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.