Flexibility. One can add to your modular building, including creating high rises. When the demands alter, modular buildings can be disassembled and the modules emptied or refurbished for their next use reducing the demand for raw materials and minimizing the amount of energy expended to make a construction to meet the new need. Essentially, the whole building can be recycled in some cases.
Quality. Combining traditional building techniques, quality manufacturing and third-party agencies that offer random inspections, testing, and certification services for quality control, commercial modular structures are built in strict compliance with appropriate local, state, and federal regulations and codes. Due to the requirement to transport modules to the last website, each module must be built to independently withstand traveling and setup requirements. Thus the closing module-to-module meeting of independently durable components can yield a last product that is more durable than site-built structures. Modular buildings frequently use Structural Insulated Panels (SIPs) in construction, which provide a range of benefits over traditional building materials. SIPs panels are a mild yet lasting mix of board and closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulating foam. They're air-tight, and as such provide excellent thermal performance. They also provide superior moist and cold immunity when compared to timber and other substances, and are immune to both compression shrinking and cold bridging.  Modular units may also be made to fit in with external aesthetics of any present building and modular units after assembled can be virtually indistinguishable from a site-built structure.
Modular buildings are argued to have advantages over traditional buildings, for many different reasons.
Indoor construction. Construction is independent of weather, which may increase work efficiency and averts damaged building material.
Modular construction may also provide an advantage in similar categories in the International Green Construction Code.
Low waste. With the very same programs being constantly built, the producer has records of exactly what quantity of substances are necessary for a given job. Together with the consistency, most builders can design systems that use common lengths of lumber, wallboard, etc., cut things with maximum efficacy, or be able to order exceptional lengths in bulk. While squander 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 WRAP, up to a 90% decrease in materials can be achieved via the use of modular structure.
Environmentally friendly construction process. The controlled environment of the factory allows for more precise structure when permitting the extra materials to be recycled in house. 
Ability to support remote locations. Particularly in countries where potential markets might be found far from industrial facilities, such as Australia, there can be a lot 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 where space, time, and money are an issue.
Modular construction permits for the construction and the site work to be performed simultaneously. According to some materials, this can decrease the overall completion schedule by as much as 50%. This also reduces labor, financing and supervision costs. To save time and money, the majority of engineering and design disciplines are a part of the manufacturing process. Also unique to modular structure is the capacity to simultaneously construct a building's floors, walls, ceilings, rafters, and roofs. During site-built construction, walls cannot be set until floors are in position, and ceilings and rafters can't be added until walls are erected. On the flip side, with modular structure, walls, flooring, ceilings, and rafters are all constructed at precisely the same time, then brought together at precisely the same mill to form a building. This procedure can enable modular construction times of half that of traditional, stick-built structure.
Improved Air Quality - Many 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 completed in a factory-controlled setting using dry materials, the potential for elevated levels of moisture being trapped inside the new construction is eliminated.