Modular buildings are argued to have benefits over traditional buildings, for many different factors.
Environmentally friendly building process. Modular construction reduces waste and site disturbance in contrast to site-built structures. The controlled environment of the factory allows for more precise structure while permitting the extra materials to be recycled in house. 
Low waste. With the very same programs being continuously built, the manufacturer has records of exactly what quantity of materials are needed for a specified job. Together with the consistency, builders can design systems which use common lengths of timber, 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 big dumpsters, building of a modular dwelling generates much less waste. According to the UK group WRAP, up to a 90% decrease in materials can be accomplished through using modular construction.
Modular construction permits for the building and the site work to be performed concurrently. According to some materials, this can reduce the overall completion schedule by up to 50%. This reduces labor, financing and oversight costs. To save time and money, nearly all design and engineering disciplines are a part of the manufacturing process. During site-built structure, walls cannot be set until floors are set up, and ceilings and rafters can't be added until walls are erected. On the flip side, with modular construction, walls, floors, ceilings, and rafters are all built at the exact same time, then brought together at the exact same factory to form a building. This process can enable modular construction times of half that of conventional, stick-built structure.
Quality. Mixing traditional construction techniques, quality manufacturing and third-party agencies who provide random inspections, testing, and certification solutions for quality control, commercial modular buildings are built in strict compliance with appropriate local, state, and national regulations and codes. Due to the need to transport modules to the final site, each module has to be built to independently withstand travel and installation prerequisites. Thus the closing module-to-module meeting of independently durable elements can yield a final product which is stronger than site-built constructions. They also provide exceptional moist and cold resistance when compared to timber and other materials, and are resistant to both compression decreasing and cold bridging.  Modular units may also be made to match in with outside aesthetics of any present construction and modular units after assembled can be almost indistinguishable from a site-built construction.
Improved Air Quality - A lot of the indoor air quality problems identified in new structure result from elevated humidity levels from the farming materials. Because the modular construction is substantially finished in a factory-controlled setting utilizing dry materials, the potential for elevated levels of moisture being trapped inside the new structure is removed.
Indoor construction. Construction is independent of weather, which can increase work efficiency and averts damaged building material.
Ability to support remote locations. Particularly in countries in which potential markets may be located far from industrial facilities, such as Australia, there can be much higher prices to construct a site-built house in a distant area or an area experiencing a building boom such as mining towns. Modular buildings can also be beneficial in providing sanitary and medical facilities at which time, space, and money are a problem.
Modular construction can also give an edge in similar categories from the International Green Construction Code.
Flexibility. An individual can add to a modular construction, including creating high rises. When the needs alter, modular buildings may be disassembled and the modules emptied or refurbished to their next usage reducing the requirement for raw materials and minimizing the amount of energy expended to create a construction to fit the new need. Essentially, the whole construction could be recycled in some instances.