The buildings are 60% to 90% completed offsite in a factory-controlled surroundings, and transported and assembled at the final construction website. This can include the entire building or be parts or subassemblies of larger structures. Oftentimes, modular contractors operate with conventional general contractors to exploit the resources and advantages of each form of construction. Completed modules are hauled to the building site and assembled by means of a crane. Positioning of the modules can take from a few hours to several days.
Modular buildings may be used for long-term, temporary or permanent facilities, such as construction camps, universities and schools, military and civilian home, and industrial facilities. Modular buildings are used in rural and remote areas where traditional construction might not be reasonable or possible, by way of example, the Halley VI accommodation pods used for a BAS Antarctic trip.  Other uses have included churches, healthcare facilities, sales and retail offices, quick food restaurants and cruise boat construction. They may also be used in areas that have weather concerns, like hurricanes.
The entire process of modular building places significance on the plan stage. This is really where practices such as Design for Manufacture and Assembly (DfMA) have been used to ensure that assembly tolerances are regulated throughout manufacture and assembly on site. It is crucial that there is sufficient allowance at the design to enable the meeting to take any"idle" or misalignment of components. The usage of advanced CAD systems, 3D printing and manufacturing management systems are essential for modular structure to be successful. This is very unlike on-site construction where the tradesman can often create the part to suit any specific installation.
Material for stick built and modular houses will be the same. Modular homes are not doublewides or mobile homes. First, modular homes do not have axles or a metal frame, meaning that they are generally transported on flat-bed trucks. Modular buildings must conform to all relevant regional building codes, while doublewides and mobile homes have metal under framing. Doublewides and mobile homes made in the USA need to conform to federal codes governed by U.S. Department of Housing and Urban Development.
Modular buildings and modular houses are prefabricated buildings or houses that consist of recurrent sections called modules. "Modular" is a building method that involves constructing sections away from the construction site, then sending them to the planned website. Setup of the prefabricated sections is finished on site. Prefabricated sections are sometimes placed utilizing a crane. The modules can be set side-by-side, end-to-end, or stacked, allowing a variety of configurations and styles.
Permanent modular buildings are designed to meet or exceed the exact same construction codes and standards as site-built structures and also the exact same architect-specified materials used in conventionally built buildings are used in modular building projects. PMC can have as many stories as construction codes allow. Unlike relocatable buildings, PMC structures are meant to stay in 1 place for the whole period of their useful life.
Modular buildings, also called prefabricated homes or precision built homes, are built to equal or higher standards as onsite stick-built houses. The building method is known as permanent modular structure.
Construction is offsite, with lean manufacturing methods to prefabricate single or multi-story buildings in deliverable module sections. Modular components are typically constructed inside on assembly lines. Modules' construction may take as few as ten times but more often one to three months.