Gregynog Hall is a three storey E-plan house plus attics, with gabled dormers and slate roofs. It is half-timbered in appearance but clad in rendered concrete moulded and painted in black-and-white style. Incorporating early seventeenth century panelling in the dining room from an earlier house, it was rebuilt from about 1840 and by 1872 the house had taken its present form, of brick clad in concrete and painted to imitate the local timber-framed tradition. The Gregynog Estate is notable for the exceptionally early use of concrete to build cottages, farm buildings and bridges. Bequeathed to University of Wales in 1963.
(Source: Cadw listing description, 31 January 1997.)

Gasworks are marked on the 1885 to 1886 OS maps. The Economic Gas Company issued a pamphlet c1881 in which they described their system of manufacturing gas for heating purposes and motive power at the low cost of 1s. per 1,000 feet. This system was reported to be in operation at Gregynog Hall, Lord Sudeley’s seat. The house was sold in 1894 by Lord Joicey, who it would appear removed the gasworks. The gasworks would have been used to light the house. 

Associated with: Park/gardens (Nprn265565).

B.A.Malaws, RCAHMW, 14 May 2007.