A PRE-ENGINEERED BUILDING is fabricated off-site and then shipping to your property for assembly
While this might sound like a manufactured home, it is different. It is simply a structure with prefabricated parts which are shipped out to you for assembly on-site. If you order a metal building kit, you are putting together a pre-engineered building. These may also be called a “PEB” for short, or sometimes a “PEMB,” which stands for “pre-engineered metal building.”
PRECAST CONCRETE is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and lifted into place. In contrast, cast-in-place concrete is poured into site-specific forms and cured on site
PREFAB is “prefabricated” and built in a factory setting It is not a single specific method of construction, but rather an entire category of construction methods. To fall under such a category, either the entirety of a building or components of a building need to be prefabricated in a factory before being shipped out to a site. Many metal structures fall under the umbrella of prefabricated buildings.
A MODULAR BUILDING is a specific type of prefabricated building. As is described by the name, a modular structure consists of modules that have been preassembled in a factory, shipped to a site, and stacked in some fashion (horizontally, vertically, or both) at that site. More accurately called prefabricated prefinished volumetric construction, are structures that are at least 70% prefabricated before shipping
