Some designs by Stannus for foundry work were selected for the Exhibition of 1862, and an "Essay on the History of Founding in Brass, Copper, and Bronze" won him in 1881 the freedom and livery of the Founders' Company, of which he became in 1907 sub-warden.
After bringing to a close Stevens's work on the Wellington monument, he was engaged simultaneously with Frederic Leighton and Edward Poynter in the preparation of a design for the decoration of the cupola of St Paul's Cathedral, which was not carried out.
[1] Stannus's executed work consisted chiefly of structural or decorative alterations to existing buildings such as the Cutlers' Hall, the Sheffield United Gas Light Company Offices, the unitarian church, and the Channing Hall at Sheffield, the residences of Sir Edwin Durning-Lawrence at Ascot and at Carlton House Terrace, the Phoenix brewery at Bedford, a house for Mr Faber, M.P., at Beckenham, and Norman Macleod's church in Edinburgh.
He designed the Sunday School centenary memorial at Essex church (unitarian), Notting Hill, and his own house, The Cottage, Hindhead, Surrey.
When in 1903 it was decided further to complete the Wellington monument by the addition of the equestrian statue of the duke, Stannus, whose forethought had preserved Stevens's plaster model for the figure, was able to lay before the authorities several important drawings and other evidences of the original designer's intentions.
[1] His energies were mainly absorbed from the age of forty to sixty in the work of a teacher and lecturer, to which he brought exceptional powers of analysis and great lucidity of expression.
[1] Apart from the work on Stevens, Stannus's publications, which were largely based on his lectures, were:[1] He also revised for the 3rd (English) edition Franz Sales Meyer's Handbook of Ornament, and assisted James Fergusson in some of the illustrations for his books.