A housing unit that is assembled in a factory before being relocated is known as what?

The term for a housing unit that is assembled in a factory before being relocated is "manufactured home." This type of home is built entirely in a factory setting and then transported to a site where it is often placed on a permanent foundation. Manufactured homes are constructed according to federal building codes established by the U.S. Department of Housing and Urban Development (HUD).

This distinguishes them from traditional homes, which are built entirely on-site. While modular homes and prefabricated houses also involve factory assembly, they are generally constructed in sections (modules) and may not adhere to the same standards as manufactured homes. Modular homes are typically built to local building codes and can incorporate features and materials similar to site-built homes. In contrast, manufactured homes must conform to federal regulations.

Considering these distinctions, "manufactured home" accurately describes the specific type of housing unit in question.