For most SketchUp models, the unit of measurement is critical to the success of your final project. In SketchUp you can control what units of measurement you'll use for each model you create. Templates When you start a new project in SketchUp the first choice you'll make is which template to use. The template determines the basic unit of measurement. SketchUp comes loaded with a variety of default templates tailored toward the type of project you want to work on. Each project type has different unit of measurement options.