Hey, if you're knee-deep in picking a team to handle your Umbraco project, you know it's not just about slapping together a site-it's about building something solid that scales with your business, handles custom tweaks without headaches, and keeps everything running smooth for years. Umbraco's this fantastic open-source CMS, flexible as heck on .NET, perfect for everything from simple brochures to complex e-commerce setups or member portals. But the real magic? Pairing it with a UK-based agency that gets the local scene, nails SEO and security, and delivers on time without the drama.

In the UK, you've got a solid lineup of these agencies-think certified partners who've racked up awards, handled big-name clients, and turned out hundreds of projects. We're talking firms that specialize in everything from headless setups to Azure hosting, all while keeping things intuitive for your content folks. A rundown of the top ones has been compiled based on recent reviews, client wins, and real-world results. No fluff, just the ones standing out for expertise, responsiveness, and that knack for over-delivering. Whether you're migrating from an old version or starting fresh, these are the teams making waves in 2025. Let's dive in.

 

1. OSKI Solutions

We’re OSKI Solutions, an Estonia-based team that partners with UK businesses on Umbraco-powered digital projects from concept to continuous growth. We deliver custom software and web development that modernises your operations and scales with your ambitions-whether that’s a complete end-to-end build, dedicated team augmentation, or smart IT outsourcing. Our developers create clean, future-proof solutions that blend effortlessly into what you already have, so everything from a fresh platform to an evolving enterprise system stays smooth, reliable and easy to manage long after launch.

Umbraco sits at the heart of many of our projects, especially when strong .NET architecture is key. We craft rich editorial experiences for e-commerce, healthcare, fintech, edtech, logistics, manufacturing, retail, professional services and SaaS clients, often weaving in React, Node.js, Azure, AWS, custom APIs, CRM or ERP integrations, and even AI-driven features in C# or Python. Serving Umbraco development agencies and direct clients across the UK, we match your pace, keep communication open and human, and act less like a vendor and more like the natural extension of your own team.

Key Highlights:

• Based in Estonia
• Focus on .NET and Umbraco projects
• Executive leads with software backgrounds
• Covers cloud and AI alongside web
• Provides services to UK clients

Services:

• Umbraco website development
• Cloud deployments on AWS and Azure
• Frontend builds with React and Vue
• AI integrations for machine learning
• DevOps and CI/CD pipelines
• UI/UX design

Contact Information:

• Website: oski.site
• Phone: +48571282759
• Email: contact@oski.site
• Address: Kaupmehe tn 7, 10114 Tallinn, Estonia
• LinkedIn: www.linkedin.com/company/oski-solutions

 

2. Codeminers

Codeminers operates from Nottingham and focuses on creating custom software along with website builds. Developers there write applications from the ground up and handle integrations that fit specific business setups. The company works as part of client operations to grasp processes deeply, which helps shape solutions that streamline workflows.

Website projects draw on certified skills in Sitecore and Umbraco platforms. Codeminers also covers areas like database design and mobile apps, using agile methods to keep deliveries on track.

Key Highlights:

• Based in Nottingham
• Certified in Sitecore and Umbraco
• Handles project recovery for software and web
• Offers software audits and consultancy

Services:

• Bespoke software development
• Software integrations
• Umbraco development
• Sitecore development
• Database design
• Mobile app development
• Website personalisation
• Project recovery

Contact Information:

• Website: www.codeminers.co.uk
• Phone: 01158224700
• Email: hello@codeminers.co.uk
• Address: Code Miners Limited 32 Leacroft Road Aspley Nottingham
• LinkedIn: www.linkedin.com/company/codeminers-limited
• Facebook: www.facebook.com/codeminers
• Twitter: x.com/thecodeminers
• Instagram: www.instagram.com/codeminers

 

3. PureNet

PureNet handles ecommerce and portal builds for businesses in various sectors. The company designs integrated systems that connect with existing operations, often involving complex setups. Past projects include customer portals and multisite configurations on Umbraco.

Developers at PureNet work with platforms to create functional sites aimed at revenue growth. Services cover design, integration, and custom portal work tailored to specific needs.

Key Highlights:

• Delivers solutions for B2C and B2B
• Manages multisite Umbraco projects
• Builds secure replacement portals
• Integrates ecommerce with business processes

Services:

• Ecommerce development
• Bespoke portal development
• System integrations
• Web design
• Umbraco multisite setups
• Click & collect solutions

Contact Information:

• Website: www.purenet.co.uk
• Phone: 0208 819 1620
• Email: sales@purenet.co.uk
• Address: 344-354 Gray's Inn Road London WC1X 8BP
• LinkedIn: www.linkedin.com/company/purenet
• Facebook: www.facebook.com/purenetsolutions
• Twitter: x.com/PureNet

 

4. Fresh Egg

Fresh Egg runs customer experience discovery to map out how people interact with digital channels. The agency digs into real user feedback to find pain points and suggest fixes. Work covers web builds and ongoing optimization, all tied to measurable shifts in performance.

Based in Worthing, Fresh Egg keeps a straightforward approach - no hidden steps, just clear updates. The agency also runs training programs for new digital marketers. Clients range from local firms to larger operations needing detailed journey analysis.

Key Highlights:

• Specializes in CX discovery process
• Operates from Worthing office
• Provides digital marketing training
• Focuses on transparent updates

Services:

• Customer experience discovery
• Web build and optimization
• Digital marketing
• Analytics and reporting
• Training academy programs

Contact Information:

• Website: www.freshegg.co.uk
• Phone: 01903 337 580
• Address: 1-13 Buckingham Road, Worthing, West Sussex, BN11 1TH, United Kingdom
• LinkedIn: www.linkedin.com/company/fresh-egg
• Facebook: www.facebook.com/FreshEggUK
• Twitter: x.com/freshegg
• Instagram: www.instagram.com/freshegguk

 

5. Moore-Wilson

Moore-Wilson operates offices in London and Salisbury, handling full-cycle digital projects. Developers there work with open-source CMS platforms like Umbraco, Drupal, and WordPress to create sites for brands, government bodies, and NHS clients. The agency started with design work and expanded into web and marketing over the years.

Support covers hosting, mobile apps, and search marketing alongside initial builds. Moore-Wilson takes on one-off jobs or longer partnerships, depending on what clients need. The setup allows for branding, SEO, and usability tweaks all under one roof.

Key Highlights:

• Offices in London and Salisbury
• Works with government and NHS
• Handles hosting and mobile apps
• Offers search marketing services

Services:

• Umbraco development
• Web design and build
• Digital strategy
• SEO and PPC
• Branding and print design
• Website support and hosting

Contact Information:

• Website: www.m-w.co.uk
• Phone: 020 73793300
• Email: hello@m-w.co.uk
• Address: Third Floor 11 Slingsby Place St Martin's Courtyard Covent Garden London
• LinkedIn: www.linkedin.com/company/moorewilson
• Twitter: x.com/moorewilson

 

6. Gecko

Gecko starts every job by figuring out exactly what the client wants to achieve with a website or digital setup. Developers there mix creative ideas with solid tech to build solutions that fit specific gaps in business operations. The company keeps things practical, asking straightforward questions upfront to avoid guesswork later.

Umbraco sits at the core of many projects, handled by developers who know the platform inside out. Gecko also covers front-end work and support, with a setup that lets clients stay in the loop. The office runs on clear communication and a bit of humor to keep projects moving without stress.

Key Highlights:

• Focuses on Umbraco and .NET frameworks
• Offers ongoing support for sites
• Includes designers and marketers in-house
• Based in the UK with a small crew

Services:

• Umbraco development
• Web design and build
• Front-end development
• Digital marketing
• Project management and support

Contact Information:

• Website: www.wearegecko.co.uk
• Phone: +44 (0) 131 240 3390
• Email: hello@wearegecko.co.uk
• Address: Orchard Brae House 30 Queensferry Road Edinburgh EH4 2HS
• LinkedIn: www.linkedin.com/company/gecko-agency-ltd
• Twitter: x.com/wearegecko
• Instagram: www.instagram.com/wearegecko

 

7. Fuelius

Fuelius builds websites on Umbraco and HubSpot, tying them into CRM systems for smoother customer flows. The company looks at the whole buyer journey, spotting where automation or better data can cut out hassle. Projects often link sales and marketing tools so everything talks to each other.

Work includes inbound campaigns and site optimizations aimed at turning visitors into leads. Fuelius handles implementations from scratch, making sure security and performance stay solid. Clients get sites that load fast and adapt as the business changes.

Key Highlights:

• Elite HubSpot partner
• Combines Umbraco with CRM setups
• Runs inbound marketing campaigns
• Focuses on conversion-driven sites

Services:

• Umbraco website development
• HubSpot CRM implementation
• Inbound marketing
• Automation and integrations
• Web optimization

Contact Information:

• Website: www.fuelius.com
• LinkedIn: www.linkedin.com/company/fuelius
• Facebook: www.facebook.com/fuelius
• Twitter: x.com/fuelius_agency
• Instagram: www.instagram.com/fuelius

 

8. iConnect Digital

iConnect Digital creates custom software and extends existing systems like ERP or CRM platforms. Developers there write code from the ground up or add features to off-the-shelf tools, always with an eye on future AI hooks. Umbraco comes into play for CMS needs, paired with mobile apps or eCommerce builds.

The company operates offices in the UK and India, handling projects across sectors like retail and healthcare. Clients sign NDAs right away, which keeps ideas safe while work gets underway. iConnect sticks to clear processes so everyone knows what’s happening at each step.

Key Highlights:

• Builds bespoke extensions for ERP/CRM
• Covers Umbraco CMS projects
• Offers MVP development
• Includes UI/UX design

Services:

• Umbraco CMS development
• Custom software solutions
• Mobile app development
• eCommerce platforms
• System integrations

Contact Information:

• Website: iconnectdigital.co.uk
• Email: reach@iconnectdigital.co.uk
• Address: Dns House, 382 Kenton Road, Harrow, London, Middlesex, United Kingdom, HA3 8DP

 

9. Digital Wonderlab

Digital Wonderlab puts user needs first when shaping websites, apps, or broader digital strategies. Developers there blend research with creative input to create tools that fit specific goals, whether for charities, universities, or energy firms. Projects often start with clear questions about impact, which helps keep everything aligned from day one.

Accessibility and ongoing support play big roles in the work. The agency handles migrations for complex sites and adds features that make content easy to manage. Clients stick around because the process feels collaborative, not just a hand-off at launch.

Key Highlights:

• Certified B Corporation
• Works with charities and universities
• Focuses on accessibility fixes
• Handles site migrations

Services:

• Website development
• App design and build
• Digital strategy
• Software solutions
• UX and accessibility

Contact Information:

• Website: digitalwonderlab.com
• Phone: 01225 220 155
• Email: hello@digitalwonderlab.com
• LinkedIn: www.linkedin.com/company/digitalwonderlab
• Instagram: www.instagram.com/digitalwonderlab

 

10. Spinbox

Spinbox runs projects through short cycles, checking progress and tweaking as needed. Developers there connect websites to back-office systems, pulling in data to guide design choices. Umbraco fits into many builds, especially when personalization or testing comes into play.

The agency uses A/B tests to see what actually works for users, not just what looks nice. Automation ties into CRM tools, cutting down manual work once everything clicks into place. Spinbox keeps clients in regular updates so surprises stay minimal.

Key Highlights:

• Based in Milton Keynes
• Microsoft tech stack focus
• Runs A/B and MVT tests
• Uses DSDM principles

Services:

• Umbraco development
• Web design and build
• Application modernization
• Cloud migration
• Digital consultancy

Contact Information:

• Website: www.spinbox.co.uk
• Phone: +44 (0)1908 592595
• Address: 5 & 6 Walker Avenue Milton Keynes MK12 5TW United Kingdom
• LinkedIn: www.linkedin.com/company/spinbox-digital
• Facebook: www.facebook.com/Spinbox
• Twitter: x.com/SpinboxDigital

 

11. Crafted

Crafted mixes marketing know-how with development to push sites past basic setup. Developers there build on platforms that let content shift based on visitor data. The agency started small and grew by keeping decisions independent, which means advice fits the client, not a corporate script.

Work often spans strategy sessions to final tweaks, with referrals bringing in new jobs. Crafted connects with other specialists when a project needs extra hands outside core skills. The setup keeps everyone moving at the same pace, from planners to coders.

Key Highlights:

• Independent agency
• Combines marketing and dev
• Handles referrals often
• Partners with other firms

Services:

• Digital marketing
• Website development
• Strategy and planning
• Design and UX
• Content personalization

Contact Information:

• Website: www.crafted.co.uk
• Phone: 01473213222
• Email: hello@crafted.co.uk
• Address: Hyde Park House, Crown Street, Ipswich, Suffolk IP1 3LG
• LinkedIn: www.linkedin.com/company/crafted-media
• Twitter: x.com/craftedmedia
• Instagram: www.instagram.com/crafted

 

12. Novicell

Novicell operates as a digital consultancy with offices across Europe, including Aarhus and Copenhagen. Developers there advise on tech choices without tying clients to one stack, covering everything from business strategy to marketing setups. Projects blend practical know-how with a focus on what actually moves the needle for the company.

The consultancy handles cross-border work, keeping communication straightforward. Novicell digs into industry specifics so solutions fit the real day-to-day operations. Clients get input based on facts, not guesses, which helps keep expectations grounded.

Key Highlights:

• Technology-independent advice
• Full-service digital support
• Offices in Denmark
• Works across borders

Services:

• Digital strategy
• Software development
• Marketing consultancy
• Website builds
• Business development

Contact Information:

• Website: www.novicell.com
• Phone: +44 (0)20 8144 8142
• Address: 1-33 Great Eastern Street EC2A 3EJ London
• Email: hello@novicell.com
• LinkedIn: www.linkedin.com/company/novicell-uk
• Facebook: www.facebook.com/novicelluk
• Twitter: x.com/NovicellUK
• Instagram: www.instagram.com/novicelluk

 

13. CSI Media

CSI Media started small in Cheshire and grew by building custom sites and software for travel brands at first. Developers there now handle CMS platforms like Umbraco, crafting portals and e-commerce setups that fit exact needs. The agency keeps a tight crew, which means everyone knows the projects inside out.

Work often mixes design with solid backend integrations. CSI Media partners with tech providers to stay current on tools. Clients end up with systems that plug into existing operations without a lot of rework down the line.

Key Highlights:

• Based in Cheshire
• Umbraco Platinum Partner
• Started with travel tech
• Contentful and Shopify partner

Services:

• Umbraco development
• Bespoke software
• E-commerce platforms
• Website design
• Mobile apps

Contact Information:

• Website: www.csimedia.net
• Phone: +441270617462
• Address: CSI Media, 4 Mallard Ct, Mallard Way, Crewe CW1 6ZQ UK
• LinkedIn: www.linkedin.com/company/csi-media
• Facebook: www.facebook.com/csimediauk
• Twitter: x.com/csimedia

 

14. ClerksWell

ClerksWell runs offices in London and Derby, with extra support from locations in India. Developers there specialize in Umbraco alongside Sitecore and Optimizely, helping pick the right CMS for each job. Projects cover full builds or smaller custom tweaks, always starting with solid business analysis to nail down what needs doing.

Security stays front and center, backed by ISO 27001 practices. ClerksWell handles migrations, e-commerce setups, and ongoing support packages. Accessibility audits round out the mix, making sure sites work for everyone without extra hassle.

Key Highlights:

• Microsoft Gold Partner
• Offices in London and Derby
• ISO 27001 certified
• Supports India-based operations

Services:

• Umbraco development
• Sitecore and Optimizely builds
• E-commerce integration
• System migration
• Accessibility audits
• Support and maintenance

Contact Information:

• Website: www.clerkswell.com
• Phone: 020 7689 8800
• Email: hello@clerkswell.com
• Address: The Print Rooms, 164-180 Union Street, London, SE1 0LH, United Kingdom
• LinkedIn: www.linkedin.com/company/clerkswell
• Twitter: x.com/ClerksWell_Ltd
• Instagram: www.instagram.com/clerkswell_digital

 

15. i3 Digital

i3 Digital operates from Belfast, London, Dublin, and Washington DC, focusing on integrated web apps. Developers there build Umbraco solutions that tie into larger enterprise systems, keeping everything secure and scalable. User experience drives the design work, with research shaping layouts and flows.

The agency rescues tricky Kentico projects and handles hosting in its own data centers. i3 Digital offers round-the-clock support and SEO tweaks alongside core builds. Straight talk and thorough testing keep deliveries reliable.

Key Highlights:

• Offices across UK, Ireland, and USA
• Kentico Quality Expert
• Own data center hosting
• ISTQB certified testing

Services:

• Umbraco development
• Enterprise CMS and DXP
• E-commerce solutions
• System integration
• SEO services
• 24/7 support

Contact Information:

• Website: i3digital.com
• Phone: +44 (0) 207 459 4313
• Email: london@i3digital.com
• Address: 3 Lower Thames Street London
• LinkedIn: www.linkedin.com/company/we-are-i3
• Facebook: www.facebook.com/wearei3
• Twitter: x.com/wearei3
• Instagram: www.instagram.com/wearei3

 

16. Fifteen Design

Fifteen Design runs out of Nottingham with extra account handlers in London and Cambridge. Developers there build sites that mix solid UX with measurable outcomes, pulling in SEO and PPC to drive traffic. Projects often start with competitor checks and user data to shape what actually works on the page.

The agency handles full digital marketing alongside builds, tracking clicks and conversions to tweak things later. Fifteen Design keeps clients in the loop with clear updates, treating each job like an extension of the in-house setup. Maintenance and hosting round out the package so nothing falls through the cracks.

Key Highlights:

• Based in Nottingham
• Covers SEO and PPC
• Tracks user data for tweaks
• Offers hosting packages

Services:

• Website design
• Custom development
• Digital marketing
• SEO and social media
• Brand strategy
• Graphic design

Contact Information:

• Website: www.fifteendesign.co.uk
• Phone: 0203 903 2049
• Email: london@fifteen.co.uk
• Address: 81 Rivington Street, Shoreditch, London, EC2A 3AY
• LinkedIn: www.linkedin.com/company/fifteen-design
• Facebook: www.facebook.com/FifteenDesign
• Twitter: x.com/fifteenagency
• Instagram: www.instagram.com/fifteenagency

 

17. Kayo Digital

Kayo Digital acts as a partner for companies pushing growth through tech. Developers there dig into client operations and user habits to craft sites and software that fit real needs. Work spans NHS portals to council platforms, always with an eye on practical fixes over flashy extras.

The agency runs research first, then builds and maintains what comes out of it. Kayo Digital blends marketing campaigns with the tech side so everything feeds into the same goals. Clients get straightforward input that keeps projects moving without detours.

Key Highlights:

• Works with NHS and councils
• Uses research-driven process
• Handles ongoing maintenance
• Ties in marketing efforts

Services:

• Website builds
• Custom software
• Digital marketing
• User research
• Strategy planning

Contact Information:

• Website: kayo.digital
• Phone: 01795 255 600
• Email: hello@kayo.digital
• Address: The Innovation Building, Kent Science Park, Sittingbourne, Kent. ME9 8HL
• LinkedIn: www.linkedin.com/company/kayo-digital
• Facebook: www.facebook.com/wearekayodigital
• Twitter: x.com/kayo_digital
• Instagram: www.instagram.com/kayo.digital

Conclusion

Picking the right Umbraco partner in the UK comes down to fit-how well the crew grasps your goals, handles the tech without drama, and sticks around when things need tweaking. The agencies out there run the gamut from boutique shops that know every line of code to bigger outfits juggling cloud setups and AI hooks. What ties them together is a knack for turning .NET flexibility into sites that just work, whether you're after a quick content refresh or a full-blown portal.

At the end of the day, chat with a few, see who asks the smart questions, and trust the ones who’ve delivered before. A solid Umbraco build should feel like an extension of your operation-not a science project. Get the basics right, keep the communication open, and you’ll end up with something that grows with you, not against you.