Every building has a hidden war: the structural beams, the supply ducts, the plumbing mains, the electrical conduit, and the fire sprinklers all need the same six inches of ceiling plenum. MEP coordination is how they share it without colliding. Here's the discipline behind the fit.
The problem
Modern buildings pack more systems into tighter plenums: larger ventilation rates, more plumbing, denser electrical, fire protection everywhere. The architect's ceiling height is fixed. The systems must fit in what's left after structure — often 12-18 inches. Without coordination, the field discovers the collisions: the duct that hits the beam, the pipe through the shear wall, the conduit with nowhere to go. Field fixes are the most expensive engineering in construction.
The BIM process
**Model everything.** Each trade models its systems in 3D: ductwork with fittings, piping with slopes, conduit racks, equipment clearances. The structural model provides the constraints. The coordination model federates them all.
**Clash detection.** Software finds every hard clash (geometry intersecting) and clearance clash (violating the maintenance-access envelopes). A large project generates thousands of clashes — the coordination meetings resolve them by priority: gravity systems (plumbing drainage, which can't move vertically) win over pressure systems; structure wins over everything.
**The resolution hierarchy.** Structure first (beams don't move), then gravity drainage (slope is sacred), then large ductwork, then piping, then conduit and cable tray. Equipment access clearances are protected — the maintainable building beats the tightly packed one.
The deliverables
Coordinated shop drawings (the installation drawings the field builds from — signed off by all trades), sleeve and opening layouts (every penetration through structure located and sized before concrete is placed), and the as-built model (the digital twin the owner operates from).
Why owners should care
Uncoordinated MEP is the number-one source of change orders and schedule delays in commercial construction. The coordination effort (typically 1-3% of MEP cost) prevents field collisions costing 10x that. Ask your engineer: who's running coordination, what LOD (level of development) the models target, and how clashes get resolved. The coordinated building costs less than the uncoordinated one — every time.