The advance of late Victorian urbanisation during the last twenty years of the 19th century swept away the 18th and early 19th-century houses, their grounds and the farmland. By 1900 Harringay was completely urbanised.
From 1894, Harringay was spread across the borders of the former urban districts, later municipal boroughs, of Hornsey and Tottenham in Middlesex.
Following the Second World War, Harringay began to change as immigration began to impact the nature of the town. In 1965 it was unified under one local authority with the creation of the London Borough of Haringey.
The earliest development in West Harringay followed the development of Finsbury Park and the construction of Endymion Road, which was started in about 1875 by the Metropolitan Board of Works. A small area of land between the Tottenham & Hampstead Junction Railway, Finsbury Park and Endymion Road was laid out as streets and fully developed by 1885.
Before this development was complete, the British Land Company purchased most of the Harringay Park Estate in June 1881. It was bought from a Mr Hodgson who had acquired the land in 1880 from the executors of Edward Chapman, the last owner of Harringay House and grounds. Also in 1881 the Great Northern Railway Company purchased a large slice of land, about half a mile long by 800 feet wide, at its broadest. The land, which ran along the western boundary of the estate, was used to construct a large railway sidings.
Having acquired the land, the British Land Company was responsible for most of the development of West Harringay. Originally established as part of the land reform movement, by the time the company was involved in Harringay's development it was operating as a purely commercial land company. Its role in Harringay was with the preliminaries of estate development - laying out the estate, building the roads and supplying major services. Once this was complete it auctioned off the land to builders.