Low waste. With the very same programs being continuously built, the manufacturer has records of precisely what amount of materials are necessary for a given job. With the consistency, most builders can design systems that use common lengths of timber, wallboard, etc., cut items with maximum efficiency, or be able to order special spans in bulk. While waste from a site-built residence may generally fill several large dumpsters, construction of a modular house creates much less waste. According to the UK group WRAPup to a 90% decrease in materials can be achieved through the use of modular construction. Materials minimized include: wood pallets, shrink wrap, cardboard, plasterboard, timber, concrete, bricks, and cement.
Flexibility. An individual can add to a modular building, such as producing high rises. When the needs change, modular buildings may be disassembled and the modules relocated or refurbished for their next use reducing the requirement for raw materials and minimizing the amount of energy expended to create a construction to meet the new demand. Essentially, the entire building could be recycled in some cases.
Improved Air Quality - A lot of the indoor air quality problems identified in new construction 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 prospect of elevated levels of moisture being trapped inside the new structure is removed.
Indoor construction. Assembly is different from weather, which may boost work efficiency and avoids damaged construction material.
Ability to support remote locations. Especially in countries where prospective markets may be found far from industrial centers, such as Australia, there can be much higher prices to construct a in-house property in a remote area or an area experiencing a construction boom such as mining cities. Modular buildings can also be beneficial in providing medical and sanitary facilities at which time, space, and money are an issue.
Modular buildings have been argued to have advantages over traditional buildings, for many different factors.
Environmentally friendly building process. The controlled environment of the factory allows for more precise structure when permitting the extra stuff to be recycled in-house. 
Modular construction can also give an advantage in similar categories from the International Green Construction Code.
Modular construction allows for the building and the site work to be completed simultaneously. According to some materials, this can reduce the overall completion schedule by as much as 50%. This reduces labour, financing and oversight costs. To save time and money, nearly all engineering and design disciplines are part of the manufacturing procedure. Also unique to modular structure is the capacity to simultaneously construct a building's floors, ceilings, walls, rafters, and roofs. During site-built structure, walls cannot be set until floors are in position, and ceilings and rafters cannot be added until walls have been erected. On the flip side, with modular construction, walls, floors, ceilings, and rafters are all constructed at precisely the exact same time, and then brought together in precisely the same mill to form a building. This procedure can allow modular building times of half that of conventional, stick-built structure.
Quality. Combining traditional building methods, quality manufacturing and third party agencies who provide random inspections, testing, and certification services for quality management, commercial modular buildings are made in strict accordance with appropriate local, state, and national rules and regulations. On account of the need to transport modules to the final website, each module has to be constructed to independently withstand travel and installation requirements. Thus the final module-to-module assembly of independently durable elements can yield a final product that is stronger than site-built constructions. They are air-tight, and as such provide exceptional thermal performance. They also provide superior damp and cold resistance when compared to timber and other substances, and are resistant to both compression shrinking and cold bridging.  Modular units may also be made to fit in with external aesthetics of any existing building and modular units after assembled can be almost indistinguishable from a site-built structure.