Low waste. With the same programs being constantly built, the producer has records of exactly what amount of materials are needed for a given job. With the consistency, builders can design systems that use common lengths of timber, wallboard, etc.. cut items with maximum efficacy, 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 dwelling generates much less waste. As stated by the UK group WRAP, up to a 90% reduction in substances can be achieved through the use of modular structure. Materials minimized include: timber pallets, shrink wrap, cardboard, plasterboard, timber, bricks, concrete, and cement.
Modular buildings have been argued to have benefits over conventional buildings, for a variety of factors.
Quality. Mixing traditional construction methods, quality manufacturing and third-party agencies that offer random inspections, testing, and certification services for quality control, commercial modular buildings are made in strict compliance with appropriate local, state, and national regulations and codes. On account of the need to transport modules to the last website, each module has to be built to independently withstand traveling and setup requirements. Thus the closing module-to-module assembly of independently durable elements can yield a last product that is stronger than site-built structures. SIPs panels are a mild yet durable combination of panel board and either closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulation. They also provide exceptional moist and cold immunity when compared to wood and other materials, and are resistant to both compression decreasing and cold bridging.  Modular units may also be made to match in with external aesthetics of any present construction and modular units after constructed can be almost indistinguishable from a site-built construction.
Indoor construction. Assembly is different from weather, which may boost work efficiency and avoids damaged building material.
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 while permitting the additional materials to be recycled in house. 
Ability to service remote locations. Particularly in countries where potential markets may be located far from industrial centers, such as Australia, there may be much higher costs to build a site-built house in a remote area or an area experiencing a building boom such as mining towns. Modular buildings are also beneficial in providing medical and sanitary facilities at which space, time, and funds are a problem.
Flexibility. One can continually add to a modular building, such as producing high rises. When the demands change, modular buildings may be disassembled and the modules emptied or refurbished to their next use reducing the demand for raw materials and minimizing the amount of energy expended to create a construction to fit the new demand. Essentially, the whole construction can be recycled in some cases.
Improved Air Quality - A lot of the indoor air quality issues identified in new structure result from high moisture levels in the framing materials. Because 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.
Modular construction can also give an edge in similar categories from the International Green Construction Code.
Modular construction permits for the building and the site work to be completed concurrently. According to some materials, this can reduce the overall completion schedule by up to 50%. This also reduces labour, financing and supervision costs. To save even more time and money, nearly all design and engineering areas are part of the manufacturing procedure. During site-built construction, walls can't be placed until flooring are in position, and ceilings and rafters cannot be added till walls are erected. On the other hand, with modular construction, walls, flooring, ceilings, and rafters are all built at precisely the exact same time, then brought together in precisely the exact same factory to form a construction. This procedure can allow modular building times of half an conventional, stick-built structure.