Affordable housing is defined as any housing that meets some form of affordability criterion. The affordability criterion is different for different countries.  For example in United States and Canada, a common accepted criterion for affordable housing is that the cost of housing should not be more than 30 percent of a household’s gross income. Housing costs include taxes and insurance for owners, and utility costs. The Confederation of Real Estate Developers’ Associations of India (CREDAI) has developed definitions of affordable housing for Tier I, II and III cities, based on three key parameters-income level, size of the dwelling unit, and affordability.