Umbraco Extension Template

This is the official .NET template for scaffolding Umbraco backoffice extensions with TypeScript, Vite, and proper folder structure baked in. You run `dotnet new umbraco-extension -n MyExtension`, optionally add `-ex` for example code including API controllers and dashboard components, then `npm run watch` to start developing. The template handles all the boilerplate so you can jump straight into building sections, dashboards, or custom workspaces. One thing to watch: you must manually add the extension as a project reference to your main Umbraco instance or it won't load, which the skill flags clearly. Solid starting point if you're extending Umbraco's backoffice instead of fighting config.

skills.sh installs: 413
GitHub stars: 27
last updated: Aug 21, 2026

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Install

$ npx -y skills add umbraco/umbraco-cms-backoffice-skills --skill umbraco-extension-template --agent claude-code

Installs into .claude/skills of the current project.

Files

Umbraco Extension Template

What is it?

The Umbraco Extension Template is the official .NET template for creating backoffice extensions. It provides a pre-configured project structure with TypeScript/Vite tooling, proper folder structure, and all essential files needed for extension development. Every Umbraco backoffice extension should start with this template.

Documentation

Always fetch the latest docs before implementing:

Main docs: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/development-flow/umbraco-extension-template
Development Flow: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/development-flow
Foundation: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/foundation

Prerequisites

.NET SDK 10.0 or later
Node.js 24 or later

Workflow

Version guard: Invoke umbraco-version-guard first to confirm the target site's Umbraco major matches the major these skills target. Stop on a mismatch.
Install template (one-time): dotnet new install Umbraco.Templates

SKILL.md on GitHub