 Jänes is the architect of the Pirita Olympic Sports Center (1975–1980, with Henno Sepmann, Ants Raid and Himm Looveer, 1980; USSR Prize 1981 and the International Architects' Union (UIA) Biennial Interarch 83)

According to his design of him, the Mustamäe Municipality Center was built in Tallinn (1963–1970, also known as the "Kännu Kukk" restaurant).Among other things, he was one of the architects of the reconstruction of the Estonian Theater.In addition, there are several private houses and garden houses.