SaaS development cost is one of the most opaque topics in the startup world. Agencies quote wildly different numbers for the same brief. Freelancers underquote and overrun. Founders get surprised by invoices that are double the estimate. This guide cuts through that. Here are honest numbers, what drives them, and how to get the most from your development budget.
The Short Answer: What Does an MVP Cost?
A production SaaS MVP — user authentication, core feature, responsive UI, deployed on a real domain, with full code ownership — costs between £7,500 and £25,000 from a UK SaaS development studio in 2025. The range depends on scope complexity. A simple two-sided marketplace MVP sits at the lower end. A multi-tenant compliance SaaS with Stripe billing, email onboarding, and an admin panel sits at the higher end. At Two Bit Digital, our Build package starts at £7,500 for a 10-day production MVP.
The Four Cost Brackets for SaaS Development
- •£500–£3,000: No-code / low-code tools (Bubble, Glide). Fast and cheap. Not suitable for serious products — performance limits, high transaction fees, and you do not own the code.
- •£3,000–£12,000: Fixed-price MVP studio (like Two Bit Digital). Production code, real stack, you own everything. Best value for MVP stage.
- •£15,000–£60,000: Traditional UK agency MVP. Slower, more process, often includes discovery phases and design sprints. Appropriate for more complex products.
- •£60,000+: In-house team (salary + recruitment). High fixed cost, slow to start, appropriate when you have product-market fit and need to build a long-term engineering function.
What Drives the Cost of SaaS Development?
- •Scope — the number of distinct user flows and features is the primary cost driver. Every additional flow adds days.
- •Authentication complexity — basic email login is fast. OAuth (Google, GitHub) + magic links + role-based access adds time.
- •Payment integration — adding Stripe with subscriptions, webhooks, and billing portal adds 2–4 days to a build.
- •Third-party API integrations — each external API adds integration time and error-handling complexity.
- •Multi-tenancy — building for multiple isolated organisations (separate workspaces, RLS, org management) is more complex than a single-user product.
- •Admin functionality — organiser dashboards, operator panels, and internal tooling each add scope.
- •Mobile app — a React Native mobile app in addition to the web app roughly doubles the build time.
Freelancer vs Agency vs MVP Studio: A Cost Comparison
A UK-based senior freelance developer charges £500–£800 per day. A 10-day MVP would cost £5,000–£8,000 in developer time — but this is rarely achievable, because a freelancer typically needs 4–8 weeks to deliver the same scope due to context switching between clients. A traditional UK agency might charge £15,000–£40,000 for the same MVP, with a timeline of 8–16 weeks. A fixed-price MVP studio delivers the same production-quality output for £7,500–£12,500 in 10 working days — because the scope is locked, the stack is standardised, and there is no scope creep.
Hidden Costs Founders Do Not Anticipate
- •Scope creep — mid-build feature additions are the number one cause of budget overruns. Lock scope before you start.
- •Infrastructure costs — Vercel, Supabase, and domain registration are minimal at MVP stage (often under £50/month), but plan for them.
- •Post-launch engineering — your MVP will need iteration. Budget for a post-launch engineering retainer or a second sprint.
- •Design revisions — if you supply designs that change mid-build, expect additional cost.
- •Third-party API fees — OpenAI, Stripe, Resend, and others charge per use. Understand your expected usage before launch.
- •Legal — privacy policy, terms of service, and cookie consent. Use a template service rather than a solicitor at MVP stage.
How to Get the Best Value From Your Development Budget
- •Define scope before you get quotes — a vague brief produces a vague (and therefore inaccurate) estimate.
- •Prioritise ruthlessly — build one user flow, not five. You can add v2 features once you have validated v1.
- •Choose a fixed-price engagement — hourly billing incentivises slow work and creates budget anxiety.
- •Verify you will own the code — some agencies retain IP or require you to use their hosting. Insist on full ownership.
- •Ask for references — talk to previous clients about whether the project shipped on time and on budget.
- •Plan for iteration — budget is not just for the MVP. Budget for the first two post-launch sprints.
Two Bit Digital offers transparent, fixed-price SaaS MVP development starting at £7,500. No hourly rates. No surprises. You know exactly what you are paying before we start. See our full pricing or book a free scope session.
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