The church in Warren was probably founded at the end of the 13th century, perhaps on the site of an earlier temple. Soon after, it was leased along with the parish to William Harold of Haroldstone, the local landowner. In the 18th century, the church was in such a bad condition that in 1770 the northern aisle was demolished. In 1855, the situation of the building still did not look good, and therefore the church was thoroughly renovated. At the end of the works, in 1870, a new spire was installed on the tower.
The church initially consisted of a rectangular, single nave, a lower, shorter, also rectangular chancel on the eastern side, and a southern chapel, called the southern transept in English literature. As the northern arm was probably not built, the whole church did not have the shape of a Latin cross. In the fourteenth century, a porch was attached to the southern wall of the nave, and in the fifteenth century, a slender four-sided tower was located from the west. It became the most distinctive element of the building. It was crowned with a parapet mounted on corbels and perhaps already in the Middle Ages with a spire. On the north-west side, it was equipped with a slightly protruding staircase. Originally, there was an additional, late-medieval aisle on the north side.
The church has preserved to this day the perimeter walls of all medieval elements, except for the northern aisle and the more heavily rebuilt chancel. Unfortunately, the windows placed in the church today are mostly the result of a Victorian renovation, as is the 19th-century spire crowning the tower.
Salter M., The old parish churches of South-West Wales, Wolverhampton 2003.
Website coflein.gov.uk, St Mary’s church, Warren.
Website warren-church.org.uk, History of Warren, The Church of St Mary.