If you have a software idea and need a trusted UK team to build it properly, you are in the right place. By Design UK delivers end-to-end SaaS platform development at a level that sits firmly between the unpredictability of a freelancer and the bloat of a large agency. We work with founders, scale-ups and established businesses across the United Kingdom who need a production-ready SaaS product built on time, at a fixed price, with the source code fully in their hands from day one.
A genuine SaaS build is far more than a website with a login page. It involves architecture planning, multi-tenant database design, subscription billing integration, role-based access control, API development, third-party integrations, security hardening and ongoing scalability. Our SaaS development service covers the entire lifecycle, from discovery and technical scoping through to deployment, documentation and post-launch support.
We use AI-accelerated development workflows to compress timelines without cutting corners. This means you get to market faster than you would with a traditional agency, while still receiving clean, maintainable code that your own team or future developers can work with confidently. There are no black-box vendor lock-ins here.
SaaS platform builds with By Design UK are priced between £18,000 and £650,000+ depending on the complexity of your product, the number of integrations required and the scope of your user-facing features. An early-stage MVP with core functionality typically sits toward the lower end of that range, while a fully featured multi-module platform with custom analytics, complex billing logic and enterprise-grade infrastructure sits further up the scale.
Every engagement begins with a scoping session. You receive a clear, written fixed-price proposal before any work begins. No vague day-rate estimates, no surprise invoices at the end of a sprint. If you are also considering a supporting ecommerce presence alongside your SaaS product, our Shopify services handle that at a separate fixed price from £499 through to £18,999.
Most founders building a SaaS product face the same frustrating choice. Freelancers are often cheaper upfront but come with significant risk: shifting availability, no formal handover process, code that only they understand and, critically, ambiguity around intellectual property and source code ownership. On the other side, large agencies typically move slowly, charge for every meeting and revision, and wrap their processes in enough opacity that you rarely feel in control of your own project.
By Design UK exists in the space between those two options. You work with a consistent, senior-led UK team. You receive a fixed price and a clear delivery timeline. And when the project completes, you own everything, the code, the infrastructure configuration, the documentation. No retainer required to access your own product.
We do not just build SaaS platforms for clients. We build and operate our own. Tackly.co.uk is a live, multi-toolkit SaaS platform conceived, developed and run by the By Design UK team. It demonstrates our ability to handle real user traffic, subscription logic, multi-feature architecture and ongoing product iteration. When you hire us to build your platform, you are working with a team that understands what it means to be a SaaS operator, not just a SaaS builder.
Our office is based at Office 13, 25 Mollison Avenue, Enfield, EN3 7LW. We are a UK company, accountable under UK law, and we work with clients who value directness and transparency over corporate process. You can read more about our approach on our about page.
Launching your SaaS platform is the beginning, not the end. Our support plans for SaaS products start from £797 per month and cover ongoing maintenance, security updates, feature additions, infrastructure monitoring and priority response times. Your product will continue to evolve, and we will be here when it does.
Yes, absolutely. Full source code ownership is a core part of every By Design UK SaaS project. Once the final invoice is settled, all code, assets and documentation are transferred to you. There are no licensing restrictions or ongoing dependencies on us to run your product.
Timelines vary based on scope, but a focused MVP typically takes between eight and sixteen weeks from the start of development. Our AI-accelerated workflows help us move faster than a traditional agency without sacrificing quality. We agree the timeline in writing before work begins.
We build a wide range of SaaS products including B2B workflow tools, subscription platforms, marketplace SaaS, internal operations software, client portals and API-driven platforms. If you have a concept that involves recurring access to a software product, we can scope and build it.
The simplest first step is to get in touch via our contact page or email us directly at info@bydesignuk.co.uk. We will arrange a no-obligation scoping call to understand your requirements and follow up with a fixed-price proposal tailored to your project.
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