The verdict in three sentences
A credible B2B SaaS MVP in London costs between 50,000 and 110,000 GBP (about 58,000-128,000 EUR) in 2026, covering one core feature, secure auth and working billing. The realistic timeline is 10 to 14 weeks with a 2-3 person team at a day rate of 550-850 GBP. Never pay for a feature catalogue: pay to validate a market hypothesis as fast as possible.
What a 50-110K GBP MVP actually contains
An MVP is not a stripped-down version of your final product: it is the smallest system that proves customers will pay. In 2026 the non-negotiable base includes one core feature, secure auth (SSO is often required in B2B), recurring billing (Stripe), a minimal back office and CI/CD deployment. Everything else is an expensive distraction.
| MVP scope | Contents | 2026 cost (GBP) | Timeline |
|---|---|---|---|
| Core feature | 1 end-to-end business workflow | 22,000 - 42,000 | 4-6 wks |
| Auth + account management | Login, SSO, roles, invites | 7,000 - 15,000 | 1.5-2 wks |
| Recurring billing | Stripe, plans, trials, invoices | 6,000 - 12,000 | 1-2 wks |
| Admin back office | User management, support, metrics | 5,000 - 11,000 | 1-2 wks |
| UI design + light design system | Mockups + components | 6,000 - 17,000 | 2-3 wks |
| Infra + CI/CD + observability | Deployment, logs, alerts | 3,000 - 12,000 | 1 wk |
Above 110,000 GBP you are no longer building an MVP but a full v1: defer those ambitions until you have paying customers.
Day rate, run cost and post-launch roadmap
Cost does not stop at delivery. Once live, budget a monthly run cost of 400-1,800 GBP depending on traffic, plus ongoing maintenance to fix and evolve the product. Your true first-year budget is the build plus 6 months of rapid iteration.
| Post-launch item | 2026 estimate (GBP) | Frequency |
|---|---|---|
| Run infra (cloud, DB, monitoring) | 400 - 1,800 | monthly |
| Maintenance + fixes | 3,000 - 7,000 | monthly |
| Product iterations (2 sprints) | 10,000 - 22,000 | monthly |
| Tooling (analytics, email) | 200 - 700 | monthly |
| Security audit before scale | 7,000 - 18,000 | one-off |
UK day rates in 2026 sit between 550 and 850 GBP for a senior fullstack profile in an agency, slightly lower for a solo freelancer but with more continuity risk.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Mini case study
Thomas, founder of a B2B logistics startup in London, wants to validate a route-tracking tool. Scope: 1 core feature (scheduling), SSO auth, Stripe billing, back office. Quote: 78,000 GBP, delivered in 12 weeks. He targets 10 paying customers at 450 GBP/month, i.e. 4,500 GBP MRR by month 4. With a 900 GBP/month run cost and 5,000 GBP monthly maintenance, his operating break-even lands around 12 customers. The build amortises in about 15 months if growth holds. Without an MVP, he would have burned 180,000 GBP on a v1 before knowing whether the market exists.
FAQ
What is the minimum budget for a serious SaaS MVP in 2026? Below 50,000 GBP you get a throwaway prototype, not a billable product. The credible floor to launch with billing and security is 50,000 GBP.
How long until launch? Budget 10 to 14 weeks for a disciplined-scope MVP. Every feature added to the initial scope adds 1.5 to 3 weeks.
Do I need a full design system for the MVP? No. A light design system (reusable components) is enough, at 6,000-17,000 GBP. The full design system waits for your raise or first 30 customers.
What is the monthly cost after launch? Between 3,500 and 9,000 GBP/month all in (infra + maintenance + light iterations). Pure infra run stays under 1,800 GBP/month before you hit significant traffic.
Freelancer or agency for an MVP? An agency costs 10-20 % more but guarantees continuity, CI/CD and observability. For a funded MVP, continuity is worth the difference.
Let's scope your project. Describe your core feature, indicative budget (50-110K GBP) and target date, and we will scope the exact MVP perimeter. 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.
