The Church is described in Archdeacon Thomas' History of the Diocese of St. Asaph as "The Mission Room, All Saints, Sinan".

It was built at a cost of £215 on a site granted by Mr. H R Hughes of Kinmel, and was opened on All Saints Day, 1873.

It has been suggested that the building was originally intended as a school, but on a map dated 1876, it is clearly designated as ALL SAINTS CHURCH. The map also names the field opposite the Church as Sinan, which explains the basis for the name of the Church.

The building is of stone with a brick "inner lining" and there is evidence on the east wall of a fireplace which has since been filled in. This was probably the original method of heating the building and was replaced at some point by a Coke Boiler located in an "Out House", with water pipes heating the Church. This method of heating was eventually superceded by Electric Heaters.

The derelict "Out House" being recently converted into a Vestry, the building of which is described in the Recent Development section.

The interior of the Church was originally furnished with full length pews, with an aisle running down the left hand side. A Sanctuary Screen was also a prominent feature.