Mortimer Lewis

In 1835 Governor Bourke made suggestions within reports of that he had finally discovered an architect competent enough to satisfy his needs within the public works sector. Lewis' discovery to Bourke came at a time when there was desperate need of a Lunatic Asylum which was adequate to deal with problem people within the colony. Lewis began work in 1836 and the Gladesville Asylum opened in 1838. His design had a simple traditional facade, symmetrical in plan and elevation. The Ionic columns of the portico would have been one of the first examples of such ornate craftsmanship within Australia at this time.[5] Previously it was more common to see Doric columns with circular detailing at the capitals, requiring far less detail and craftsmanship than the ornate Ionic columns designed by Lewis.

St John's Anglican Church of Camden, completed in 1849, is regarded as one of the finest examples of Gothic Revival architecture in Australia. The church was constructed from local materials such as stone and clay. The clay is known to produce bricks with a great variation in colour and the St. Johns church is no exception producing pink, russet, red and orange bricks. Lewis had an affinity with stucco at the time of construction and the bricks of the church were laid with the anticipation of a secondary finish which never occurred for unknown reasons. Ironically the roughly laid bricks resulted in a richness in the facade, adding character and depth.

Said to be one of Lewis’ most important works,[5] the "erudite Greek Classic "Darlinghurst Courthouse was commenced in 1835 and completed in 1844. Lewis’ plan placed the court room in the centre, with a symmetrical arrangement of rooms for magistrates and court officials either side. The entry was through a pedimented porch framed with Doric columns, a direct imitation of an ancient Greek temple, except in this instance the Doric columns do not extend to the ground. It is said that the pattern in the sandstone columns was stopped at a height to avoid damage from passing traffic.[5] Darlinghurst Court was the first purposely designed courthouse to be built in NSW, with the general layout and form referenced for buildings of law in Australia for the next 60 years. These included Lewis’s (c. 1837; destr.) Parramatta Courthouse, New South Wales, and the Supreme Court (1847–51; now Magistrates’ Court House), Adelaide, South Australia, by Richard Lambeth. The building was altered in 1886 by James Barnet to include major flanking court room additions. The extension facing Victoria Street, completed in 1963, was designed by the Government Architect's Office.

Lewis acquired land in what was to become the beachside suburb of Bronte, and started work on the sandstone bungalow which became Bronte House. The house was originally built with the intention of housing his family but Lewis was forced to sell mid-construction during the 1840s recession. The partially built property was purchased by Robert Lowe. The four square asymmetrical plan, including a bay and bow window, was typical of Lewis, except the external detailing, such as the romantic circular and hexagonal corner turrets, were assumed to have been altered to suit the new owners’ needs.[6] The building was sited in the substantial gardens of the naturally irregular site. This picturesque style was not commonly found in Australian Colonial architecture and was thought to be a transition, from the simplicity and symmetry of earlier Georgian building types, to a revivalism of the Victorian era.[6] The house, with garden, remains substantially intact and is owned by Waverley Council, which leases it to private tenants. It is open to the public a few times a year.

In 1849, Lewis bought three plots of land behind Macquarie Street, Sydney, facing The Domain. On this plot of land he built his own home, which he called Richmond Villa. It is one of the few examples of Lewis's residential work, since his buildings were generally non-residential. He designed Richmond Villa in a Gothic Revival style, as he had done with Bronte House. The ground floor contained a high verandah with zig-zag lattice-like detailing which contrasted with the building's asymmetrical plan and fenestration. In 1978, the house was dismantled to make way for extensions to Parliament House and was later re-erected in Kent Street, Millers Point.