Modular/Prefabricated Construction
CSI Division 13, Special Construction
A construction method where entire building sections, such as modules, panelized walls, or fully assembled rooms, are manufactured in an off-site factory under controlled conditions, then transported to the site and set into place, rather than being built piece by piece in the field.
Why it matters
Modular construction shifts a large share of the actual building work off the critical path of site conditions and weather, often compressing the overall schedule significantly, but it also requires design decisions to be finalized much earlier than conventional construction, since a factory can't easily accommodate a late field change the way an on-site crew might.
On a real project
A hotel's guest rooms are manufactured as complete modules, already framed, wired, plumbed, and finished, in a factory, then transported to the site and stacked and connected by crane, dramatically compressing the time needed compared to building each room from scratch on site.
Who this matters most to
A Project Engineer manages the tight coordination required between the factory's production schedule and the site's readiness to receive modules, since a module arriving before its foundation or utility connections are ready creates an expensive bottleneck. A Superintendent manages a very different sequence on a modular project, set and connect rather than build in place, that requires different site logistics planning.
Where this goes wrong
A project orders modular units without finalizing certain interior finish selections in time for the factory's production schedule, assuming those details could still be adjusted the way they could on a conventional job. The factory proceeds with its own default finishes to stay on schedule, and the owner ends up with units that don't match what they expected, a mismatch caused by treating modular design decisions with the same late-stage flexibility as conventional construction.