assurance runs throughout development, then a final round of automated tests, manual exploratory testing and load testing happens on a staging environment. Launch covers App Store and Google Play submission, production hosting, monitoring and alerts switched on before the first real user arrives. Allow one to two weeks. Store review is usually short but not zero, so plan the launch date with a buffer; the facts are in what slows an app project down below.

Stage 7: Post-launch iteration

Launch is the start of the product, not the end of the project. Analytics on every key step shows where users drop off; weekly or fortnightly releases fix issues and add the features that were deliberately left out of version one. Most teams move to a maintenance retainer or support plan covering fixes, SLAs and ongoing development. Magora support starts from £1,000 a month and scales with the scope of the project.

Who is involved at each stage

Knowing who does what helps you plan your own time as well as the agency's:

• Idea and validation: you, with a few target users; an experienced product person helps you narrow the scope.
• Prototype: a senior developer or designer-developer pair building the core flow.
• Discovery: a senior product owner and a solution architect, with you as the decision-maker, plus short input from your users or operations team.
• Design: a UX/UI designer, reviewed by you and tested with target users.
• Development: mobile, backend and web engineers, a QA engineer and the product owner, with a weekly demo to you.
• Launch and after: the same team plus DevOps for hosting, monitoring and releases.

Your biggest time commitment is in discovery and at the weekly demos. Plan for a few hours a week from one person who can make decisions; projects move fastest when answers come in days, not weeks.

Native or cross-platform: the effect on your timeline

Building separate native iOS (Swift) and Android (Kotlin) apps means two codebases, so the mobile part of development takes longer and costs more. Cross-platform frameworks such as React Native and Flutter share most of the code between platforms and usually shorten the first release; they are the right default for most business apps. Native is worth the extra time when the app depends heavily on device hardware, complex animation or maximum performance. A web app or progressive web app can be faster still for internal tools and B2B products that do not need to live in the app stores.

How long does each type of app take?

Scope, not platform, drives duration. These are Magora's typical timelines by type of product, built from the same bands that sit behind our pricing pages. They are not quotes.

The right-hand column matters more than the left: a "simple" app with a hard integration is slower than a "complex" one with none. If you are choosing between the two routes, our MVP development page shows what fits in 6–8 weeks.

What slows an app project down?

• Unclear scope — features added mid-build are the most common cause of delay. It is healthy when a new idea is traded against something else, and expensive when it is simply added.
• Integrations. Payments, identity checks, CRMs and partner APIs depend on someone else's sandbox, documentation and approval. Ask for access on day one; one hard integration can add more time than ten screens.
• Approvals and late decisions on your side. Weekly demos only help if someone with authority attends and decides. Legal, security or procurement sign-off belongs in the plan, not after it.
• Content. Copy, product data, images, terms and privacy policy arrive late more often than any feature.
• App store review. Apple says App Review typically reviews at least 50% of submissions in less than 24 hours and 90% in less than 48 hours, and that incomplete submissions may be delayed. Google says Play review can take up to seven days or longer in exceptional cases, and personal Google Play developer accounts registered after 13 November 2023 need a closed test with at least 12 testers for 14 days before production access. Enrol in both programmes early; see the Apple developer fee guide.
• Regulated domains without compliance planned from the start.
• Building everything at once instead of shipping an MVP and learning from real users.

UK-specific steps to plan for

• UK GDPR: a data protection impact assessment for apps handling personal or sensitive data, plus privacy notices and consent flows.
• Health apps: NHS DTAC evidence, a DCB0129 clinical safety case and, where the app may be a medical device, an early decision on intended purpose — see healthcare software development.
• Fintech apps: FCA-aligned controls, KYC and AML checks and Open Banking integrations add time to discovery and testing.
• Data residency: decide early whether data must stay in the UK or EU; it affects hosting and third-party AI services.

How to build an app faster

• Start with a free prototype (5–10 days) and a two-week Discovery sprint, and freeze the MVP scope before build.
• Cut version one to one or two core journeys. Everything deliberately left out can ship in the weekly releases after launch.
• Name one decision-maker on your side who attends weekly demos and answers within days.
• Line up API access, sandbox accounts, copy and branding assets in week one.
• Keep a "later" list for new ideas instead of adding them to the current sprint.
• Pick one platform first, or a cross-platform build, unless the product needs native iOS and Android separately.
• Ship the MVP, measure, then plan version two from real usage.
• If you need more capacity rather than a whole agency, add a dedicated development team to your own.

Faster is possible, but not free: squeezing a 16-week plan into 10 weeks typically adds around 30% to the cost because of overtime and the overhead of running more work in parallel. Cutting scope is the cheaper way to ship sooner.

Magora builds mobile apps, SaaS platforms and AI products for UK companies: 16 years in business, 250+ products delivered, 97% on time and 75+ verified reviews on Clutch. Every project starts with an NDA and a free working prototype.

Frequently asked questions

How long does it take to build an app?

At Magora a coded prototype takes 5–10 working days, a Discovery sprint 2 weeks, a startup MVP typically 6–8 weeks of build (two to three months from the first call to live users) and a full production mobile or web app 3–6 months. Regulated or integration-heavy products run 5–8 months and bespoke enterprise platforms 6–12 months. These are published timelines, not guarantees.

What are the stages of app development?

Seven stages: idea and validation, prototype, discovery, UX and UI design, development in sprints, testing and launch, and post-launch iteration.

What is the difference between a prototype and an MVP?

A prototype proves the idea and the core flow in days, so people can see and click it. An MVP is a production-grade first version with real users, hosting, authentication and analytics, built to be extended rather than thrown away.

How long is the discovery phase?

Usually two weeks, and up to four for complex or regulated products. At Magora discovery starts from £3,000 and ends in a costed roadmap and a fixed-price quote.

Can an app be built in a month?

A working prototype can: five to ten working days. A production-quality MVP with real users, payments or integrations cannot reliably be built in four weeks. Cutting scope is the way to ship sooner; compressing a fixed scope into a shorter schedule typically adds around 30% to the cost.

How long does app store review take?

Apple says App Review typically reviews at least 50% of submissions in less than 24 hours and 90% in less than 48 hours; incomplete submissions may be delayed. Google says Play reviews can take up to seven days or longer in exceptional cases, and personal developer accounts registered after 13 November 2023 must run a closed test with at least 12 testers for 14 days first.

What slows an app project down most?

Unclear scope, late decisions, third-party integrations that are not ready, content that arrives after the screens are built and slow approvals on the client side. App store review is rarely the bottleneck; waiting for answers usually is.

What happens after an app is launched?

Teams monitor analytics and stability, fix issues and release improvements every week or two. Most products continue on a maintenance retainer or support plan; Magora support starts from £1,000 a month and scales with the scope of the project.

Last checked: 13 October 2026. Sources: Magora published timelines and prices (pricing.md, homepage FAQ). Apple: App Review, Apple Developer. Google: Prepare your app for review and App testing requirements for new personal developer accounts, Play Console Help. All checked 13 October 2026.