Flexibility. One can add to a modular construction, including creating high rises. When the needs alter, modular buildings can be disassembled and the modules relocated or refurbished for their next usage reducing the demand for raw materials and minimizing the total amount of energy expended to create a building to fit the new demand. In essence, the whole construction can be recycled in some instances.
Low waste. With the very same programs being continuously built, the manufacturer has records of precisely what quantity of substances are needed for a specified job. With the consistency, most builders can design systems that use common lengths of lumber, wallboard, etc., cut things with maximum efficiency, or have the ability to order exceptional lengths in bulk. While waste from a site-built residence may generally fill several big dumpsters, building of a modular dwelling generates much less waste. According to the UK group WRAP, up to a 90% reduction in materials can be achieved via using modular structure.
Modular construction allows for the building and the site work to be performed concurrently. According to some substances, this can reduce the overall completion schedule by as much as 50%. This also reduces labor, financing and supervision costs. To save even more time and money, the majority of engineering and design areas are a part of the manufacturing process. During site-built construction, walls can't be set until floors are set up, and ceilings and rafters cannot be added until walls have been erected. On the other hand, with modular construction, walls, flooring, ceilings, and rafters are all built at the exact same time, then brought together in precisely the exact same mill to form a construction. This procedure can allow modular construction times of half that of conventional, stick-built structure.
Quality. Combining traditional building techniques, quality manufacturing and third-party agencies that provide random inspections, testing, and certification services for quality control, commercial modular structures are made in strict accordance with appropriate local, state, and national regulations and codes. Due to the requirement to transport modules to the final website, each module must be constructed to independently withstand traveling and installation prerequisites. Thus the closing module-to-module assembly of independently durable elements can yield a last product that is more durable than site-built constructions. Modular buildings often utilize Structural Insulated Panels (SIPs) in construction, which provide a range of benefits over traditional construction materials. SIPs panels are a light yet durable combination of panel board and closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulation. They're air-tight, and as such provide exceptional thermal performance. They also offer superior moist and cold resistance when compared to wood and other materials, and are immune to both compression decreasing and cold bridging.  Modular units may also be designed to fit in with external aesthetics of any existing construction and modular units once assembled can be virtually indistinguishable from a site-built construction.
Modular construction can also give an advantage in similar categories in the International Green Construction Code.
Improved Air Quality - Many of the indoor air quality issues identified in new structure result from elevated moisture levels in the farming materials. Since the modular structure is substantially completed in a factory-controlled setting utilizing dry materials, the prospect of high levels of moisture being trapped inside the new structure is eliminated.
Ability to support remote locations. Especially in countries where potential markets might be found far from industrial centers, such as Australia, there may be much higher prices to construct a site-built house in a remote area or a place experiencing a building boom such as mining cities. Modular buildings can also be beneficial in providing sanitary and medical facilities at which time, space, and money are a problem.
Modular buildings have been argued to have benefits over traditional buildings, for many different factors.
Environmentally friendly building process. Modular construction reduces waste and site disturbance in contrast to site-built structures. The controlled environment of the factory allows for more precise structure when allowing the extra materials to be recycled in house. 
Indoor construction. Construction is different from weather, which may boost work efficiency and avoids damaged building material.