In 1972, Matti Heikkinen followed in the footsteps of his father Uki Heikkinen and took charge of the company.

Power plant projects for Pohjolan Voima Oy continued along the western coast, and designing apartment and business buildings was active in Northern Finland. In the 1970s, the firm also profiled itself as designer of different sports arenas. The best-known sports arenas designed by architectural firm Uki Heikkinen include the Oulu ice stadium, completed in 1977, and the Oulu sports hall.

Source: UKI Arkkitehdit, Huomisen tekijät, Niskala & Okkonen, 2009