Who sets the agenda when it comes to designing houses? More often than not wealthy developers call the shots. The result is cheaply-made hot boxes, unaffordable to live in, and poorly designed for human habitation. How did it come to this, and how can citizens and architects seize control? Meet 3 international trailblazers who want to change who controls what we get to call home — including an architect from Barcelona who needed an affordable place to call home and had social change on their mind.