What is affordable housing UK

It is socially rented - provided to eligible families incapable of acquiring through the market. The eligibility is determined by income and local home prices. As per the definition of charity Shelter such places should not cost more than 35 percent of the income after the tax and other benefits. In the last decade, the government measured it as 25% of the gross income. On the other hand, the place having rent many times the median gross annual salary is considered unaffordable.