London’s software market moves fast, and founders here don’t have time for six-month discovery phases or freelancers who disappear mid-sprint. By Design UK builds AI-powered SaaS platforms for London-based startups, scale-ups, and established businesses looking to launch or rebuild digital products without the traditional agency price tag or the risk of working with a lone contractor. We sit deliberately between the two: structured enough to deliver reliably, lean enough to move quickly and price fairly.
Whether you’re a fintech team in Shoreditch, a proptech operator near Canary Wharf, or a professional services firm in the City looking to productise your expertise into software, our approach is the same: fixed-price contracts, AI-accelerated build pipelines, and full source code ownership handed to you at delivery. No retained IP, no vendor lock-in, no surprises on the invoice.
London has no shortage of software talent, but it has a real shortage of dependable delivery. Freelancers are often excellent individually but represent a single point of failure — illness, other clients, or simply disappearing can stall your roadmap for weeks. Traditional agencies, meanwhile, tend to layer on account managers, opaque day-rate pricing, and lengthy statements of work that push costs well beyond what a growing business can justify, often without ever handing over clean, owned source code at the end.
We built By Design UK to close that gap. Our development process uses AI tooling to compress the timeframes typically associated with agency-grade builds, which means London clients get senior-level engineering output at fixed prices, with full transparency from the first proposal to the final deployment. You own everything we build — the codebase, the infrastructure setup, the documentation — from day one.
SaaS builds through By Design UK typically range from £18,000 to £650,000+, depending on the complexity of your platform, integrations, and the number of user roles or modules involved. A focused MVP validating a single core workflow sits at the lower end of that range, while multi-tenant platforms with complex billing, permissions, and third-party integrations move toward the top. If your requirement is closer to an ecommerce storefront rather than a full SaaS product, our Shopify services start from £499 and scale to £18,999 for highly bespoke builds. Every quote is fixed before work begins — no hourly billing, no scope creep charged by the hour.
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. It’s a working demonstration of the same engineering standards, architecture decisions, and AI-accelerated build methods we apply to client projects. If you want to see how a By Design UK platform performs in production before committing to a project, Tackly is the evidence. Our team is UK-based, our pricing is fixed and disclosed upfront, and every client leaves with full ownership of their code — the same principles that shaped Tackly from day one.
Many London clients start with a smaller fixed-price build to validate demand, then extend into a larger platform once traction is proven — our pricing structure and ownership model make that transition straightforward, without renegotiating who owns what. Get in touch via our contact page to discuss your project, or read more about how we work on our about page.
While we work with clients across the UK, our London-based conversations tend to centre on the same pressures: investor timelines, competitive markets, and the need to ship something credible quickly without burning runway on agency overhead. Being UK-based means straightforward communication, no timezone friction, and a team that understands UK compliance, hosting, and data considerations relevant to platforms serving London’s business and consumer markets.
No — we work with clients across the UK, but we have strong experience supporting London-based startups and businesses specifically, including their compliance and investor-reporting needs.
Yes, once scope is agreed the price is fixed. If requirements genuinely expand beyond the original scope, we agree any change in cost with you upfront before proceeding — there’s never a surprise invoice.
Completely. Unlike many agencies that retain rights or platform lock-in, every By Design UK client receives full source code and infrastructure ownership on delivery.
AI tooling speeds up repetitive engineering work like scaffolding, testing, and integration boilerplate, freeing our senior developers to focus on architecture and quality — the same approach used to build and run Tackly.co.uk.
Image via Pixabay
Tell us what you need — we'll come back with a quote within 24 hours.
Thank you for your enquiry. We'll review your requirements and come back to you with a proposal within 24 hours.
Leave your details and we'll call you back at a time that suits you.
We've received your request and will call you back at your preferred time. If it's urgent, email us at info@bydesignuk.co.uk