He was born into the family of architect Viktor Sadlovskyi and Maria Rawska, who came from a family of Lviv architects. He completed secondary school in Lviv. Between 1888 and 1892, he studied at the Lviv Polytechnic, then attended the Vienna Polytechnic from 1892 to 1894. Later, from 1894 to 1896, he worked as an assistant in the class of manual and ornamental drawing under Otto Gruber. He explored the architectural styles of Vienna and Lower Austria. In 1897, he earned an engineering diploma in Lviv. On January 1, 1900, he became a member of the Polytechnic Society in Lviv, serving in various roles, and from 1903 to 1904, he was the society’s deputy secretary. In 1910, several of his projects were exhibited at an architectural exhibition in Lviv. He taught drawing at the State Industrial School in Lviv from 1899 to 1911 and then at Lviv Polytechnic, where he was a professor and head of the drawing department until 1934 (from 1919 as a full professor). From 1916 to 1918, he served as dean of the architecture faculty.
He designed numerous Art Nouveau buildings in and outside of Lviv and also created interior designs and everyday items. His architectural work was influenced by Otto Wagner’s ideas.