Monobath is a software that automates the production of prefabricated bathrooms assemblies of Porcelanosa. It is developed using the API of Revit’s software, taking advantage of the potential and benefits embedded in BIM programs. At the end of the process, the user will have a fully developed prefabricated bathroom fulfilling construction constraints and standards established by Porcelanosa. The user will choose between a catalogue of multiple Porcelanosa’s products and materials to complete the bathroom. Finally, the prefabricated unit will be linked inside the main model with all the MEP systems, connexions, bill of quantities, and a prescription presentation that includes important information about weight and on-site installation besides fabrication processes. The program seeks to multiply the production of prefabricated bathrooms units through a simple process that any Revit’s user can perform.