Web development in Cheltenham, built on .NET
16i is a B Corp-certified web development agency based in Cheltenham. We build websites and web applications on .NET and Umbraco — not WordPress themes or off-the-shelf platforms — for organisations that need something that works properly and keeps working as they grow.
Our studio is on Rockfield Business Park in Cheltenham. Our clients include the Everyman Theatre, Grant UK, Dynamic Lives, Oxford Ski, and the Roald Dahl Estate. If you’re looking for a web development partner in Gloucestershire who can match technical ambition with design quality, we’d like to hear about your project.
Why businesses choose 16i for web development in Cheltenham
There are a handful of good web development agencies in Cheltenham. What’s rarer is one that combines serious .NET development capability with design craft, local presence, and a track record on genuinely complex projects.
In Cheltenham, accountable in person
Our studio is in Cheltenham. We meet clients here, run discovery workshops here, and are easy to reach when a decision needs to be made quickly. For projects that matter to your organisation, proximity and accountability are worth more than the marginal cost saving of going remote.
We build in .Net, not PHP
Most Cheltenham web agencies build on WordPress — a PHP platform that works well for straightforward sites but hits its limits fast when projects get complex. Our stack is .NET and C#, which means cleaner architecture, better security, and a natural fit for enterprise integrations, bespoke portals, and Umbraco CMS builds. If your last agency told you something wasn’t possible, it might just have been a platform limitation.
Bespoke by default
We don’t start from a theme. Every project begins with understanding your users and your goals — then we build something that fits your business specifically, not one that sort of works if you squint. That approach costs more upfront and saves significantly more over three years.
B Corp certified
We’re one of a small number of web development agencies in the UK to hold B Corp certification — independently verified for our standards on people, planet, and governance. For organisations who care about the supply chain behind their digital products, that matters.
Web development services in Cheltenham
We handle the full build — front-end, back-end, CMS, and integration — under one roof. No handoffs to third-party developers, no agency markup on outsourced work.
How we approach web development projects
Every project is different. But our process is consistent — structured enough to keep complex projects on track, flexible enough to adapt when things change.
1. Discovery
We get under the skin of your business, your users, and your technical constraints before any design or code is produced. This step prevents expensive rework later.
2. Architecture & UX
Information structure, user journeys, and technical architecture decisions. We validate the approach before building it.
3. Design
Brand-aligned, responsive visual design produced in-house by our design team. Not stock templates.
4. Development
Front-end and back-end built against a clear specification in .NET, with fortnightly review points.
5. QA & launch
Comprehensive testing across devices, browsers, and user journeys. SEO handover documentation included.
6. Ongoing support
Post-launch support, hosting, and Umbraco maintenance options available for long-term partnerships.
Frequently asked questions
How much does web development in Cheltenham cost?
Project costs depend on scope and complexity. A focused brochure website with a Umbraco CMS typically starts from £8,000–15,000. Bespoke web applications, portals, and complex integrations are scoped and quoted individually. We’ll give you a detailed proposal after an initial discovery conversation — no ballpark estimates until we understand what you actually need.
Do you build on WordPress?
No — we build on .NET, C#, and Umbraco. WordPress is a capable platform for straightforward sites, but our expertise and our clients’ projects are almost always more complex than it handles well. If you’re currently on WordPress and thinking about a migration, we’re happy to have an honest conversation about whether it’s worth moving.
How long does a web development project take?
A typical website project runs 10–16 weeks from kick-off to launch. Bespoke web applications and complex integrations are scoped individually and timelines are agreed at the outset. We set clear milestones and stick to them — and we’ll tell you upfront if scope creep is going to affect the timeline.
Do you work with clients outside Cheltenham?
Yes — roughly half our clients are based outside Gloucestershire, including in London, Oxford, and internationally. We’re Cheltenham-based and value in-person working, but we run most of our projects remotely and collaboratively without any loss of quality.
What’s the difference between web design and web development?
Web design is the visual and UX discipline — how the site looks and how users move through it. Web development is the build — the code that makes it function. At 16i both disciplines sit in the same team, which means design decisions are informed by technical constraints and vice versa. You don’t get a beautiful design that’s impossible to build.
Start a web development conversation
If you’re looking for a web development agency in Cheltenham — or anywhere in the UK — and you need something built properly rather than quickly, we’d like to hear about it. We’re a B Corp-certified agency, which means we’re as careful about how we work as what we deliver. An initial conversation is free and no-obligation.