Chapter 18 examines how construction methods themselves are evolving and how BIM enables these changes. The most significant trend is off-site manufacturing and modular construction. Instead of building on site in all weather, components are fabricated in controlled factory environments and assembled on site. This requires unprecedented precision: modules built hundreds of miles away must align within millimeters. BIM provides the digital coordination necessary.
A manufacturer receives a BIM model of the module, produces it exactly to specification, and then the on-site team uses the same model for placement.
The chapter provides examples: hospital patient rooms manufactured as complete pods (including finishes, plumbing, and medical gas) and stacked into a building frame; hotel bathrooms constructed off-site and installed as finished units; data center cooling modules built and tested in a factory before shipment.
Digital fabrication (also called "file-to-factory") uses BIM data to drive CNC machines (computer numerical control). A steel fabricator receives an IFC model and automatically generates machine code for cutting, drilling, and welding. This eliminates manual measurement and re-keying of dimensions, reducing errors from 5% to near zero.
Robotic construction is emerging: robots that lay bricks, tie rebar, or spray concrete, guided by BIM coordinates.
3D printing of buildings (extruded concrete) is still experimental but progressing. The chapter also covers additive manufacturing for custom formwork, unique architectural features, and spare parts for legacy buildings. The authors acknowledge that off-site and digital fabrication require different contractual models, different supply chain relationships, and different risk allocations.
They advise starting with small, repetitive elements (stairs, toilet pods, facade panels) before tackling entire modules. The future of construction, they argue, looks less like a muddy site and more like an assembly line—and BIM is the operating system of that assembly line.
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