The verdict in three sentences
A custom MVP web app in London costs between EUR 25,000 and EUR 60,000 in 2026, for a single core feature, authentication, payment and a modern stack. The realistic timeline is 8 to 14 weeks depending on user-journey complexity. The line item that blows budgets is not the day rate but scope creep: every "just one more feature" adds around +50% to the initial budget.
What a EUR 25,000-60,000 MVP covers
An MVP is not a cheap version of the final product: it is the smallest version that validates a market hypothesis. Keep one core feature, cut everything else. The Next.js + Supabase stack (auth, PostgreSQL database, storage) ships fast without reinventing infrastructure, with Stripe payment wired in within days.
| MVP scope | Indicative 2026 cost (EUR) | Timeline | Milestones |
|---|---|---|---|
| Discovery + UX design | 4,000 - 8,000 | 1-2 wks | Approved mockups |
| Auth + roles + database | 5,000 - 10,000 | 1-2 wks | Working accounts |
| Core feature | 10,000 - 25,000 | 3-6 wks | End-to-end journey |
| Payment (Stripe) | 3,000 - 6,000 | 1 wk | First test charge |
| Deployment + QA | 3,000 - 8,000 | 1-2 wks | Production launch |
| MVP total | 25,000 - 60,000 | 8-14 wks | Paid beta |
Beyond EUR 60,000 you are no longer building an MVP but a v1 product: a different project with a different risk profile.
In-house, agency or offshore: the real comparison
The choice of builder matters as much as the scope. A senior in-house developer costs EUR 65,000-90,000/year fully loaded but takes months to hire. An agency bills by day rate and delivers a full team (product, design, dev). Offshore slashes the day rate but adds hidden management and quality costs.
| Option | 2026 day rate (EUR) | Time to start | Main risk |
|---|---|---|---|
| Senior freelancer | 450 - 700 | 4-8 wks (availability) | Bus factor, single brain |
| UK/EU agency | 500 - 700 | 1-2 wks | Higher cost |
| In-house team | 300 - 450 (loaded) | 3-6 months (hiring) | Time-to-market |
| Offshore | 150 - 300 | 2-4 wks | Management, quality, timezones |
For a first MVP the agency is the best speed/risk ratio: you buy a guaranteed timeline, not a hiring gamble.
Mini case study
Julien, founder of a B2B startup in London, wants to validate a site-progress tracker for tradespeople. Core feature: photo progress reports + client sign-off. Agency quote: EUR 42,000, 11 weeks. He resists adding invoicing and chat (pushed to v2), avoiding an estimated +EUR 21,000 overrun. With 30 beta clients at EUR 39/month he reaches EUR 1,170 MRR at launch and covers his cost in ~36 months — but more importantly he validates the market before raising funds. Real ROI: the demand proof that unlocks a funding round.
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FAQ
What does an MVP really cost in London in 2026?
Budget EUR 25,000 to 60,000 for a well-scoped core feature. Below EUR 25,000 the scope is usually unrealistic or the technical debt will be heavy.
How long does an MVP take?
Between 8 and 14 weeks with an agency. A quoted timeline under 6 weeks usually hides a disguised template, not true custom work.
Why Next.js and Supabase?
This stack saves 4 to 8 weeks of infrastructure (ready-made auth, database, storage) while staying scalable. You pay for the feature, not the plumbing.
How do I avoid scope creep?
By freezing a single core feature in the contract and pushing everything else into a separately quoted v2. That discipline protects your 50% of budget.
Can I charge from the MVP stage?
Yes: Stripe payment plugs in for EUR 3,000-6,000 in a week. A paid MVP is worth ten free ones for validating a market.
Let's scope your project. Tell us your core feature, indicative budget (25-60k) and target launch date, and we'll define the minimal viable scope. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
