A pre-fabricated (pre-fab) building is a structure that is manufactured off-site and then transported to its final location for assembly. Instead of being constructed on-site from raw materials, pre-fab buildings are built in a controlled environment, such as a factory, where various components are produced and assembled. These components can include walls, floors, roofs, and other structural elements.

There are different types of pre-fabricated buildings, ranging from small modular homes to larger structures like commercial buildings and industrial facilities. The key advantages of pre-fab buildings include faster construction times, cost savings, and a more controlled manufacturing process. Additionally, pre-fab construction can be more sustainable, as it often generates less waste and can incorporate environmentally friendly materials.