If you’re planning to build a SaaS platform with Stripe billing baked in from day one, you need a partner who understands subscription logic, webhooks, metered usage, and UK compliance — not just a generic “build me an app” quote. By Design UK is a UK-based software development team that sits between hiring a freelancer and briefing a traditional agency. We deliver fixed-price SaaS builds with Stripe integration, AI-accelerated development timelines, and full source code ownership handed to you on completion.
Every SaaS product we build includes Stripe Checkout or Billing configured for the way your business actually charges: monthly and annual plans, free trials, usage-based tiers, seat-based pricing, invoicing, and dunning for failed payments. We handle the tax, webhook reliability, and customer portal setup so your platform is revenue-ready, not just functionally complete.
Our SaaS development engagements range from £18,000 to £650,000+, depending on scope, integrations, and complexity. A lean MVP with core Stripe billing, authentication, and a single core workflow typically sits at the lower end of that range. Multi-tenant platforms with role-based permissions, advanced billing logic, third-party integrations, and custom reporting sit higher up. Every project is quoted as a fixed price before work begins — no hourly drift, no scope creep billed by the hour.
If your product is ecommerce-first rather than subscription SaaS, our Shopify services team builds Stripe-connected storefronts on the same fixed-price, full-ownership model.
Freelancers are often the cheapest route on paper, but reliability is the real risk: single points of failure, inconsistent availability, and frequently no proper handover of source code or infrastructure access when the contract ends. Traditional agencies solve reliability but introduce their own problems — long discovery phases, opaque day-rate pricing that balloons mid-project, and layers of account management between you and the people actually writing the code. By Design UK is structured to remove both failure modes: a small, senior UK team, fixed pricing agreed upfront, and every line of code owned by you from the first commit.
We accelerate build timelines using AI-assisted development tooling for boilerplate, testing, and documentation — not for cutting corners on architecture. That means faster delivery without sacrificing the code quality your engineering team will need to maintain and extend the platform after launch.
Rather than ask you to take our capability on faith, we point to Tackly.co.uk — a live, multi-toolkit SaaS platform we designed, built, and continue to operate ourselves. Tackly runs Stripe billing for multiple subscription tiers, handles real users at scale, and demonstrates the same architecture patterns — authentication, billing, tenant separation, and admin tooling — that go into every client SaaS build. It’s the clearest evidence we can offer that we don’t just design software; we run it in production, day in and day out, as a UK company with a fixed office and a direct line of accountability.
Once your platform is live, ongoing iteration matters as much as the initial build. Our support plans cover monitoring, security patching, Stripe webhook health checks, and feature development, so your platform keeps pace with customer demand after launch rather than stalling once the initial contract ends.
To scope your build, get in touch via our contact page or read more about how we work on the about page. We’ll talk through your pricing model, technical requirements, and timeline before providing a fixed quote — no obligation, no hourly-rate ambiguity.
A focused MVP with core Stripe billing typically takes a small number of months depending on scope. AI-accelerated development shortens build time on repetitive components, letting our team focus on architecture, billing logic, and testing. We agree a realistic delivery timeline as part of your fixed-price quote.
Yes. Full source code ownership transfers to you on project completion, including repository access, infrastructure configuration, and documentation. There is no vendor lock-in and no ongoing licence requirement to keep running your own platform.
Yes. We regularly migrate platforms from manual invoicing or legacy payment providers onto Stripe Billing, including historic subscription data, customer portal setup, and webhook reconciliation to avoid billing gaps during the switch.
Most clients move onto one of our support plans, starting from £797/month for SaaS platforms, covering monitoring, security updates, Stripe webhook maintenance, and ongoing feature development so the platform continues improving after launch.
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