Most of the time, those who refer to modular churches and prefab churches are generally speaking about the same thing – a building or component of a building that is made in advance and off of a construction site. However, there is some slight distinction between these terms.

Mainly, prefabricated buildings are a bit more of a catch-all term referring to both buildings and building components. On the other hand, modular buildings often indicate a more complete unit that is far more ready to install without additional setup. A complete room or wing of a building would be an example of a modular building in this case.