St Theodore's was located in Bryncethin, in a rectangular churchyard at the junction of what were then the roads from Blackmill and Abergarw, in an area now entirely redeveloped. It was built in the period 1891-6 to designs of Bruton & Williams, architects, of Cardiff. The original plans suggest a simple lay out of nave and chancel, aisled on the north and with a porch on the south. It ceased to be a place of worship at the end of 1992 and was subsequently sold. The church was later demolished and is now the site of residential buildings ('Y Bracty'). No further details.
Sources: churchplansonline.org; https://www.thegazette.co.uk/London/issue/53677/page/7615/data.pdf

David Leighton, RCAHMW, 28 November 2014