The Sogu Public Building Construction Company began its work with the building of Kim Il Sung University soon after the country's liberation from the Japanese colonial rule.

During the periods of the Fatherland Liberation War (1950-1953) and postwar reconstruction, it played a big role in building several big projects like Moranbong Theatre, Kim Il Sung Stadium and Pyongyang Railway Station.

In the days of the great Chollima upsurge, the company successfully carried into practice the policy of the Workers' Party of Korea on prefabricating apartment houses, thus making an innovation of assembling a flat only in 14 minutes.

In the 1970s, 1980s and 1990s, it took part in building Pyongyang Indoor Stadium, People's Palace of Culture and International Friendship Exhibition House as well as Munsu, An Sang Thaek, Kwangbok and Thongil streets.

The Namgu Housing Construction Company, too, played an important role in building scores of projects in the city, including the Mangyongdae Chicken Farm, Phyongchon District People's Hospital, Pyongyang Shoes Factory and other public and dwelling buildings.

In the period of the Arduous March, the forced march, when the country was in hard time, it successfully finished more than 30 projects, including the updating of the Ryongsong Chicken Farm.

The two companies are considered powerful builders in the city.