prefabricating

/P R IY0 F AE1 B R IH0 K EY0 T IH0 NG/
verb
  1. 1

    To manufacture (a building, etc.) in standard components that can be fitted together on site.

Source: https://en.wiktionary.org/wiki/prefabricate, https://en.wiktionary.org/wiki/prefabricating