The main idea and concept of this project is to offer Hotel Rocher Noir and it’s guests a great Sea View. The programme optimization is particularly designed to improve the square meters, while taking into account Algeria’s cultural identity. Sustainability is also an important issue, as we try to use the Rain water harvesting to achieve 30% reduction of water demand, drinking artifacts as well as 100% reduction of potable water consumption. Another important point is about the building materials with low emissions and low volatile organic compounds (VOCs). Preferring the use of local materials and the prevision of using recycled materials. The entire building works like a big chimney which helps to cool the expulsion of hot air spaces, and provokes the natural renewal of air through the central courtyard. Moreover The energy-efficient façade is very functional, as it balances the temperature, natural light and transparency. Finally having sun protection for the summer and a sunlight income to help for the colder periods of the year.