A coastal farm like Kaldslett was dependent on making a living from both land and sea. The boathouse was large enough to store an "åttring" (an 11-12 m long wooden boat with 4-5 pairs of oars and, typically, a square sail). A bank of rocks was built to create a sheltered landing place where boats could be pulled up on dry land in front of the boathouse. The people at Kaldslett also had a vessel which for many years was sent on hunting expeditions in the Arctic Ocean.
The boathouse is a log construction but some of the side walls are filled in with vertical planks. When the new road was built around 1980, the boathouse was repositioned and repaired.