Under the concept of sustainability the building rules have evolved, defining ways to build an energy-efficient cities, beyond the concept of building individually sustainable, and preserving the history, culture and landscape beauty contained in each country. These principles were applied to the City of Sestri Levante, near Genoa, that spread along the coast in a only flat stretch, enriched by an old town full of buildings of considerable merit. The aim of our work was to find the right balance between inclusion in the urban context of the most innovative technologies available in the energy field and protecting the architecture of the place, starting from the identification of applicable techniques of bio-architecture and use of common renewable sources.