Extension to a Listed Building in Llanfihangel Talyllyn Our clients approached us to design an extension to this Grade II listed hall house, situated just outside the Brecon Beacons National Park boundary. They had bought the property forty years ago as a long-term restoration project, and over the years the almost derelict buildings have been sympathetically upgraded. ... read more Posted by crispin.flower Saturday, January 16, 2016 10:21:00 PM Categories: Extension Farmhouse Listed building