Llanstephan is centred around the isolated Church of St Stephen (or Ystyffan). Llanstephan is first recorded as Llanytyffaen wen in the 15th century, with the 'wen' probably referring to the whitewash of the church. The church appears to date from the 13th or 14th century, with a two-and-half stage tower. The building was re-roofed and repaired in 1867-8 and was described in 1859 as not in good condition.
Llanstephan House was demolished in 1972 and subsequently rebuilt. It was originally a tall, three-gabled house dating from mid 1800s which had been remodelled in the 1920s. Other buildings of note include two early cruck frame houses: Dolwen is a few hundred yards south east of the church and has a Tudor door; Celyn, a mile north east, is now ruined but was originally a long house.
- Haslam, Richard (1979), The Buildings of Wales: Powys, University of Wales Press, p. 255, ISBN 978-0300185089
- "Llanstephan" (PDF). Clwyd Powys Archaeological Trust. Retrieved 12 December 2016.
- "Llansteffan Radnorshire". A Vision of Britain. Retrieved 12 December 2016. - quoting John Marius Wilson's Imperial Gazetteer of England and Wales.
- "Llanstephan House, Llanstephan, Near Erwood". Coflein.gov.uk. Retrieved 12 December 2016.
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