Brandasund probably got its name from one of the first merchants granted permission to trade here, Jakob Brandt. The first record of a village shop in Brandaberg is from 1667. An older name for the settlement is Gisøsund. There was also a transit station at the traveller's Inn. The person responsible for transporting people from one place of trade to the next lived nearby and made his living doing this.
The fishing trade out here in these productive fishing grounds probably has its roots far back in time, but when it became a trading post with royal privileges, the shopkeeper took over the trade. In 1723 it was said: "At this place or island a shopkeeper's licence is granted, and is also required for the peasantry to sell their fish here". The tradesman also ran a salt works and barrel-making trade, in addition to a fish landing. There is still an active community here: The main building is from the beginning of the 1800s. A "Moses-loft" (storage house) from the 1700s, worker's lodging, bakery, baker's lodging, boarding house, storage shed, wood shed, forge, store, fish shop, boathouse, and a little farther north: two large boat houses, a grain barn and a salting barn.