The castle of Doragno is the result of the transformation and extension of an ancient medieval fortress into a private residence. In a nutshell – Doragno castle Address Via Doragno 1, 6821 Rovio, Switzerland Location 45°56′02″N 8°59′13″E Altitude 497 MAMSL Photo Luciano Carugo Information Building typology Residential Construction type Retrofit Year of construction 2017 Peak power 16.4 kWp Energy production 16,400 kWh/a Building skin application Solar tiles Product Custom made Manufacturer ISSOL Switzeland SA Architect deltaZERO / Stefano De Angelis e Maria Mazza Photovoltaic installer Greenkey Sagl – Kim Bernasconi The Doragno Castle Photo: Luciano Carugo Aerial view Photo: m.fontanasothebysrealty.com Before the retrofit Photo: deltaZERO SA Between old and new Photo: Luciano Carugo Indoor view Photo: Luciano Carugo