Balthazar Lange was selected as the line's main architect, although some minor buildings were standardized designs by Peter Andreas Blix. Lange worked on the various plans from late 1879 until July 1882, when he retired as a railway architect. He first designed three similar, town stations: Holmestrand, Sandefjord and Porsgrunn. Designed in Swiss chalet style, they each featured gablets in each end, on both the track and town side. The ends were more anonymous. The design gave a non-symmetrical feel around the end axis, with the town side appearing in two stories and the track side as one and a half. Holmestrand and Sandefjord have both been extensively rebuilt. The stations were smaller and cheaper with resemblance of Blix' contemporary Moss Station and Fredrikstad Station on the Østfold Line, across the fjord.