The Polytechnic Institution was opened in August 1838 to provide the public with (in the words of its prospectus of 1837) 'a practical knowledge of the various arts and branches of science connected with Manufactures, Mining Operations, and Rural Economy'. The idea was that of Charles Payne, former manager of the Adelaide Gallery in the Strand. William Mountford Nurse, a builder, provided the initial capital. Sir George Cayley (1773-1857), landowner and aeronautical scientist, became chairman of the provisional committee and later of the directors. His influence helped to raise the necessary share capital. A house at no 5 Cavendish Square was purchased, and a new gallery building (designed by James Thompson) added, with an entrance on Regent Street.
The Institution received its charter of incorporation in 1839. The Gallery housed a large exhibition hall, lecture theatre, and laboratories. Public attractions included exhibitions, working machines and models, scientific lectures, rides in a diving bell - a major attraction - and, from 1839, demonstrations of photography. In 1841 Richard Beard opened the first photographic studio in Europe on the roof of the building.
The Institution became known for its spectacular magic lantern shows, pioneered by Henry Langdon Childe (d 1874), and a new theatre was added in 1848. John Henry Pepper (1821-1900) was appointed lecturer and analytical chemist in that year. He was its most famous showman, also expanding the teaching role of the Polytechnic, which began evening classes in 1856 under the auspices of the Society of Arts. By the 1870s these were formalised under the Polytechnic College. By 1841 the Institution was calling itself the Royal Polytechnic, probably due to the patronage of Prince Albert.
Expansion gradually gave way to financial difficulty, reflecting a long-standing tension between education and the need for profit. A fatal accident on the premises in 1859 caused the first company to be wound up and a new one formed. Various regeneration schemes were considered, but in 1879 a fire damaged the roof, precipitating the final crisis. By 1881 the Royal Polytechnic Institution had failed, the assets sold at auction and the building (no 309 Regent Street) put up for sale. It was purchased by the philanthropist Quintin Hogg (1845-1903), and the RPI succeeded by his Young Men's Christian Institute (later known at the Regent Street Polytechnic), which opened in 1882. Hogg lived for some years in the house in Cavendish Square.
In 1885 Quintin Hogg (1845-1903), founder of the Polytechnic Young Men's Christian Institute (later Regent Street Polytechnic), announced the founding of a day school there, a response to the fact that so many rooms in its premises at no 309 Regent Street were left empty during the day (much of the teaching and activities taking place in the evenings).
The school opened in 1886 with 130 boys, aiming to provide professional, commercial (including Civil Service) and industrial secondary education at moderate fees. It was run by the Polytechnic President, Director of Education, and Governing Body, with its own Headmaster. It catered for boys aged 7 to 17 and soon had over 500 pupils; there was also, from 1888, a school for girls in Langham Place, which may have survived into the 1930s. Hogg himself undertook some teaching. The school used the Polytechnic sports and laboratory facilities. It pioneered educational trips abroad with a visit to Belgium and Switzerland in 1888. A club, the 'Old Quintinians', was formed in 1891 for former pupils to keep in touch with the Polytechnic after leaving the school, and a supplement added to the Polytechnic's magazine for them.
The school was known variously as the Polytechnic (Boys') Day School, the Polytechnic Middle Class School, and the Polytechnic Intermediate Day School. Due to growing numbers of students, the Technical School (originally the Industrial Division) and Commercial School (which included the Professional Division) were divided in 1892. They came to operate largely as separate schools, despite occupying the same building. 'Aided' status under the London County Council was attained in 1911. The Commercial Day School and the Technical Day School were reunited as the Polytechnic Secondary School in 1919. Conditions in Regent Street were cramped owing to the expansion of the adult Polytechnic.
The school was evacuated to Minehead in 1939. On the return to London it was again apparent that the Regent Street Polytechnic building was overcrowded and lacked facilities such as a playground. A proposed alternative site near Regent's Park was bombed, and other proposals also proved abortive. Boys who had returned to London were taught in St Katherine's House, Albany Street, and additional space was found at the LCC Institute for Distributive Trades in Charing Cross Road. Most of the classrooms in Regent Street were in use by the Polytechnic, although some school laboratories remained in the Great Portland Street extension (Little Titchfield Street). This accommodation was unsuitable for the bulk of the pupils returning from evacuation in 1945 and the Pulteney School (originally an elementary board school, founded in 1881) in Peter Street, Soho, provided further premises.
Under the Education Act (1944) fees were abolished. The school moved from aided status to become a voluntary controlled school, under closer control by the London County Council. Renamed the Quintin School in 1948, when it became a grammar school and instituted its own governing body, the school continued to operate on the split sites until 1956, when it moved to new accommodation in St John's Wood, designed by Edward D Mills & Partners and opened in 1957, neighbouring the newly-relocated Kynaston Technical School (formerly Paddington Secondary Technical School). The two schools merged in 1969 to form Quintin Kynaston School, a boys' comprehensive, which became co-educational in 1976.
In 2001 the school became a Specialist Technology College and in November 2011, it became an academy, changing its name to Quintin Kynaston Community Academy.