B2B SaaS MVP Cost in London (2026)

The verdict in three sentences

A B2B SaaS MVP is not a "small" version of the final product: it is a single core feature wrapped in the bare minimum (auth, billing, dashboard) to prove traction before a raise. In London in 2026, budget GBP 28,000 to 65,000 and 10 to 16 weeks with a Next.js + Supabase + Stripe stack. Every feature added to the MVP delays time-to-market and burns runway: scope discipline is the real valuation lever.

What an MVP SaaS actually covers

The founder's trap is to ship a V1 under the MVP name. The MVP answers one question: "will customers pay for this feature?". Anything that doesn't serve that demonstration is deferred.

The fastest 2026 stack to ship a B2B MVP: Next.js (front + API routes), Supabase (Postgres + auth), Stripe Billing (subscriptions), Vercel deployment. It avoids rebuilding infrastructure and concentrates budget on the core feature.

MVP vs V1 scope: the decision table

Runway rule: an MVP at GBP 47,000 represents roughly 3 to 4 months of burn for a young team. If your pre-seed is GBP 280,000, that leaves plenty to iterate before Series A.

Mini case study

Lea, founder of an HR startup in London, wants to raise a pre-seed. Her MVP: a single module to track annual reviews, with auth, Stripe billing at GBP 45/month per company and an HR dashboard. Scope estimated at 62 person-days, average day rate GBP 590, i.e. GBP 36,580 delivered in 13 weeks. She signs 12 pilot customers at GBP 45/month: GBP 540 MRR in 2 months, traction that justifies a raise. The MVP represents under 13 % of her GBP 280,000 pre-seed envelope.

FAQ

What does a B2B SaaS MVP really cost in 2026? Between GBP 28,000 and 65,000 in London. Below GBP 28,000 you fund a non-billable prototype; above GBP 65,000 you are already building a disguised V1.

How long to deliver? 10 to 16 weeks with a team of 2 to 3 profiles on a Next.js + Supabase stack. Going under 10 weeks means cutting scope further, not adding people.

Why limit to a single core feature? Because the MVP must prove willingness to pay. Each extra feature adds 5 to 35 person-days and pushes back the first Stripe invoice, i.e. the data investors care about.

Should Stripe be integrated from the MVP? Yes: without billing you have no MRR, so no proof of traction. Stripe Billing integration costs 6 to 10 person-days, a worthwhile investment from the first paying customer.

Is the MVP disposable? No, if the stack is well chosen. A clean Next.js + Supabase base serves as the foundation for V1; you carry over 60 to 80 % of the code instead of rewriting.

Let's scope your project. Tell us the core feature to validate, your pre-seed envelope and target raise date, and we will frame an MVP priced by person-day, deliverable in under 16 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.