Modular buildings have been argued to have advantages over traditional buildings, for many different reasons.
Environmentally friendly building process. Modular construction reduces waste and site disturbance in contrast to site-built structures. The controlled environment of the mill allows for more accurate construction when allowing the additional materials to be recycled in house. 
Low waste. With the very same plans being constantly built, the producer has records of exactly what amount of materials are needed for a given job. Together with the consistency, builders can design systems which use common lengths of lumber, wallboard, etc.. cut things with maximum efficacy, or be able to order special spans in bulk. While squander from a site-built dwelling may typically fill several large dumpsters, building of a modular house creates much less waste. According to the UK group WRAP, up to a 90% reduction in materials can be accomplished via the use of modular construction.
Improved Air Quality - A lot of the indoor air quality issues identified in new structure result from high humidity levels from the framing materials. Since the modular structure is substantially finished in a factory-controlled setting utilizing abrasive materials, the potential for high levels of moisture being trapped inside the new construction is eliminated.
Quality. Combining traditional building techniques, quality manufacturing and third party agencies who provide random inspections, testing, and certification services for quality control, commercial modular structures are built in strict compliance with appropriate local, state, and national regulations and codes. Due to the requirement to transport modules to the final website, each module must be built to independently withstand travel and installation requirements. Thus the closing module-to-module meeting of independently durable components can yield a last product which is more durable than site-built constructions. Modular buildings frequently utilize Structural Insulated Panels (SIPs) in construction, which offer a range of benefits over traditional construction materials. They're air-tight, and as such provide exceptional thermal performance. They also offer exceptional damp and cold immunity when compared to wood and other substances, and are resistant to both compression shrinking and cold bridging.  Modular units might also be designed to match in with external aesthetics of any present construction and modular units after assembled can be almost indistinguishable from a site-built construction.
Indoor construction. Assembly is different from weather, which can increase work efficiency and averts damaged construction material.
Modular construction allows for the building and the site work to be performed concurrently. According to some substances, this can reduce the overall completion schedule by up to 50%. This also reduces labour, financing and oversight expenses. To save even more time and money, nearly all design and engineering disciplines are part of the manufacturing procedure. Also unique to modular construction is the capacity to simultaneously construct a building's floors, walls, ceilings, rafters, and roofs. During site-built construction, walls can't be set until floors are in position, and ceilings and rafters cannot be added until walls are erected. On the other hand, with modular construction, walls, floors, ceilings, and rafters are all constructed at the exact same time, then brought together in the same factory to form a building. This process can allow modular building times of half an conventional, stick-built construction.
Modular buildings can likewise contribute to LEED requirements in any category site-built construction can, and can even provide an edge in the areas of Sustainable websites, Energy and Atmosphere, Materials and Resources, and Indoor Environmental Quality. Modular construction may also provide an advantage in similar categories in the International Green Construction Code.
Ability to support remote locations. Particularly in countries in which potential markets might be located far from industrial centers, such as Australia, there may be a lot higher prices to build a site-built house in a distant area or a place experiencing a construction boom such as mining towns. Modular buildings can also be beneficial in providing medical and sanitary facilities where space, time, and funds are an issue.
Flexibility. One can continually add to a modular building, such as creating high rises. When the needs alter, modular buildings may be disassembled and the modules relocated or refurbished to their next usage reducing the demand for raw materials and minimizing the amount of energy expended to create a building to fit the new demand. In essence, the entire building can be recycled in some instances.