Modular construction allows for the building and the site work to be completed concurrently. According to some materials, this can decrease the total completion schedule by as much as 50%. This also reduces labour, financing and oversight costs. To save time and money, the majority of design and engineering areas are a part of the manufacturing procedure. Also unique to modular construction is the ability to simultaneously construct a building's floors, walls, ceilings, rafters, and roofs. During site-built structure, walls can't be placed until flooring are set up, and ceilings and rafters can't be added till walls are erected. On the other hand, with modular structure, walls, flooring, ceilings, and rafters are all built at precisely the exact same time, then brought together at precisely the exact same mill to form a building. This process can enable modular construction times of half that of traditional, stick-built structure.
Ability to support remote locations. Particularly in countries where prospective markets may be located far from industrial facilities, such as Australia, there can be a lot higher costs to build a site-built house in a distant area or an area experiencing a construction boom like mining towns. Modular buildings can also be beneficial in providing medical and sanitary facilities where time, space, and money are a problem.
Modular buildings may also contribute to LEED conditions in almost any kind site-built structure may, and can even provide an edge in the fields of Sustainable websites, 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.
Flexibility. An individual can continually add to a modular building, such as producing high rises. When the needs alter, modular buildings may be disassembled and the modules relocated or refurbished to their next usage reducing the requirement for raw materials and minimizing the amount of energy expended to create a building to fit the new need. In essence, the whole construction could be recycled in some cases.
Quality. Mixing traditional construction methods, quality manufacturing and third-party agencies that offer random inspections, testing, and certification solutions for quality management, commercial modular buildings are built in strict accordance with appropriate local, state, and federal rules and regulations. On account of the need to transport modules to the last site, each module must be built to independently withstand travel and installation prerequisites. Thus the final module-to-module meeting of independently durable elements can yield a final product which is more durable than site-built constructions. SIPs panels are a mild yet durable combination of board and closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulating foam. They also offer exceptional moist and cold resistance when compared to wood and other materials, and are immune to both compression shrinking and cold bridging.  Modular units might also be made to fit in with outside aesthetics of any existing construction and modular units once constructed can be almost indistinguishable from a site-built construction.
Environmentally friendly building process. The controlled environment of the mill allows for more accurate construction while permitting the additional stuff to be recycled in-house. 
Indoor construction. Assembly is different from weather, which can boost work efficiency and avoids damaged construction material.
Improved Air Quality - A lot of the indoor air quality problems identified in new construction result from high humidity levels from the framing materials. Because the modular structure is substantially completed in a factory-controlled setting utilizing abrasive materials, the potential for elevated levels of moisture being trapped in the new structure is eliminated.
Modular buildings have been argued to have advantages over traditional buildings, for many different factors.
Low waste. With the very same plans being continuously built, the manufacturer has records of exactly what quantity of substances are necessary for a given job. Together with the consistency, builders can design systems which use common lengths of lumber, wallboard, etc.. cut items with maximum efficacy, or have the ability to order special lengths in bulk. While waste from a site-built residence may generally fill several big dumpsters, construction of a modular dwelling generates much less waste. As stated by the UK group WRAP, up to a 90% reduction in materials can be achieved through using modular structure. Materials minimized contain: timber pallets, shrink wrap, cardboard, plasterboard, wood, concrete, bricks, and cement.