Low waste. With the very same plans being continuously built, the manufacturer has records of precisely what quantity of substances are necessary for a specified job. Together with the consistency, builders can design systems which use common lengths of lumber, wallboard, etc.. cut items with maximum efficiency, or be able to order exceptional spans in bulk. While waste from a site-built residence may generally fill several large dumpsters, construction of a modular dwelling generates much less waste. According to the UK group WRAP, up to a 90% reduction in materials can be accomplished via using modular structure. Materials minimized contain: wood pallets, shrink wrap, cardboard, plasterboard, timber, bricks, concrete, and cement.
Speed of construction/faster return on investment. Modular construction allows for the building and the site work to be completed concurrently. According to some substances, 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 a part of the manufacturing process. Also unique to modular structure is the ability to simultaneously construct a building's floors, ceilings, walls, rafters, and roofs. During site-built structure, walls can't be set until floors are in position, and ceilings and rafters can't be added till walls have been erected. On the flip side, with modular construction, walls, flooring, ceilings, and rafters are all constructed at precisely the exact same time, and then brought together in precisely the exact same mill to form a building. This process can allow modular construction times of half an traditional, stick-built construction.
Environmentally friendly building procedure. Modular construction reduces waste and site disturbance in contrast to site-built structures. The controlled environment of the factory allows for more accurate construction when allowing the additional stuff to be recycled in-house. 
Flexibility. One can add to a modular building, such as producing high rises. When the demands alter, modular buildings may be disassembled and the modules emptied or refurbished for their next use reducing the demand for raw materials and minimizing the total amount of energy expended to make a construction to meet the new demand. In essence, the entire construction can be recycled in some cases.
Modular construction may also provide an advantage in similar categories in the International Green Construction Code.
Modular buildings are argued to have benefits over traditional buildings, for a variety of reasons.
Ability to service remote locations. Particularly in countries in which prospective markets might be located far from industrial centers, such as Australia, there may be much higher prices to construct a site-built house in a distant area or an area experiencing a construction boom like mining cities. Modular buildings are also beneficial in providing medical and sanitary facilities where space, time, and money are an issue.
Improved Air Quality - A lot of the indoor air quality problems identified in new construction result from elevated humidity levels from the framing materials. Since the modular structure is substantially finished in a factory-controlled setting utilizing dry materials, the prospect of high levels of moisture being trapped in the new structure is removed.
Indoor construction. Assembly is different from weather, which can increase work efficiency and avoids damaged construction material.
Quality. Combining traditional building methods, quality manufacturing and third party agencies that provide random inspections, testing, and certification solutions for quality control, commercial modular structures are made in strict accordance with appropriate local, state, and national regulations and codes. On account of the need to transport modules to the final website, each module must be constructed to independently withstand traveling and installation requirements. Thus the closing module-to-module meeting of independently durable elements can yield a last product which is more durable than site-built structures. SIPs panels are a mild yet lasting combination of panel board and either closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulating foam. They also provide superior damp and cold immunity when compared to timber and other substances, and are immune to both compression decreasing and cold bridging.  Modular units might also be designed to match in with external aesthetics of any existing construction and modular units after constructed can be virtually indistinguishable from a site-built construction.