 In June 1886 he was elected to the New South Wales Legislative Assembly to succeed the former NSW premier Sir John Robertson KCMG as one of the members for Mudgee.In 1894 Wall transferred to Rylstone and in July 1895 he lost the Rylstone seat.William Chandos Wall was a 'liberal' Protectionist member in the NSW Parliaments from the 12th to the 16th inclusive (under the Jennings, Parkes, Dibbs and Reid Governments).