The first foundry was built near the farm of Wøyen, further downriver from today's Bærums Verk, and then another one at Gommerud, closer.

[1] The crown ran the works until 1624 when Det Norske Jernkompani took over and mismanaged to the point that the foundry was shut down in 1641, after a flood had damaged much of the plant in 1638.

Gabriel Marcelis (the elder), a Dutch merchant with close ties to the Danish crown, took over operations in 1641 and invested in a double blast furnace that produced nails, iron parts, bullets, and cannonballs.

He rebuilt the blast furnace so it could run also when there was low water flow in Lomma, built a school on the site, and included also the works at Fossum at Lysakerelven in the operations.

[1] The center now known as Bærums Verk is situated on the site of the old foundry, nestled in a narrow valley along the river Lomma.

A museum, featuring ovens produced in the foundry from the 18th century up to 1964, and shops with products handcrafted on site are situated in the old buildings.