Gustav Bartholin Hagen

After his return to Denmark, Hagen established a successful practice, specializing in private villas and country houses, including B. Hertz' villa in Vedbæk (1904–08), Lystrupgård at Slangerup (1907) and Broksø at Næstved (1915–16).^[3] Another early work is the new headquarters of the Copenhagen Lighting Service (Københavns Belysningsvæsen) on Gothersgade in Copenhagen. He won the competition in 1909 and subsequently made the final design in collaboration with Rolf Schroeder who had taken 3rd prize.^[4]

Later in his career, he designed a number of schools, most notably Øregaard Gymnasium (1922–24, with Edvard Thomsen).

• Villa BH (for goldsmith Bernhard Hertz), Vedbæk Strandvej 322, Vedbæk (1904–08)
• Lystrupgård main building (1907)
• Villa, Østergade 18, Store Heddinge (1910)
• Københavns Belysningsvæsen, now VUC, 53 Gothersgade/8 Vognmagergade (1912–13, with Rolf Schroeder)
• Store Heddinge watertower, Store Heddinge (1912)
• Sparekassen for Køge og omegn, Køge (1913–14 and 1918–19)
• Warehouse, Enghave Brygge, Copenhagen (1918-1920)
• Sauntegård (1914)
• Broksø (1915–16)
• Olfert Fischer Monument, Reformed Church, Gothersgade, Copenhagen (1920)
• Halskovskolen, Korsør (competition in 1921)
• Øregård Gymnasium, Gersonsvej, Hellerup (1922–24, with Edvard Thomsen, listed)
• Sparekasse, Store Heddinge (1925, extended by the sculptor Mathilius Schack Elo, listed 2003)
• Gentofte Central Library, Øregårds Allé, Hellerup (1929–30, nedrevet)
• Skovshoved Skole extension, Skovshoved (1929–30, with Alfred Brandt)
• Dyssegårdsskolen, Dyssegårdsvej, Dyssegård (1929–33, with Alfred Brandt og Carl Schiøtz)
• Næsbyholm (1932–33)
• Søndermarksskolen, Frederiksberg (1932–33)
• Sønderjyllandsskolen, Frederiksberg (1939–43, with Ole Hagen)
• Damsøbadet, Frederiksberg (1941–43, with Ole Hagen)