Environmentally friendly building process. Modular construction reduces waste and site disturbance compared to site-built structures. The controlled environment of the factory allows for more accurate construction while allowing the additional stuff to be recycled in-house. 
Indoor construction. Assembly is independent of weather, which can increase work efficiency and avoids damaged building material.
Modular buildings can also contribute to LEED conditions in any kind site-built structure may, and may even supply an advantage in the areas of Sustainable Sites, Energy and Atmosphere, Materials and Resources, and Indoor Environmental Quality. Modular construction can also provide an advantage in similar categories from the International Green Construction Code.
Low waste. With the same plans being continuously built, the producer has records of precisely what amount of substances are needed for a specified job. With the consistency, builders can design systems that use common lengths of lumber, wallboard, etc.. cut things with maximum efficiency, or have the ability to order exceptional spans in bulk. While squander from a site-built residence may generally fill several large dumpsters, building of a modular dwelling generates much less waste. As stated by the UK group WRAP, up to a 90% reduction in substances can be accomplished through the use of modular construction.
Modular buildings have been argued to have advantages over traditional buildings, for a variety of factors.
Ability to service remote locations. Especially in countries in which prospective markets might be located far from industrial centers, such as Australia, there can be a lot higher prices to construct a site-built house in a remote area or an area experiencing a construction boom such as mining towns. Modular buildings are also beneficial in providing sanitary and medical facilities at which time, space, and money are a problem.
Improved Air Quality - Many of the indoor air quality issues identified in new construction result from elevated moisture levels in the farming materials. Because the modular construction is substantially completed in a factory-controlled setting using dry materials, the prospect of elevated levels of moisture being trapped in the new structure is eliminated.
Quality. Mixing traditional construction methods, quality manufacturing and third-party agencies that offer random inspections, testing, and certification services for quality management, commercial modular buildings are made in strict compliance with appropriate local, state, and national rules and regulations. Due to the requirement to transport modules to the last site, each module must be constructed to independently withstand traveling and setup requirements. Thus the final module-to-module assembly of independently durable elements can yield a last product which is more durable than site-built structures. Modular buildings frequently utilize Structural Insulated Panels (SIPs) in construction, which offer a range of benefits over traditional construction materials. SIPs panels are a mild yet lasting combination of board and closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulating foam. They also provide exceptional moist and cold immunity when compared to timber and other substances, and are resistant to both compression shrinking and cold bridging.  Modular units may also be designed to match in with outside aesthetics of any existing building and modular units after assembled can be virtually indistinguishable from a site-built construction.
Flexibility. An individual can add to your modular building, including creating high rises. When the demands change, modular buildings may be disassembled and the modules relocated or refurbished to their next use reducing the demand for raw materials and minimizing the amount of energy expended to make a building to meet the new demand. In essence, the entire construction could be recycled in some instances.
Speed of construction/faster return on investment. Modular construction allows for the building and the site work to be completed simultaneously. According to some substances, this can reduce the overall completion schedule by as much as 50%. This also reduces labor, financing and oversight costs. To save even more time and money, the majority of design and engineering areas are a part of the manufacturing process. During site-built structure, walls cannot be set until floors are set up, and ceilings and rafters can't be added until walls have been erected. On the flip side, with modular construction, walls, floors, ceilings, and rafters are all built at the same time, and then brought together at the exact same mill to form a construction. This process can allow modular building times of half an traditional, stick-built structure.