Converting a shop or office into a home in Barcelona is a complex legal journey. Property owners must first verify if the building's zoning allows for increased residential density. A preliminary urban report costs around 600 euros, while the mandatory preliminary project for the license can add another 1,500 euros to the initial budget.

Habitability standards in Barcelona are stricter than regional Catalan laws. A minimum of 40 square meters of usable space and a ceiling height of 2.5 meters are required. Additionally, the space must have proper ventilation, sanitation, and electricity, and residential use of basements is strictly prohibited.

According to the College of Property Managers of Barcelona, once the conversion is legalized, it must be recorded in the property deeds. This process increases the property value and allows owners to access domestic utility rates, which are significantly cheaper than commercial ones.