Modular delivery promises a faster route to a working facility, and on the right project it delivers exactly that. What it does not do is remove coordination risk. It relocates it, into the seam between the factory floor and the site, a handoff that conventional construction protocols were never designed to watch.

That seam is where the expensive failures live. A gasket substituted on the factory floor for sound reasons that nobody thought to report. A design change that reached the site team but never reached the fabricator. A truck journey nobody instrumented. A module that passed every test it was given, and still could not hold dew point once installed.

This is a practitioner's field manual for the cost and coordination gaps that modular delivery introduces into cleanrooms, dry rooms, battery plants, semiconductor fabs, and data centre power and cooling skids.

For quantity surveyors, cost managers, project controls professionals, commissioning agents, owner's representatives, and anyone accountable for a facility that arrives on a truck.