Public housing in the United Kingdom, also known as council estates, council housing, or social housing, provided the majority of rented accommodation until 2011 when the number of households in private rental housing surpassed the number in social housing. Houses and flats built for public or social housing use are built by or for local authorities and known as council houses, though since the 1980s the role of non-profit housing associations became more important and subsequently the term "social housing" became more widely used, as technically council housing only refers to housing owned by a local authority, though the terms are largely used interchangeably. Before 1865, housing for the poor was provided solely by the private sector. Council houses were built on council estates, known