A starter kit for a Umbraco website can be beneficial for several reasons, particularly if you are new to Umbraco or web development in general. Here are some reasons why you might need a starter kit:

1. Faster development: Starter kits come with pre-built templates, components, and features that can speed up the development process. You won't have to start from scratch, and you can focus on customizing the website according to your needs.

2. Best practices: A well-designed starter kit follows best practices in terms of coding standards, performance optimization, and accessibility. This helps ensure that your website is built on a solid foundation and adheres to industry standards.

3. Learning resource: If you're new to Umbraco, a starter kit can serve as an excellent learning resource. By exploring the code and structure of the starter kit, you can gain a better understanding of how Umbraco works and how to develop your own custom components and features.

4. Responsive design: Many starter kits come with a responsive design built-in, which means your website will be optimized for various screen sizes and devices. This is essential for modern websites, as a large portion of web traffic comes from mobile devices.

5. Consistency and maintainability: Using a starter kit can help maintain consistency across your website in terms of design, layout, and code structure. This can make it easier to manage and maintain your website in the long run.

Remember that using a starter kit is not mandatory for building a Umbraco website, but it can be a helpful tool, especially for beginners or those looking to streamline their development process.