We are faced with a total lack of bibliographic studies on urban popular housing. By contrast, studies on the rural popular house are more widespread. Most of these studies were carried out in the first half of this century, highlighting, for their quality, Baeschlin’s work on ‘The architecture of the Basque hull’, and those of architects Guimon and Muguruza on ‘the Basque huero’ and ‘the rural house in the Basque country’ respectively. None of these works touches on the subject of urban popular housing, and we need to wait for Yrizar’s work on ‘the Basque houses’ in order to see the urban dwellings depicted in that study appear unequivocally. The historian and anthropologist Julio Caro Baroja has subsequently dealt with it in various articles, referring in particular to Navarre.