Calculations of surface areas and ratios of minimum houses: the case of the murcian barracks = Cálculos de superficies y ratios de casas mínimas: el caso de la barraca murciana

This study presents the implementation and validation of an Integrated Management System (IMS) aimed at optimizing costs and deadlines in multifamily building projects in Metropolitan Lima, Peru. The research was developed under a quantitative approach and a pre-experimental design, applying GIS in five projects selected according to criteria of technical comparability, accessibility to financial information and location in an emerging urban context. Projects without GIS presented an average cost overrun of 8.82%, while those managed with GIS remained at 0.54%, even considering the cost of management. In terms of time, average delays decreased from 15.54% to 7.14%. In addition, a high level of compliance with the system was observed (over 90%), reflecting its operational viability and acceptance by the technical teams. GIS proved to be an effective tool to improve traceability, inter-area coordination and decision-making on site, without requiring high technological investments. These findings confirm the hypothesis that integrated and structured management can mitigate critical deviations in building projects, especially in emerging urban contexts.