Your certified Umbraco agency
16i is a certified Umbraco partner. We design, build, upgrade and migrate Umbraco websites for organisations that want their CMS to work properly: flexible enough to grow with, robust enough to rely on, and built by a team that knows the platform inside out.
We're based in Cheltenham, Gloucestershire, and we work with clients across the UK and internationally. Whether you're starting a new Umbraco build, moving off an ageing platform, or facing an upgrade you've been putting off, we can help.
What we do with Umbraco
We handle the full lifecycle of an Umbraco project, with one team from first conversation to long-term support.
New Umbraco builds
Design-led, user-centred websites engineered to scale. We start with your users, goals and constraints, then build something that fits, not a theme with your logo dropped in.
Umbraco upgrades
If you're on an older version, we'll get you onto a supported one. The current path for most sites is Umbraco 17 LTS, and we manage the whole process so nothing breaks along the way.
Umbraco migrations
Moving from WordPress, Sitecore, a bespoke CMS or an unsupported Umbraco version? We migrate content, preserve your SEO, and rebuild on a platform you'll actually enjoy using.
Headless and custom Umbraco
Where a project calls for a headless front end or custom back-end integration, we build it. Umbraco is our default, not our limit.
Ongoing support and hosting
Once you're live, we offer ongoing support and hosting on Azure green servers, so your site stays fast, secure and up to date.
Why Umbraco?
Umbraco is an open-source .NET content management system that currently powers over half a million websites. We choose it for most projects because it gets the balance right: it's genuinely flexible for developers, straightforward for content editors, and SEO-capable out of the box without a stack of third-party plugins. You own your content, you're not locked into licence fees, and the platform scales from a brochure site to a complex multi-site estate.
We've written a full breakdown in our guide to the top ten benefits of using Umbraco if you'd like the detail.
Why choose 16i as your Umbraco agency
We're a certified Umbraco partner
Independent recognition of our experience, not a self-awarded badge.
Full-service, one team
Strategy, design, build and support under one roof. No handoffs, no dropped context.
Real .NET depth
Front and back-end in .NET, Umbraco and bespoke frameworks.
B Corp certified
Independently verified standards on people, planet and governance.
Green hosting
Azure's completely green infrastructure, powered by renewable energy.
Umbraco upgrades: don't get left on an unsupported version
Umbraco version support doesn't last forever. Umbraco 16 reached end of support in June 2026, and Umbraco 13 support ends in December 2026. Once a version is unsupported, you stop receiving security patches and bug fixes, which over time turns into a real risk, not just a technical footnote.
If your site is on an older version, the sensible move is to upgrade to Umbraco 17 LTS. We handle the planning, the upgrade itself, and the testing. We've explained the business case in our article on upgrading to Umbraco 17.
Who we work with
Our clients range from Cheltenham organisations to national charities, arts institutions and international businesses, including Everyman Theatre, Grant UK, Dynamic Lives, The Sub Rooms and Elmore Court
16i invested a lot of time and effort into understanding what our sector was about. What was so impressive was their technical level, their professionalism, and their commitment to understanding what you need as a customer, plus their continual support throughout the journey.
Frequently asked questions
Are you a certified Umbraco partner?
Yes. We're a certified Umbraco partner, which means our experience and standards with the platform have been independently recognised by Umbraco. It's our CMS of choice for most projects.
Can you upgrade my existing Umbraco site?
Yes. We upgrade Umbraco sites from older versions to current supported releases, typically Umbraco 17 LTS. We plan the upgrade, carry it out and test thoroughly so your site moves across with minimal disruption.
Can you migrate my site from another CMS to Umbraco?
Yes. We migrate sites onto Umbraco from platforms like WordPress, Sitecore and bespoke systems, moving your content across and protecting your search rankings in the process.
Do you provide ongoing Umbraco support?
Yes. We offer ongoing support and maintenance, plus hosting on Azure green servers, so your site stays secure, fast and up to date after launch.
How much does an Umbraco project cost?
It depends on scope. A focused brochure website typically starts from £8,000–15,000, while larger Umbraco builds, upgrades and complex integrations are quoted individually. We provide a detailed proposal after an initial discovery conversation, with no ballpark guesses up front.
Ready to talk?
If you're looking for an Umbraco agency that will treat your project properly, we'd like to hear about it. An initial conversation is free, no-obligation, and usually the most useful 45 minutes you'll spend this month.