What Is MEP in Construction? Understanding Mechanical Electrical Plumbing Systems in Buildings MEP plays a critical role in construction, yet it is one of the most commonly misunderstood aspects of a building. MEP stands for Mechanical, Electrical, and Plumbing systems, and together they form the backbone that makes a structure functional, safe, and comfortable for everyday use. Mechanical systems focus on indoor comfort and movement within the building. This includes HVAC systems that regulate