Most businesses asking us about mobile app development costs receive wildly different answers depending on who they speak to. Some agencies quote £20k. Others quote £500k. Neither figure is wrong — but without context, neither is useful.

Here is what actually drives the number, based on the projects we have built at Stakk. As an app development agency in London, we see this confusion daily.

app development agency London


By the end of this, you will know the accurate cost ranges for different app types, what drives prices up, and the key questions to ask any agency before you sign a contract.


1. What Type of App Are You Building?

QUICK ANSWER   The type of app is the single biggest cost driver. Each sector has a standard feature set — once you know which you are building, a good agency can estimate 60–70% of the scope before you have written a brief.

This is the first question we ask every client who comes to us for a mobile app development quote, and it is the most revealing. Different categories of app share predictable feature sets, which means experienced agencies can sense-check scope quickly.

For example, when we scope an ecommerce or marketplace app at Stakk, we know five core modules will almost certainly be required: user accounts and sign-up, product listings and a basket, payment gateway integration, order management, and push notifications. The client may not have listed all five in their brief — but they will need all five.

Common app categories we build and their typical feature sets:

  • Ecommerce / marketplace — accounts, listings, basket, payment gateway, order tracking
  • Fitness and wellness — sign-up, content library, community features, subscription billing
  • B2B SaaS / internal tools — dashboards, permissions, data integrations, reporting
  • IoT and hardware-connected apps — device pairing, real-time data feeds, background services

Knowing your category helps any agency give you a more accurate baseline — and helps you spot quotes that are missing obvious features.


2. Feature Complexity: MVP vs Full Build

QUICK ANSWER   An MVP (Minimum Viable Product) includes only the features needed to validate the idea. Scoping to MVP level is the most effective way to control mobile app development costs without compromising the product.

Once you know your app type, the second driver is complexity. The same feature can be built at three very different price points depending on how deeply it needs to work.

Take user accounts. A basic email-and-password sign-up might take two to three days to build. Add social login (Google, Apple, Facebook), two-factor authentication, and granular permission roles, and you are looking at two to three weeks. Same feature — very different scope.

The key discipline for any MVP is ruthlessness about what is genuinely required now versus what you want eventually. Every feature you include in the first build adds cost, time, and maintenance overhead. Features you defer cost nothing until you need them.

A useful test: ask yourself whether the app fails without this feature. If the answer is no, move it to Phase 2.


3. Where Are the Developers Based?

QUICK ANSWER   Developer location is one of the most significant cost variables in mobile app development. A 100% UK-based team typically charges between £100k and £250k for an MVP. Offshore or nearshore teams can reduce this — but come with trade-offs.

Day rates vary substantially by location. UK-based senior developers typically charge £500–£800 per day. Eastern European teams range from £200–£400 per day. South Asian and South-East Asian teams are lower still.

The maths is straightforward: a 12-week MVP at five developers is roughly 300 developer-days. At UK rates, that is £150k–£240k. At Eastern European rates, £60k–£120k.

What the maths does not capture is communication overhead, timezone friction, and the risk of misaligned expectations. For straightforward, well-documented builds, offshore teams can deliver excellent results. For complex, evolving briefs — especially in regulated industries like fintech or healthcare — a closer team often pays for itself in reduced rework.

At Stakk, we are UK-based. We do not claim that is right for every project, but we are transparent about what it means for your budget.


4. A Real Example: What £47,500 Gets You

QUICK ANSWER   A fitness app built by Stakk — including sign-up, account management, a home page, content library, community tab, and payment gateway — came in at £47,500 + VAT as a tightly scoped MVP.

We built a fitness platform for a UK-based client with the following scope: user registration and account management, a home screen with personalised content, a content library (video and text), a community tab, and Stripe payment gateway integration for subscription billing.

The total cost was £47,500 + VAT. That is not cheap — but it reflects a properly built, scalable MVP using a senior team, not a race-to-the-bottom build that would need replacing in 18 months.

For the technology stack, we chose React Native for the front end. React Native allows a single codebase to run on both iOS and Android, which kept build time — and therefore cost — down significantly. We paired it with a Node.js backend, which suited the app’s lightweight data requirements and kept infrastructure costs manageable.

Had this been an ecommerce or IoT project — one requiring background services, complex microservices, or heavy data processing — we would likely have recommended Flutter with a Python backend instead. The right stack depends on the problem, not on preference.

see how we built this fitness app

The Stakk Take

At Stakk, we itemise every quote line by line — not because it is good admin, but because it is the only honest way to scope mobile app development.

During our discovery phase, we run structured workshops that go deep into the functionality of each feature. We do not quote ‘a payment gateway’ — we quote the specific payment gateway your users need, the edge cases it has to handle, and the integrations it needs to support. That level of detail means that by the time you receive the quote, there are no surprises on either side.

Clients can remove or add features before a single line of code is written. You know exactly what you are paying for. That is how app development quotes should work.

What to Avoid When Getting a Mobile App Development Quote

These are the mistakes we see most often from businesses entering the app development process for the first time.

  • Accepting a non-itemised quote. If the quote is a single number with a brief description, ask for a feature-by-feature breakdown. We have had clients come to us with a £30k quote that did not include a payment gateway or user authentication — two of the most fundamental features in most apps.
  • Only speaking to one supplier. The standard rule of thumb is to obtain detailed quotes from three to four leading agencies. Comparing them will reveal assumptions you did not know had been made.
  • Not asking the agency to walk through the quote. A walkthrough forces clarity — you will quickly identify whether the agency truly understands your brief or has made assumptions to fill gaps.
  • Building on no-code or AI-generated platforms for a production app. These tools are excellent for prototyping and internal tools, but most are not ready for a consumer-grade, scalable mobile app. The rebuild cost almost always exceeds the saving.
  • Treating the quote as fixed before discovery. A good agency will not give you a final price until they fully understand the brief. Quotes issued before discovery are estimates — treat them as such.

Frequently Asked Questions

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

It depends heavily on scope and team location. A tightly scoped MVP built by a UK-based team typically falls between £40k and £120k. More complex builds with extensive integrations or custom back-end infrastructure can reach £200k–£300k. The only reliable way to get an accurate number is a detailed, itemised quote after a proper discovery session.

What is the most important thing to include in an app development brief?

Feature detail. The more precisely you describe what each feature needs to do — not just what it is — the more accurate your quote will be. For each feature, describe the user journey, any integrations it requires, and what ‘done’ looks like. Vague briefs produce vague quotes.

How do I know if a mobile app development quote is fair?

Compare it against two to three other itemised quotes from agencies of similar quality. Look at what is and is not included, not just the total figure. If a quote seems significantly lower than others, ask specifically what has been excluded — a missing payment gateway or authentication module is a common source of underquoting.

What questions should I ask an app development agency before signing?

Ask to see the itemised quote and walk through it together. Ask which technology stack they recommend and why. Ask how they handle scope changes. Ask for a named contact throughout the project. Ask to speak to a previous client. A reputable agency will welcome all of these.

What is the difference between an MVP and a full app build?

An MVP (Minimum Viable Product) includes only the features required to launch and validate the product with real users. A full build includes the entire feature set. For most early-stage projects, an MVP is the right starting point — it reduces upfront cost, accelerates time to market, and ensures you are building features users actually want before investing further.

Summary

Getting an accurate mobile app development quote comes down to three things: knowing your app type, being specific about features, and understanding where your developers are based. A quote that cannot be itemised is a quote that cannot be trusted. Ask for the breakdown, walk through it with the agency, and speak to at least three suppliers before you decide. The more thorough you are at this stage, the fewer surprises you will encounter once the build begins.


Written by Girish Alwani, Project Director at Stakk. Bringing over a decade of experience in product strategy, project delivery, and client relations across web and mobile development. He has overseen 120+ projects spanning healthcare, EdTech, e-commerce, and enterprise platforms, working with clients ranging from early-stage startups to established brands including LNER Trains, The British Museum, and Nivoda. Known for his hands-on communication style, Girish serves as the primary point of contact for many of Stakk’s key engagements, ensuring projects are delivered on time and aligned with client goals.

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