The MEP engineer should be engaged at the start of schematic design at minimum, in time to provide a preliminary mechanical section through the typical floor before floor-to-floor heights are fixed.

On projects with complex ceiling conditions, WELL targets, decarbonization goals, or HVHZ structural requirements, earlier is better.

Yes, provided the coordination begins early enough to route outdoor air quantities required by ASHRAE 62.1 and WELL Building Standard v2 without forcing ceiling compromises.

Acoustic performance targets under WELL, particularly for HVAC background noise levels, also require system selection decisions made before the architectural design is locked.

The cost varies by project scale and the severity of the conflict. Permit revision fees, schedule delays, re-drawing fees, and owner change orders are all direct consequences of MEP conflicts discovered after design development.

The indirect cost, damage to the architect-owner relationship when the delivered space differs from what was approved is harder to quantify and more difficult to recover from.

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