The enlarged pair will work across a number of areas including education, residential, care homes, mixed-use and retail developments as well as public sector work.
Both companies will relocate in January to newly refurbished offices in Buckingham Palace Road, close to Victoria station in central London, and have combined revenues of around £4 million.
Tropus was formed in the 1920s as McBains and only renamed Tropus in the 1990s. Its current projects include mixed-use schemes at Barnsley, Slough, Croyden and Bristol. Spicer Partnership, founded by Ken Spicer in 1954, moved from central London to Bromley, Kent in the 1980s.
Francis McPeake, a director at Trophus and now the new managing director of Tropus & Spicer said: “As a larger organisation we will be able to compete for a wider range of projects." Mr McPeake will be joined by fellow directors Bill Hallett (Spicer), Colin Lee (Spicer), Fred Perfect (Tropus), Martin Plummer (Spicer) and Mike Taylor (Tropus).