Borgestad Church

The church of Vestre Porsgrunn was built by the builder Joen Jacobsen in 1758. In 1777, the interior was rebuilt: the transverse partition was removed and the church was given a barrel vault with painted skies and clouds. In 1830 the church received an extension of the sacristy to the east, and around 1900 the interior was modified: the vault was painted white, the walls were panelled and much of the furniture was replaced. This was changed during the restorations of the 1930s and 1956. In 1995 a new organ was installed in the church, built by Ernst Junker.

The Østre Porsgrunn Church was designed in 2015 by professor-architect Espen Surnevik as chief architect, and Trodahl architects as collaborating architect. The building is often referred to as the "porcelain church", as it was to be clad on the outside with porcelain-like tiles. The new church building was completed in autumn 2019 and was consecrated on 15 September 2019. The modernist church replaces a 1760 church, designed by Laurids de Thurah, which was burnt down to the ground on the night of 11 April 2011.

Gimsøy Church is a long church completed in 1922 by architect Gunnar Norby. The church had an altarpiece painted by Finn Krafft, but in 1972 it was replaced by a stained glass window in the choir apse window.