Professional papers of Ywain Goronwy ap Griffith comprising agreements, specifications, plans and correspondence, 1927-53, mainly relating to the alteration, repair and erection of new buildings, both private and public, in Merionethshire, Montgomeryshire and Caernarfonshire; files relating to work done in the diocese of Bangor, mainly in the form of alterations and repairs to vicarages, 1932-1952; and papers, 1920-40, relating to the redemption of tithe rent-charges in various parishes of Anglesey, Caernarfonshire, Cardiganshire and Merionethshire.

The series comprises the entries of the six practices which had reached the final round of the competition in October 1998 and previous work done by them. The architects' presentations include photographs of models of their designs, adjudication by Ian Ritchie, and a cost summary.