If you’re searching for a genuinely custom Shopify theme rather than a tweaked template, you’re likely stuck choosing between a freelancer who might disappear mid-project and a traditional agency that quotes six weeks and five figures before writing a line of code. By Design UK sits deliberately between the two: a UK-based development studio offering fixed-price bespoke Shopify builds, AI-accelerated delivery timelines, and full source code ownership handed to you at completion — no retained rights, no ongoing dependency on us unless you choose it.
We design and build Shopify themes from scratch around your brand, your catalogue structure, and your conversion goals — not a page-builder skin bolted onto a stock theme. That means custom Liquid templating, tailored product and collection logic, considered performance optimisation, and a UI that’s built for your customers rather than adapted from someone else’s. Every build is scoped and priced upfront, so you know the total cost before work begins.
Our Shopify build services run from £499 for focused theme customisation and conversion-rate improvements, up to £18,999 for a fully bespoke, multi-template storefront with custom app integrations, advanced merchandising logic, and headless-ready architecture. Where you land within that range depends on catalogue complexity, third-party integrations, and how much custom functionality your store needs beyond standard Shopify theming. We’ll give you a fixed quote after a short scoping call — not a vague estimate that grows once work starts.
For merchants planning something bigger than a storefront — internal tooling, a customer portal, or a full SaaS product sitting alongside your Shopify store — our SaaS development service covers builds from £18,000 up to £650,000+ for enterprise-grade platforms, using the same fixed-price, full-ownership model.
Freelancers are often the cheapest route on paper, but that value can disappear fast if they drop off mid-project, hand over undocumented code, or simply lack the capacity for anything beyond small tweaks. Traditional agencies solve the reliability problem but usually introduce new ones: long lead times, layers of account management, and pricing structures that stay opaque until the invoice arrives. By Design UK is structured to avoid both failure modes — a small, senior UK team, AI-assisted development that compresses timelines without cutting corners, transparent fixed pricing agreed before work starts, and complete source code ownership so you’re never locked into us for future changes.
This isn’t a theoretical positioning statement. Tackly.co.uk is a live, multi-toolkit SaaS platform we designed, built, and continue to operate ourselves. It’s day-to-day proof that we can architect, ship, and maintain production software at scale — the same engineering discipline that goes into every Shopify theme we build, whether it’s a focused customisation project or a complex multi-integration storefront.
Whether you’re rebuilding an underperforming store or launching a new brand, a bespoke theme should reflect how your business actually sells — not force your catalogue into someone else’s template logic. That’s the gap we build to fill, with the reliability of an agency and the speed and cost-efficiency of a lean, AI-accelerated team.
Ready to scope your project? Get in touch for a fixed quote, or read more about our team and how we work.
Most bespoke Shopify projects take between two and eight weeks depending on complexity, catalogue size, and the number of custom integrations required. AI-accelerated development helps us compress build timelines without reducing testing or quality control.
Yes. Full source code ownership is handed over at project completion as standard, with no licensing restrictions or ongoing dependency on By Design UK unless you choose an optional support plan.
Yes, we regularly rebuild existing stores onto bespoke themes, migrating products, collections, metafields, and app configurations while minimising disruption to live trading.
Where a project needs custom backend logic, a customer portal, or a standalone application, we can scope this as a SaaS build alongside your Shopify store, priced separately under our SaaS development service.
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