You can wonderfully play with the differences in elevation. The first reflex is, of course, to shape the terrain so that you can plan and build "two-dimensionally." Here are a few incomplete lines of thought: 1. How can you achieve that both residential floors have ground-level access to the garden? (Example of capturing non-standard opportunities of a hillside terrain) 2. Which paths do I walk, and how important are they respectively? (Assess the importance of the paths from the garage) 3. Where will we as a family particularly like to spend time? (Define the living center - what is it? Cooking, eating, living, terrace...) 4. Where will the children play, and how can they pass by the adults' vehicles "accident-free" with their own vehicles? (Preserve family peace: You seem to care about the cars. Therefore, plan space for your children's paths to prevent damage and avoid wearing yourself out on them.) 5. Where is privacy important to me and in what way? (Visibility, noise level...) Plan with an architect who is truly eager about the task. They will get the most out of the property for you. Thinking three-dimensionally about building a house as a layperson is overwhelming.