Enterprise teams across the UK are under pressure to ship robust SaaS products faster, without inheriting the overheads of a traditional agency or the risk of a lone freelancer. By Design UK sits deliberately between the two: a UK-based development team that builds enterprise-grade SaaS platforms on fixed prices, using AI-accelerated engineering workflows, and hands over full source code ownership on every project. No retainers you can’t escape, no black-box pricing, no vendor lock-in.
We work with growing businesses and established enterprises who need custom SaaS development that behaves like a product, not a prototype: proper authentication, billing, multi-tenant architecture, admin tooling, and the operational maturity to run at scale. Whether you’re replacing a legacy internal system or launching a new commercial platform, we scope the build around your actual requirements rather than a generic package.
Enterprise SaaS builds with By Design UK typically range from £18,000 to £650,000+, depending on the complexity of your data model, integrations, compliance requirements, and the number of user roles and workflows involved. A focused internal tool or single-module platform sits at the lower end; a multi-tenant enterprise SaaS product with complex permissions, third-party integrations, and custom reporting sits toward the top. We agree the fixed price before development starts, so there’s no scope creep billed by the hour and no surprises at invoice time. For teams that also need commerce-facing infrastructure alongside their SaaS platform, our Shopify build services range from £499 to £18,999 and can run in parallel or integrate directly via API.
Once your platform is live, ongoing reliability matters as much as the initial build. Our support plans start from £797/month for SaaS platforms and £299/month for Shopify builds, covering monitoring, security patching, performance tuning, and a direct line to the engineers who actually built your system, not a rotating support desk.
Freelancers are often the cheapest route in, but that comes with real risk: single points of failure, inconsistent availability, and code that’s difficult to hand over cleanly if the relationship ends. Traditional agencies solve the reliability problem but introduce new ones — long discovery phases, layers of account management, opaque day-rate pricing that balloons past the original estimate, and delivery timelines measured in quarters rather than weeks. Enterprise buyers are frequently left choosing between speed and risk, or reliability and cost.
By Design UK removes that trade-off. You get a small, senior team using AI-accelerated development practices to compress build timelines without cutting corners on architecture or code quality. Every project is fixed-price and scoped upfront, every line of code belongs to you at handover, and there’s no agency-style layer of project managers between you and the people writing the software.
Rather than ask you to take positioning statements on trust, we point to Tackly.co.uk, a live multi-toolkit SaaS platform designed, built, and operated by our own team. Tackly demonstrates the same standards we bring to enterprise client work: multi-tenant architecture, subscription billing, scalable infrastructure, and a product that runs commercially day-to-day rather than sitting as a portfolio piece. It’s evidence that our capability extends beyond client briefs — we build and maintain our own SaaS product to the same fixed-price, ownership-first standard we offer clients, from a UK-based team you can actually meet and speak with.
If you’re scoping an enterprise SaaS build and want a straight answer on cost, timeline, and ownership, get in touch for a fixed-price proposal. You can also read more about our team and approach on the about page.
Timelines depend on scope, but AI-accelerated development typically lets us deliver enterprise SaaS platforms faster than traditional agency timelines, with clear milestones agreed before the project starts.
Yes. Full source code and intellectual property ownership transfers to you on project completion, with no licensing restrictions or ongoing dependency on By Design UK.
Yes, we regularly build SaaS platforms that integrate with Shopify via API for order data, customer records, or commerce workflows, alongside our dedicated Shopify build services.
We offer ongoing support plans from £797/month for SaaS platforms, covering monitoring, security updates, and continued development, delivered by the same engineers who built your platform.
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