Public housing in Singapore is managed by the Housing and Development Board (HDB) under temporary leaseholds for 99 years only. The majority of the residential housing developments in Singapore are publicly governed and developed. As 31 March 2015, 82% of the resident population live in such lease accommodation, drop from the 87% peak in 1988–1990. These flats are located in housing estates, which are self-contained satellite towns with schools, supermarkets, clinics, hawker centres, and sports and recreational facilities.
There are a large variety of flat types and layouts which cater to various housing budgets. HDB flats were built primarily to provide affordable housing for the poor and their purchase can be financially aided by the Central Provident Fund. Due to changing demands, there were more up-market public housing developments in recent years.
Since the founding of modern Singapore, housing in the fledging colony has been concentrated in the city centre, where the early town plans has stipulated ethnic-based districts built on both sides of the Singapore River. Housing in the city was primarily in the form of shophouses where multiple families would live in confined spaces. Housing in the suburban areas were often in the form of either traditional Malay (and occasionally Chinese) villages (Kampongs) or large estates and mansions owned by the Europeans or richer locals.
By the 1920s, chronic housing conditions in downtown Singapore prompted the British colonial government to establish the Singapore Improvement Trust in 1927 to build affordable public housing for the common population of Singapore. The first forms of mass-built public housing thus appeared in Singapore. Still, the SIT managed to build only 23,000 housing units in its 32 years of existence, and was unable to resolve the worsening housing shortage problem.
Low construction rates and massive damage from World War II further exacerbated the housing shortage. In 1947, the British Housing Committee Report noted Singapore had "one of the world's worst slums – 'a disgrace to a civilised community'" and the average person per building density was 18.2 by 1947 and high-rise buildings were uncommon. In 1959, the problem of shortage still remained a serious problem. An HDB paper estimated that in 1966, 300,000 people lived in squatter settlements in the suburbs and 250,000 lived in squalid shophouses in the Central Area.