Fazl mosque is architecturally significant in that it marks a departure from the high Victorian Orientalism of buildings such as Woking, the Brighton Pavilion and Sezincote House, and presents instead a restrained Islamic language infused with a sense of contemporary 1920s Art Deco. Fazl was therefore a radical and progressive departure that helped mark the end of exotic architectural representations of the ‘East’, and so the end of the Orientalist genre in British architecture.

The exterior of the Fazl Mosque consists of a green dome, with the apex of the dome standing 10m high. The dome rests on a square base, with four cupolas on each corner of the building. The mosque is a blend of classic Mughal architecture and British contemporary styles. The mosque’s use of modern construction and modern materials created a separation from orientalist architecture, a style of architecture seen in other early mosques in London such as the Shah Jahan Mosque. The blend of formal features mixed with contemporary styles led the mosque to be recognized as a grade II listed building.

In “A History of Mosques in Britain,” Saleem Shahed describes the structure “simple and carefully proportioned,” with a 7 x 10 m prayer hall, 5.4 m in height, and capped by dome rising an additional 4.6 m. Shahed notes strong Mughal influence in features of the mosque such as the cupolas in each corner of the prayer hall, but he also argues the mosque is a “British Islamic building influenced by contemporary trends in Modernism and Art Deco.”

The white mosque with its green dome and tall, narrow, arched windows, is surrounded by grass and ornamental vegetation. It is the centrepiece of a complex that includes multipurpose assembly spaces, offices, and apartments.