Is it necessary to build more than 2,000 million new homes in the world in the next 80 years due to population growth and changes in the average size of households? Does Spain need more than a million affordable rental buildings to solve the problem of access to housing? According to the latest estimate from the INE, in 2011 we already had 3.4 million empty homes.

In this article in Ecoavant, the architect and professor at the Universidad de Castilla-La Mancha Francisco Javier Castilla analyzes the challenge of making better and more sustainable use of the current housing stock.