1913–6 the development of Castle Hill Hospital began, on the site of the former Cottingham Castle house. the initial buildings were a tuberculosis sanitorium, the hospital was extended westwards between 1921 and 1939 with the addition of an infectious diseases hospital. The large houses Northfields House, and Thwaite House, were acquired by the nascent Hull University in 1928, converted to halls of residence, and renamed Needler Hall and Thwaite Hall respectively. Both Halls were substantially extended in the period after acquisition for university accommodation use. In 1951 the university created another hall of residence, 'Cleminson Hall' on grounds south of Thwaite Hall, the site was expanded for student accommodation in the 1960s. Cleminson Hall was closed in 2003/4, and the site sold, the site was redeveloped into a housing estate between 2009 and 2012. During the Second World War, a temporary camp (Harland Way Camp) was constructed near Cottingham Grange. Initially, it housed refugees, and it later became an army transit camp; the grange itself was used as officers quarters. The house was demolished by the 1950s and the site split between the new Cottingham Secondary school and Hull University. Hull University built the neo-Georgian block of Ferens Hall in 1956/7 on the army camp site, and in 1963 construction of a large modernist pale-brown brick halls of residence, designed by Gillespie, Kidd & Coia known as The Lawns began on the east side of the same site. Cottingham Secondary School (as of 2012 Cottingham High School) opened in 1955, with extension opened in the 1975/8, on the western side of the former Cottingham Grange site. The village became increasingly urbanised in the first half of the 20th century, particularly by terraced housing. Additionally the road to Hull was developed, with housing near continuous along it by the 1950s. During the interwar period the boundaries of Hull were expanded, taking in part of Cottingham; the North Hull Estate was constructed on the north-west fringe of the city in the 1930s, and by mid-century, only a narrow strip of green space separated Hull from Cottingham on its eastern boundary near 'New Village'. In the post-Second World War period, extensive urban development and expansion took place, in particular to the south of the village. In this period most of the development was of detached and semi-detached dwellings, often with front and rear gardens. By the mid-1950s Southwood Hall was surrounded by houses.