Custom web app development cost in London for 2026

The verdict in three sentences

In 2026, a custom web app MVP in London typically costs 25,000 to 60,000 EUR for 8 to 14 weeks of development, with a production-grade V1 rising to 60,000 to 150,000 EUR. Price is driven mostly by the team day rate (450-750 EUR for a developer, 600-900 EUR for a tech lead) and functional scope, not by a fixed package. A serious discovery phase before coding (3,000 to 8,000 EUR) remains the best lever to avoid a budget overrun of 30 to 50 %.

What each stage costs in 2026

The cost of a web app breaks down by phase. Here are 2026 ballpark figures seen on the London market for a B2B project run by an experienced team.

Discovery looks optional when you are in a hurry: it is precisely the step that protects the 60,000 EUR that follow. An MVP without clear specs almost always overruns.

Day rates, cloud and maintenance: the costs people forget

The purchase price is only the visible part. The annual run (hosting + maintenance) is 8 to 15 % of the build budget every year. Ignore that line and you end up with an app you can no longer evolve 18 months after delivery.

A 40,000 EUR MVP therefore implies a realistic run of 3,200 to 6,000 EUR/year excluding new features. Budget it from the investor pitch.

Mini case study

Thomas, founder of a PropTech in London, is preparing a seed round. He wants an MVP to validate a rental-management journey with 40 pilot clients. Scope: authentication, dashboard, document upload, notifications. Accepted quote: 42,000 EUR for an MVP delivered in 11 weeks (discovery 6,000 + build 36,000), with cloud at 280 EUR/month.

Adding maintenance at 10 %/year (4,200 EUR) and 3,360 EUR of annual cloud, his total first-year cost reaches 49,560 EUR. With this MVP he raises 600,000 EUR: development represents 8.3 % of the round, a ratio investors consider healthy for a product that already demos.

FAQ

What is the minimum budget for a real MVP in 2026? Count on at least 25,000 EUR. Below that you get a throwaway prototype, not a product able to handle the first 40 to 100 real users.

Fixed price or day-rate contract? Fixed price secures the cost but assumes frozen specs; day rate (450-750 EUR/day) offers flexibility. For an MVP a scoped fixed price is often preferable, with day rate taking over for iteration.

How long to deliver an MVP? Between 8 and 14 weeks with a team of 2 to 3 people. Projects promised in 4 weeks nearly always hide an unrealistic scope or immediate technical debt.

Can no-code replace custom development? To validate an idea cheaply, yes, from 5,000 to 15,000 EUR. But as soon as you target scalability, integrations and fundraising, custom development regains the edge.

Do you need a design system from the MVP? Not a full one, but reusable components (8,000 to 20,000 EUR) speed up the V1 by 20 to 30 %. A good compromise: lay the UI foundations from the MVP.

Let's scope your project. Tell us the key journey, your indicative budget (MVP 25-60k EUR or V1 60-150k EUR) and your funding timeline. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.