MEP engineering is the science and art of planning, designing and managing the MEP systems of a building. Also known as mechanical, electrical, and plumbing engineering consulting firms, they are important across all stages of the construction process. They assist with decision making, cost estimation, construction administration, documentation, building management, and building maintenance. MEP systems make a building livable and pleasant, no matter if it is a single-story home or a high-rise skyscraper.