MEP (Mechanical, Electrical & Plumbing) design is a crucial part of modern building planning because it turns architectural spaces into fully functioning environments that are comfortable, safe, efficient, and sustainable. MEP systems — like HVAC for climate control, electrical distribution for power and lighting, and plumbing for water and wastewater — ensure that buildings meet occupant needs and operational standards. Proper design enhances indoor comfort and air quality, ensures safety and compliance with codes, improves energy efficiency and sustainability, and helps avoid costly redesigns during construction. Coordinated MEP design also supports long-term maintenance, reduces operational costs, and integrates smart technologies such as building automation and green systems like water reuse and renewable energy.