Services were held alternately in Hälleviksstrand and Morlanda, which meant that the residents of Flatön had difficulty reaching church during winter and in bad weather. In 1912 a meeting was held and it was decided to collect funds for building a church. However, it took several years before the church was completed. On 14 August 1928 the church was consecrated by provost Rehnberg and 12 assisting clergy. The church was designed by the architect Sigfrid Ericson (who had also designed Masthuggskyrkan, the Art Museum and the Art Gallery in Gothenburg). At this time the Functionalist style had arrived, and Flatö kyrka is a clear example of this. It is light, simple and purpose-built, and the nave has fine acoustics. The church stands today in almost its original condition. Only one small alteration has been made, to create more space in the chancel. The church is not used today during the winter half of the year, except for baptisms, weddings and funerals.
Altarpiece
Sigfrid Ericson also designed the altarpiece, which consists of a painting surrounded by wooden figures symbolising faith, hope and love. The figures were made by Fritiof Richter and painted by Joël Mila, who was also responsible for the colour scheme in the rest of the church. The central painting was made by Olle Skogman and depicts Jesus walking on the water and saving Peter.
Organ
For the consecration in 1928 a reed organ (orgelharmonium) was purchased from Östlind och Almqvist. It still stands on the gallery and is used on certain occasions.
In the 1960s a pipe organ was purchased, which unfortunately turned out to be too small for the church. It was therefore sold to Nösunds kapell.
In 1987 the pipe organ was replaced with a Grönlund organ from 1958. It was sold by Sjömansinstitutet in Stockholm and has 11 stops.
Font
The font was made by Lars Jansson and was donated by Flatöns kyrkliga syförening (the local church needlework society).
Other decoration and furnishings have been acquired through collected funds and gifts.
Church opening hours: In the summer of 2020 the church was open 4 July – 9 August, every day, 13:00–16:00; the key could be collected at the museum. The church is sometimes in use for other purposes; please be considerate.