What Does a Custom App Cost in the UK? Honest Ranges

If you have asked a few studios to price an app and the numbers came back very different, you are not alone. The honest answer to custom app cost is that it depends on what you are building, who builds it, and how much it needs to do after launch. At Summers Solutions we would rather walk you through the things that actually move the figure than hand over a single number that turns out to be wrong. This post sets out general ranges and the main cost drivers, so you can budget sensibly before anyone writes a line of code. These are software pricing notes, not finance advice.

How much does it cost to build a custom app in the UK?

There is no fixed price, but there are useful bands. As a rough guide for the UK market, custom app cost tends to fall into three broad groups by complexity:

• A simple single-platform app or a first version, an MVP, typically runs from around 10,000 to 30,000 pounds.
• A standard business app with user accounts, a few screens and a couple of integrations often sits from around 30,000 to 80,000 pounds.
• A more involved product with multiple user roles, advanced logic and several integrations can run from around 70,000 to 150,000 pounds or more.

Treat these as ranges to plan against, not quotes. The same idea can land in different bands depending on how much you want it to do and how polished it needs to be on day one. A good first conversation is about narrowing which band you are really in, then refining from there.

What is the difference in cost between an MVP and a full custom app?

An MVP, or minimum viable product, is the smallest version that still does something genuinely useful. The point is to get a working tool into real hands, learn from it, and only then invest in the rest.

A full custom app carries the cost of every role, every edge case and every nice-to-have feature, often before anyone has confirmed which features people actually use. That is where budgets tend to drift.

For most UK small businesses we suggest starting with the MVP band and treating later phases as separate decisions. You spend less to find out whether the idea works, and the money you do spend is better aimed. If the first version proves the case, you extend it. If it does not, you have lost far less than a full build would have cost.

Why do custom app quotes vary so much between UK studios?

Two studios can quote the same brief and arrive at very different totals. A few things explain most of the gap.

Scope and feature complexity is the biggest driver. A basic data-entry form might take only a few hours to build. Something like real-time scheduling, availability matching or a custom calculation can take from around 80 to 200 hours of developer time. The headline idea sounds similar in a meeting, but the work behind it is not.

Day rates set the baseline. UK studios commonly charge from around 350 to 800 pounds per day or more, usually as a blended team rate that covers senior, mid and junior developers plus testing and project management. Freelancers often sit lower, from around 250 to 500 pounds per day. London tends toward the top of these bands. Neither is automatically better value; it depends on the support and consistency you need.

Assumptions hidden in the quote. One studio may include design, testing and a launch period; another may quote build only. Always ask what is and is not in the figure, so you compare like with like.

If you want to see how we frame this kind of work, our page on custom apps explains the way we scope and phase a build.

How do integrations and platforms change custom app cost?

Two technical choices quietly shape a large part of the budget.

Integrations add cost per connection

Every external service you connect to, such as payment, messaging, mapping, email or a CRM, adds developer time, testing and an ongoing surface to maintain. Integrations often account for a meaningful slice of the build. A clean, well-documented service is quick to connect; a poorly documented one can cost far more to wire up reliably. Connecting third-party services into an app is rarely a flat fee, so it is worth listing every connection you expect early, rather than discovering them mid-build.

Platform choice changes the price materially

Where your app needs to run matters a great deal:

• A web app, which runs in the browser, is usually the cheapest route to reaching users and works across devices without app store steps.
• One native mobile platform, just iOS or just Android, is a reasonable baseline.
• Building both iOS and Android natively roughly doubles the effort, because it is close to two builds.
• Cross-platform frameworks such as React Native or Flutter sit in between and can cut cost compared with two separate native builds.

When you compare a web app against a native app, a web-first approach is often the most cost-effective starting point for a UK small business, with native added later if the use case truly needs it. We talk through these trade-offs in our systems and web work, since the right platform depends on how the app fits the rest of your operations.

How much should I budget for app maintenance each year?

Maintenance is not optional, and it continues well after launch. Software needs updates as phones, operating systems and the services it connects to keep changing. A figure often cited for annual maintenance is from around 15 to 25 percent of the original build cost per year, covering fixes, small improvements and keeping everything current.

On top of that, plan for running costs:

• Cloud hosting, which for a typical UK small-business web app often ranges from under 50 pounds to several hundred pounds a month, depending on traffic and data.
• Per-use fees for third-party services such as email, SMS, mapping or payment processing, which scale with how much you use them.

A simple rule: if you cannot fund the first year of maintenance, the build is not yet affordable. Budgeting for it from the start avoids an app that quietly stops working a year in because nobody planned to keep it alive.

Fixed price or time and materials, and should I pay for discovery?

The pricing model affects how predictable the project feels.

• A fixed-price quote suits a locked, well-understood scope. The studio absorbs the risk of overrun, so the figure usually includes a margin to cover that. You get certainty, but less room to change your mind.
• Time and materials bills the actual hours worked and flexes as the project evolves. It rewards a clear, collaborative client and suits work where some discovery is still happening.
• Many UK studios use a hybrid: a fixed budget per phase, such as discovery, design, build and launch, with flexible work inside each phase. We tend to favour this, because it gives you a known ceiling per stage without pretending every detail is settled on day one.

Before any firm estimate, a short paid discovery phase, often a few weeks, is a sensible first step. It produces a prioritised feature list, the main user journeys and a technical scoping document. That small upfront spend is the most reliable way we know to avoid the budget overruns that often hit software builds when the scope is vague. It also gives you a clear plan you could take elsewhere if you chose to.

A quick aside: nothing here is tax, accounting or legal guidance. For anything in those areas, check with a qualified accountant or solicitor.

Two Apple pages set the ground rules for any app that will reach the App Store: the Developer Program for membership and the App Store Review Guidelines for what gets accepted.

Custom app cost comes down to a handful of choices you can influence: how much the first version really needs to do, which platforms you target, how many services you connect, and how you fund the year after launch. Start small, scope honestly, and treat maintenance as part of the plan rather than a surprise. If you would like a grounded view of where your idea might sit, you can start a conversation with us, browse more notes on the blog, or look through our tools and wider solutions first.