Modular construction allows for the building and the site work to be completed simultaneously. According to some materials, this can reduce the total completion schedule by as much as 50%. This also reduces labour, financing and oversight costs. To save time and money, nearly all engineering and design areas are part of the manufacturing process. During site-built structure, walls cannot be set until floors are in position, and ceilings and rafters can't be added until walls have been erected. On the flip side, with modular structure, walls, floors, ceilings, and rafters are all built at the same time, and then brought together at the same mill to form a building. This procedure can enable modular building times of half that of traditional, stick-built construction.
Indoor construction. Construction is different from weather, which can increase work efficiency and averts damaged construction material.
Quality. Combining traditional building techniques, quality manufacturing and third-party agencies that provide arbitrary inspections, testing, and certification services for quality management, commercial modular structures are made in strict compliance with appropriate local, state, and federal rules and regulations. On account of the need to transport modules to the final site, each module has to be built to independently withstand travel and installation requirements. Thus the closing module-to-module assembly of independently durable components can yield a final product that is more durable than site-built structures. Modular buildings often utilize Structural Insulated Panels (SIPs) in construction, which provide a range of benefits over traditional construction materials. They also offer superior moist and cold resistance when compared to wood and other substances, and are resistant to both compression decreasing and cold bridging.  Modular units may also be made to fit in with outside aesthetics of any existing building and modular units once assembled can be virtually indistinguishable from a site-built structure.
Modular buildings may also contribute to LEED requirements in any kind site-built structure may, and can even supply an edge in the fields of Sustainable Sites, Energy and Atmosphere, Materials and Resources, and Indoor Environmental Quality. Modular construction can also provide an edge in similar classes from the International Green Construction Code.
Low waste. With the very same plans being constantly built, the producer has records of precisely what quantity of substances 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 efficacy, or have the ability 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. As stated by the UK group WRAPup to a 90% decrease in substances can be achieved through the use of modular structure.
Modular buildings have been argued to have benefits over conventional buildings, for a variety of factors.
Environmentally friendly construction procedure. The controlled environment of the factory allows for more accurate construction when permitting the extra stuff to be recycled in-house. 
Ability to service remote locations. Particularly in countries in which prospective markets might be found far from industrial facilities, such as Australia, there can be much higher costs to build a in-house property in a remote area or a place experiencing a construction boom like mining towns. Modular buildings can also be beneficial in providing medical and sanitary facilities where time, space, and funds are a problem.
Improved Air Quality - A lot of the indoor air quality problems identified in new construction result from high humidity levels from the framing materials. Since the modular structure is substantially completed in a factory-controlled setting using abrasive materials, the potential for elevated levels of moisture being trapped in the new structure is eliminated.
Flexibility. An individual can add to a modular construction, such as creating high rises. When the demands alter, modular buildings can be disassembled and the modules emptied or refurbished for their next use reducing the requirement for raw materials and minimizing the amount of energy expended to create a building to meet the new demand. Essentially, the entire building could be recycled in some instances.