SketchUp will empower you to model in 3D, LayOut will improve your documentation for those projects and Style Builder can let you tweak your style in SketchUp. You can use 3D Warehouse for additional content in your models and you can add Extensions from the Extension Warehouse for further functionality. In addition to these features, you may find you have other needs that you can't accomplish directly in SketchUp.
Your architectural and landscape designs can be extended to include energy analysis. Using SketchUp PreDesign you'll be able to identify aspects for consideration based on weather and region.