SaaSMVPDevelopmentauth,billinganddashboardsdoneproperly
A SaaS MVP is a product someone can sign up for, pay for, and use without you in the room. That means the unglamorous parts have to work on day one: sign-up and email verification, password resets, plan selection, card capture, failed-payment handling, seat or usage limits, and an admin view so you can fix things yourself. Founders often underestimate how much of a SaaS build sits in that layer rather than in the headline feature.
My approach is to lock the billing model before design starts. Per-seat, per-usage, tiered or flat fee changes the data model, so it is far cheaper to decide it in week one than in month three. Then I build one core workflow end to end — the thing your customer is actually paying to do — and wrap it in accounts, permissions and analytics so you can see whether people come back.
Everything runs on React, TypeScript, Postgres and Stripe, with row-level security on the database so one customer can never see another's data. You own the repository from day one, and the stack is common enough that any competent developer or in-house hire can take it forward. Typical SaaS MVPs land between £25,000 and £60,000 over 8–14 weeks, depending on the product's scope and complexity.
Everything you need to launch
Which kind of SaaS are you building?
The core plumbing is shared, but each model changes the data design and the billing logic. Here's how I scope the three most common briefs.
B2B tool with teams
Organisations, invitations, seat-based billing and roles. Most common for internal-ops and agency tools. Usually £30,000–£55,000.
MVP serviceTwo-sided marketplace
Two user types, matching, messaging and payouts via Stripe Connect. Heavier than founders expect — typically £35,000–£80,000.
Custom web appsConsumer subscription
Self-serve sign-up, one clear paid feature, trials and referral hooks. Leanest of the three — often £20,000–£40,000.
MVP development UKHow it works
Scoping week
Billing model, data model, and a ruthless cut of the feature list to one testable hypothesis.
Design
Clickable prototype of sign-up, the core workflow and the admin view — signed off before code.
Build
6–10 weeks in two-week increments with a working demo link at the end of each.
Launch & iterate
Beta cohort, analytics review, then a prioritised backlog for version two.
Recent projects
Frequently asked questions
What does a SaaS MVP cost in the UK?+
Most SaaS MVPs land between £25,000 and £60,000. Consumer subscription products with one paid feature can start nearer £20,000; two-sided marketplaces with payouts usually run £35,000 to £80,000. You get a fixed price after a scoping week, not an hourly estimate.
How long does a SaaS MVP take?+
Typically 8 to 14 weeks from kick-off to a live product with paying users. The scoping week and design sign-off take the first two to three weeks; build runs 6 to 10 weeks depending on how many user roles and integrations are involved.
Do you handle Stripe subscriptions and VAT?+
Yes. Plans, trials, upgrades, cancellations, proration, failed-payment retries and invoices are all part of a standard build. For UK and EU VAT I usually wire in Stripe Tax so rates stay correct without manual work.
How do you keep customer data separated?+
Every tenant-scoped table gets row-level security policies at the database level, so isolation is enforced by the database rather than by application code that a future developer could accidentally bypass.
Can I hire developers to take it over later?+
That is the intention. The stack is React, TypeScript, Postgres and Stripe with no proprietary framework, and you own the GitHub repository, the schema and the design files from day one. I hand over documentation and a walkthrough recording at launch.
Will you build a mobile app too?+
For most SaaS MVPs a responsive web app is the right first step — one codebase, no app store review delays, instant updates. If your product genuinely needs native features such as push notifications or offline use, I scope that as a second phase.
What if I already have a designer or half-built product?+
Happy to pick either up. I audit what exists first and tell you honestly whether it is worth extending or faster to rebuild the parts that are blocking you.
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Read moreReady to scope your SaaS MVP?
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