WordNet (r) 3.0 (2006):

prefabrication
    n 1: the manufacture of sections of a building at the factory so
         they can be easily and rapidly assembled at the building
         site

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "prefabrication":
   architecture, assembly, building, casting, composition, construct,
   construction, conversion, crafting, craftsmanship, creation,
   cultivation, devising, edifice, elaboration, erection,
   establishment, extraction, fabric, fabrication, fashioning,
   formation, forming, formulation, framing, growing, handicraft,
   handiwork, harvesting, house, machining, making, manufacture,
   manufacturing, milling, mining, molding, packaged house, pile,
   prefab, preparation, processing, producing, pyramid, raising,
   refining, shaping, skyscraper, smelting, structure, superstructure,
   tower, workmanship