Modular buildings have been argued to have benefits over traditional buildings, for many different factors.
Environmentally friendly building process. The controlled environment of the factory allows for more accurate construction when allowing the extra stuff to be recycled in house. 
Ability to support remote locations. Especially in countries where prospective markets may be located far from industrial facilities, such as Australia, there may be much higher costs to construct a site-built house in a remote area or a place experiencing a construction boom like mining cities. Modular buildings are also beneficial in providing medical and sanitary facilities at which time, space, and funds are an issue.
Low waste. With the same programs being constantly built, the manufacturer has records of precisely what quantity of substances are needed for a specified job. Together with the consistency, builders can design systems which use common lengths of lumber, wallboard, etc., cut items with maximum efficacy, or have the ability to order special spans in bulk. While waste from a site-built residence may generally fill several large dumpsters, building of a modular house creates much less waste. According to the UK group WRAPup to a 90% reduction in materials can be achieved via the use of modular structure.
Speed of construction/faster return on investment. Modular construction permits for the building and the site work to be performed simultaneously. According to some materials, this can reduce the overall completion schedule by as much as 50%. This reduces labor, financing and supervision costs. To save even more time and money, nearly all engineering and design areas are part of the manufacturing process. During site-built structure, walls can't be set until floors are set up, and ceilings and rafters cannot be added till walls are erected. On the flip side, with modular structure, walls, flooring, ceilings, and rafters are all constructed at the same time, then brought together at the same factory to form a construction. This procedure can allow modular construction times of half that of conventional, stick-built construction.
Flexibility. An individual can continually add to your modular building, including creating high rises. When the needs alter, modular buildings can be disassembled and the modules relocated or refurbished to their next usage reducing the requirement for raw materials and minimizing the amount of energy expended to create a building to fit the new demand. Essentially, the entire construction could be recycled in some cases.
Modular buildings may likewise contribute to LEED conditions in almost any kind site-built construction may, and can even provide an edge in the fields of Sustainable Sites, Energy and Atmosphere, Materials and Resources, and Indoor Environmental Quality. Modular construction may also give an advantage in similar classes from the International Green Construction Code.
Improved Air Quality - A lot of the indoor air quality issues identified in new construction result from high humidity levels from the framing materials. Because the modular construction is substantially completed in a factory-controlled setting utilizing abrasive materials, the potential for high levels of moisture being trapped in the new construction is removed.
Quality. Mixing traditional construction methods, quality manufacturing and third party agencies that provide arbitrary inspections, testing, and certification services for quality control, commercial modular buildings are made in strict compliance with appropriate local, state, and federal regulations and codes. On account of the requirement to transport modules to the final website, each module has to be built to independently withstand traveling and installation prerequisites. Thus the final module-to-module assembly of independently durable components can yield a last product which is stronger than site-built constructions. Modular buildings frequently use Structural Insulated Panels (SIPs) in construction, which offer a range of advantages over traditional construction materials. SIPs panels are a light yet lasting mix of panel board and either closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulation. They're air-tight, and as such provide excellent thermal performance. They also provide superior damp and cold resistance when compared to timber and other substances, and are resistant to both compression decreasing and cold bridging.  Modular units may also be designed to match in with outside aesthetics of any present construction and modular units after assembled can be virtually indistinguishable from a site-built structure.
Indoor construction. Construction is different from weather, which can boost work efficiency and averts damaged building material.