 Robertson was an early exponent of the Norman Revival, designing both St Clement's Church, Oxford and St Swithun's parish church in Kennington, Berkshire (now in Oxfordshire) in this style as early as 1828.Robertson then moved to Ireland, where he had considerable success and carried out commissions for notable country houses particularly in the southeastern part of the country.His work was in both the Neoclassical style and then in the Gothic Revival style of the 1830s with which he may be most associated.