In cities where green space is at a premium and elusive because of building density, roof terraces offer some city dwellers the chance to enjoy a private outdoor retreat. Expand your living space and create a relaxing roof-terrace oasis with lush plants, comfortable lounging areas and a barbecue. Use roof terrace design elements that fit your style and the way you’ll use your roof terrace. You can also choose a roof terrace design that suit your location, need and style. After all, building a roof terrace requires good design, planning and research.