--- title: Closed Won - Custom HubSpot development and AI agents description: ost HubSpot partners configure the platform. We build inside it — custom UI extensions, bespoke tools, integrations and AI agents, engineered properly. image: https://www.closedwon.co.uk/hubfs/featured-3.png --- [![CLOSED WON](https://www.closedwon.co.uk/hubfs/Logo_OneLine_Charcoal.svg "CLOSED WON")](https://www.closedwon.co.uk/) [![CLOSED WON](https://www.closedwon.co.uk/hubfs/Logo_OneLine_Charcoal.svg "CLOSED WON")](https://www.closedwon.co.uk/) - Services [HubSpot Transformation](https://www.closedwon.co.uk/hubspot-transformation) [HubSpot Projects](https://www.closedwon.co.uk/projects) [HubSpot Development and AI](https://www.closedwon.co.uk/hubspot-development-ai) [HubSpot Advisory Two hours](https://www.closedwon.co.uk/advisory) - [Reviews](https://www.closedwon.co.uk/reviews) - [Case Studies](https://www.closedwon.co.uk/success) - [About Us](https://www.closedwon.co.uk/about) [Contact Us](https://www.closedwon.co.uk/contact) [Contact Us](https://www.closedwon.co.uk/contact) - Services - [HubSpot Transformation](https://www.closedwon.co.uk/hubspot-transformation) - [HubSpot Projects](https://www.closedwon.co.uk/projects) - [HubSpot Advisory Session](https://www.closedwon.co.uk/advisory) - [Reviews](https://www.closedwon.co.uk/reviews) - [Case Studies](https://www.closedwon.co.uk/success) - [About Us](https://www.closedwon.co.uk/about) Book an Intro Call HubSpot Development and AI # Whatever you need HubSpot to do, we can probably build it Custom features, integrations and AI agents, built properly by people who can actually code, not just configure. # Everything a HubSpot build needs We design and build around the specific gap in your system, not a generic app. ### Custom UI extensions Cards, actions and custom views embedded directly into HubSpot record pages. Custom UI extensions ### Bespoke internal tools Standalone apps and dashboards built on your CRM data for the workflows HubSpot doesn't cover natively. Bespoke internal tools ### Integrations and APIs Connect HubSpot to the rest of your stack properly, not with a fragile no-code patch. Integrations and APIs ### AI agents Agents built on HubSpot's Agent Hub and your own CRM data, for prospecting, service and internal work. AI agents ### Custom automation Coded workflows for logic native automation can't express. Custom automation ### Data pipelines Move and transform data between HubSpot and the rest of your stack reliably. Data pipelines ### Testing and guardrails Every build, AI or otherwise, tested and reviewed before it touches live data. Testing and guardrails ### Handover and training Documentation and training so your team can run and extend what we've built. Handover and training ## Client reviews “They don't just respond to our needs; they anticipate them. The suggestions for streamlining our workflow have been invaluable, making our processes simpler and more efficient.” ![andrea](https://www.closedwon.co.uk/hs-fs/hubfs/andrea.png?width=544&height=544&name=andrea.png) Andrea Struckmeier Marketing Director “We started with zero knowledge - and Adam has really helped take use through step-by-step. He took time to really understand our business and give us a solution that worked for us” ![george](https://www.closedwon.co.uk/hs-fs/hubfs/george.png?width=544&height=544&name=george.png) George Owen Owner “Always available to help, and managed to brilliantly explain to the team how to make the most of HubSpot while solving issues we encountered on the way.” ![ebcportraits4284-400x392](https://www.closedwon.co.uk/hs-fs/hubfs/ebcportraits4284-400x392.jpg?width=400&height=392&name=ebcportraits4284-400x392.jpg) Hugo Hermantin Marketing Director The Framework # Make HubSpot work for business growth From strategy and data to implementation and adoption, we fix the whole system so HubSpot supports how your commercial team sells and grows. ![icon-phase1](https://www.closedwon.co.uk/hubfs/icon-phase1.svg) ### Diagnose Uncover the process, data and technology gaps holding revenue back. ![icon-phase2](https://www.closedwon.co.uk/hubfs/icon-phase2.svg) ### Design Create the strategy, processes and system your commercial teams need. ![icon-phase3](https://www.closedwon.co.uk/hubfs/icon-phase3.svg) ### Deploy Build, clean up and connect everything inside HubSpot. ![icon-phase4](https://www.closedwon.co.uk/hubfs/icon-phase4.svg) ### Drive Embed new ways of working and continuously improve performance. HubSpot ## We cover all hubs ![marketing-1](https://www.closedwon.co.uk/hs-fs/hubfs/marketing-1.png?width=182&height=239&name=marketing-1.png) #### Marketing Hub Turn strangers into leads and automate the journey from first touch to handoff with precision. Marketing Hub ![sales](https://www.closedwon.co.uk/hs-fs/hubfs/sales.png?width=224&height=225&name=sales.png) #### Sales Hub Empower your reps to close more deals with deeper pipeline visibility and frictionless automation. Sales Hub ![ProductIcons\_ServiceHub\_Icon\_Orange](https://www.closedwon.co.uk/hs-fs/hubfs/ProductIcons_ServiceHub_Icon_Orange.png?width=222&height=186&name=ProductIcons_ServiceHub_Icon_Orange.png) #### Service Hub Turn every support ticket into a loyalty-building moment by providing seamless, proactive customer care. Service Hub ![commerce](https://www.closedwon.co.uk/hs-fs/hubfs/commerce.png?width=206&height=213&name=commerce.png) #### Revenue Hub Shorten the path to payment by integrating your billing and quotes directly into your CRM. Revenue Hub ![data](https://www.closedwon.co.uk/hs-fs/hubfs/data.png?width=239&height=208&name=data.png) #### Data Hub Sync your data, clean your records, and automate complex workflows to keep your engine running perfectly. Data Hub ![ProductIcons\_AgentHub\_Icon\_Orange](https://www.closedwon.co.uk/hubfs/ProductIcons_AgentHub_Icon_Orange.svg) #### Agent Hub Build, deploy and manage AI agents powered by your CRM data to generate demand, win deals and serve customers at scale. Agent Hub Let's talk ## Better revenue performance starts with a conversation. Book a call #### About Closed Won Is your HubSpot setup holding revenue back? Probably. ![HubSport Platinum](https://www.closedwon.co.uk/hs-fs/hubfs/29c7d9606_partner.png?width=174&height=174&name=29c7d9606_partner.png) [Main pages](https://www.closedwon.co.uk/advisory) - [HubSpot Transformation](https://www.closedwon.co.uk/hubspot-transformation) - [HubSpot Projects](https://www.closedwon.co.uk/projects) - [HubSpot Advisory](https://www.closedwon.co.uk/advisory) About - [Case Studies](https://www.closedwon.co.uk/success) - [Reviews](https://www.closedwon.co.uk/reviews) - [About Us](https://www.closedwon.co.uk/about) Get in touch - [Contact Us](https://www.closedwon.co.uk/contact) - [Support](mailto:team@closedwon.co.uk) Copyright © 2026 Closed Won Ltd. - [Privacy Policy](https://www.closedwon.co.uk/privacy-policy)| Telephone: [0204 634 6188](tel:02046346188)