Tidmarsh is a village 5 miles west of the centre of Reading, in the valley of the river Pang. It is built around a crossroads on the A340 road from Pangbourne to Theale, and the church stands on the main road. It consists of a single nave with 13thc. polygonal apse and timber W bell turret with shingled pyramidal roof. Opposed N and S nave doorways, the S richly carved and described below, the N later, not included and now enclosed in a vestry. The arcaded font is also included.

Tidmarsh is not mentioned in the Domesday Survey and indeed the earliest mention of the manor is in 1239 when it was the subject of a dispute between John of Tidmarsh and his half-sister Juliane de Bendenges, wife of Adam son of Hervey. It is presumed (VCH 1923, 433) to have belonged to Hugh de Tidmarsh at the end of the 12thc: certainly his son John died in possession of 2 carucates of land there before 1222.

The advowson of the church was granted before 1239 by Geoffrey de Tidmarsh to Juliane and her husband Adam, but was back in the Tidmarsh family by 1305. The church is now in the parish of Pangbourne with Tidmarsh and Sulham.

There is a font of almost identical design at Welford (Berks).