English architect. After visiting Greece (from 1814), he published Picturesque Views of the Antiquities of Pola in Istria (1817), and claimed he was the first to spot entasis on the shafts of Greek columns, although C. R. Cockerell and Haller von Hallerstein, whom Allason had met while in Athens, had also observed this. His main work was the Alliance Fire Office, Bartholomew Lane, London (1841—demolished), and he planned and carried out designs for houses on the Ladbroke Estate, Kensington, in a severe, stripped Classical style from 1823: his own house in Linden Gardens (demolished) was illustrated in Loudon's Encyclopaedia of Cottage, Farm, and Villa Architecture (1846), and he designed a studio for the artist William Mulready (1786–1863) at Linden Grove, Bayswater (1827). He oversaw the development of the Pitt Estate, Kensington (from 1844), and was involved in the d'Este Estate, Ramsgate, Kent.
Colvin (1995);Papworth (1852);Sheppard (ed.) (1973)