The Penrhys Estate consisted of 951 homes and was built between 1966-69 to the designs of Alex Robertson, Peter Francis & Partners. Many of these homes were demolished in the 1990s, leaving around 300 refurbished and re-clad properties, owned by RCT Homes (Travllis). 

Sources

Jonathan Vining and Malcolm Parry, Wales 1901-2000, p.21
'The Notorius Penrhys estate: What happens when planners get it wrong', WalesOnline, 10 December 2017

Meilyr Powel, RCAHMW. March 2021.