The purpose of this work is to design, develop and validate a proposal for improvement based on process management and planning tools PERT-CPM and MRP in a construction company. Through the identification of its current situation, an unfavorable scenario is determined based on the ratio of its projected and obtained profits, on which the main problem it's the poor operational management and the root causes related to inefficient processes of planning, sourcing and execution. The systematic and structured optimization of the aforementioned processes is sought through the development of an applied research project, with the objective of reducing the problem identified through the use of methodologies, techniques and tools related to industrial engineering. The research it's focused on the study of the processes of Diarco, a peruvian construction company dedicated to the construction of civil works, which were analyzed and redesigned through Business Process Management and incorporating the aforementioned planning tools, proposing a structured proposal of the new designed work system that proved to be viable in the functional, economic, environmental, social and technological sense, backed by the development of a study pilot. The improvement proposal concluded in the reduction of materials, man hours and penalties for late deliveries within the construction projects carried out, concretizing in an economically viable project with a VAN of S /. 324,101.34, a TIR of 79% and a B/C index 3.81.