How much does it cost to build an app in the UK? (2026 honest guide)

Building a custom mobile app in the UK typically costs £20,000 or more in 2026. A basic MVP (minimum viable product) usually lands between £20,000 and £60,000, a mid-sized app with several features between £60,000 and £150,000, and large, complex apps run well past that. Most UK developers charge day rates of £350 to £800. But there is a cheaper route most guides skip: apps built on proven, ready-made platforms rather than coded from scratch can start from around £995. Here is the honest picture.

Why bespoke apps cost so much

When a developer builds an app from scratch, you are paying for people's time — designers, developers, testers and project managers. A simple app might be 30 to 50 days of work. At £350 to £800 a day, the sums add up quickly, and that is before you count the parts most people forget.

An app is rarely just the thing on the phone. There is usually a back end (the server and database that stores your data), an admin dashboard so you can manage it, and two versions of the app itself if you want both iPhone and Android. Each of those is real work.

What actually drives the price

A few things move the number more than anything else:

• Features. Every screen, every button, every rule is time. A login, a payment, a map, a chat feature — each one adds days.
• Design. A polished, custom-drawn design costs more than a clean, sensible one built on tested patterns.
• Platforms. iPhone and Android are different systems. Building for both natively roughly doubles the work — which is why cross-platform tools exist.
• Back end and integrations. Connecting to payment providers, booking systems or other software adds cost.
• Testing and launch. Getting an app through Apple's and Google's review, and testing it on real devices, takes proper time.

The ongoing costs people forget

An app is not a one-off. Budget for hosting and servers, the £79/year Apple Developer account and £20 one-off Google Play fee, plus maintenance — phones and operating systems change constantly, and an app left untouched slowly breaks. Most agencies quote a monthly support figure on top of the build.

Why productised apps are so much cheaper

Here is the honest bit. Not every app needs to be invented from nothing. A loyalty app, for example, does broadly the same job for a coffee shop as it does for a barber. So instead of coding one from scratch every time, you can build on a proven, ready-to-brand platform and simply style it, load your details and launch.

That is exactly how Brightray keeps mobile apps affordable. Our ready-to-brand loyalty app is £995 to build plus £99/month for hosting and support (standard price £2,500), and mobile apps overall start from £995. You are not paying for 40 days of from-scratch coding — you are paying for a tested product, branded to you and launched quickly. The trade-off is simple: productised means faster and far cheaper, but shaped around a proven template; fully bespoke means anything you can imagine, at bespoke prices.

So what should you budget?

If you need something genuinely one-of-a-kind, budget £20,000 and up, and treat anything below £15,000 for a from-scratch app with healthy suspicion. If your idea fits a proven pattern — loyalty, bookings, a simple customer app — you may not need bespoke at all, and £995 to a few thousand pounds is realistic.

The most expensive mistake is paying bespoke prices for something a productised platform already does well. The second is under-budgeting a truly custom build and running out of money halfway.

Not sure which camp your idea falls into? Message Brightray on WhatsApp at 07977 785345 and we will tell you honestly — including if a cheaper route exists.