Prefabrication: Generally is understood as a factory-built house delivered completed to the site. Prefabrication still requires the use both in the factory and also onsite of skilled labour. (Builder, plumber, electrician, tiler, stopper, painter etc.) With the additional cost of expensive transport & both factory and onsite cranage, a prefabricated house can cost more than an onsite build.
Module: Generally understood as a factory-built significant part of a house. For example, a bathroom still requires the factory use of skilled labour (Builder, plumber, electrician, tiler, stopper painter etc.). With the additional cost of expensive transport & both ex-factory and onsite craneage, a factory-built bathroom can cost the same as an onsite build.
Component: With design duplication, the direct manufacturer supply of materials and the mass factory construction of the bathroom components, two low skilled workers with a qualified builder can physically place in position the components and complete two back to back bathrooms on a wet wall component in just one morning or afternoon and save up to 80% of the traditional labour cost.