Airbnb started as a simple idea: let people rent out a spare room to travellers. Nobody involved was a technologist first — they were people who spotted a gap and found a way to build it. Today it’s a global booking platform used by hundreds of millions of people. Duolingo turned “what if learning a language felt like a game” into a platform used by half the planet. Your idea for a booking, rental, or marketplace platform could follow the same path — the difference is having the right team turn the idea into working software rather than another pitch deck gathering dust.
That’s where By Design UK comes in. We’re a UK software development agency built for people exactly in your position: non-technical founders with a clear vision for a platform — whether that’s short-term property rentals, space hire, equipment sharing, or any two-sided marketplace where hosts meet guests. We sit deliberately between a freelancer and a traditional agency, and we build fixed price, using AI-accelerated development to move faster than either, while you keep full ownership of every line of code.
Pricing depends entirely on scope. A focused first version with listings, search, booking, payments, and messaging typically sits at the lower end of our platform development range, which spans £18,000–£650,000+ depending on complexity, integrations, and scale. A simple booking marketplace MVP with core features costs far less than a full platform with host verification, dynamic pricing, dispute resolution, and a mobile app. We scope everything upfront so you know the number before we start — no vague estimates, no scope creep billed by the hour.
If your idea is closer to an online store or curated rental catalogue rather than a full booking marketplace, our Shopify build service (from £499–£18,999) may actually be the faster, cheaper route to market — we’ll tell you honestly which model fits, rather than pushing you toward the more expensive build by default.
Most people exploring a platform like this end up choosing between two flawed options. Freelancers are often affordable but unreliable — projects stall, communication goes quiet, and if they disappear mid-build you’re left with unfinished, undocumented code. Traditional agencies are more dependable but notoriously slow and expensive, with opaque day-rate pricing that balloons once “phase two” begins, and contracts that sometimes leave you without full rights to your own product. By Design UK was built to close that gap: agency-level reliability and process, fixed pricing agreed before work starts, and — critically — you own 100% of the source code from day one. No lock-in, no ongoing dependency on us unless you want it.
We don’t just talk about building platforms — we run one. Tackly.co.uk is a live, multi-toolkit platform we designed, built, and continue to operate, handling real users and real transactions every day. It’s the clearest evidence of what we can deliver: production-grade software, not a prototype. When you work with us on a booking or rental marketplace, you’re working with a team that has already shipped and maintained something equally complex — UK-based, fixed-price, full code ownership, start to finish.
We help you decide which of these matter for version one and which can wait — the goal is a platform real users can book through as quickly as possible, then grow from there.
Launch is the beginning, not the end. Our ongoing support plans start from £797/month for platform builds (or £299/month for Shopify builds), covering hosting oversight, updates, bug fixes, and incremental feature work so your platform keeps improving as your user base grows. You’re never locked into a plan you don’t need — many clients own their code outright and simply call us when they want new features built.
Curious what your idea would actually cost and take to build? Read more about how we work or get in touch for a fixed-price scope, no obligation.
No. Most of our clients have never written a line of code. We translate your idea into a working platform, explaining decisions in plain English throughout.
Yes. Full source code ownership is included as standard, with no licensing fees or vendor lock-in after the project completes.
A focused first version typically takes a few months depending on scope, thanks to AI-accelerated development that speeds up build time without cutting corners on quality.
Yes. We agree scope and price before work begins. If you request extra features beyond the original scope, we quote those separately so there are never surprise invoices.
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