The processes of industrialization marked strong transformations that led to a new way of functioning of the city of Barcelona and a new organization of the territory and society, despite the defeat of 1714 and the New Plant Decree that turned it into a military plaza surrounded by walls and fortresses that drowned its possible growth. Barcelona was the focus of the Industrial Revolution in Spain. This was part of a process of reconstruction of the city, since almost a third of its surface was used for the construction of the Citadel, with demolition of houses and re-installation of population, while rebuilding the houses affected by the bombings.
The liberalization of commerce between the metropolis and the colonies allowed Barcelona to trade with the Caribbean islands, enabling a commercial flow and capital accumulation processes that would lead to the installation of Indian manufactures and, subsequently, the gradual installation of factories based on the use of the Steam energy. The industrial strength of Barcelona led to the creation of the Royal Board of Trade that encouraged trade while creating a series of schools necessary for the training of the specialized staff claimed by the new industry.
The paper explores how enlightened thinking about city making, will develop a set of legal and administrative provisions that will impact on a substantial change, both of housing and urban form.