Brostugan was originally built in the 1780s and became the residence of the bridge-keeper when Gustavus III had built the first bridge between Kärsön and Drottningholm Palace in 1787. Brostugan served as the house of the bridge-keeper until 1931, whose job was to open the bridge and collects tolls. The upper floors were rented to summer visitors and one of the most famous tenants was Hjalmar Söderberg.