Modular buildings have been argued to have benefits over conventional buildings, for a variety of reasons.
Flexibility. One can add to your modular building, including creating high rises. When the needs 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 create a building to meet the new need. In essence, the entire building can be recycled in some instances.
Quality. Mixing traditional construction methods, quality manufacturing and third-party agencies who offer arbitrary inspections, testing, and certification solutions for quality control, commercial modular structures are made in strict accordance with appropriate local, state, and national rules and regulations. On account of the requirement to transport modules to the final site, each module has to be constructed to independently withstand traveling and installation requirements. Thus the final module-to-module meeting of independently durable elements can yield a final product which is stronger than site-built structures. SIPs panels are a light yet lasting mix of board and closed-cell polyurethane (PU) or expanded polystyrene (EPS) insulating foam. They are air-tight, and as such provide exceptional thermal performance. They also offer superior damp 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 designed to match in with external aesthetics of any existing construction and modular units after assembled can be almost indistinguishable from a site-built construction.
Modular construction may also give an edge in similar categories from the International Green Construction Code.
Environmentally friendly construction process. Modular construction reduces waste and site disturbance compared to site-built structures. The controlled environment of the factory allows for more accurate construction when permitting the additional stuff to be recycled in-house. 
Improved Air Quality - Many of the indoor air quality problems identified in new construction result from elevated moisture levels in the farming materials. Because the modular construction is substantially finished in a factory-controlled setting utilizing abrasive materials, the prospect of elevated levels of moisture being trapped inside the new construction is eliminated.
Ability to support remote locations. Especially in countries in which prospective markets might be found far from industrial centers, such as Australia, there may be much higher costs to construct a in-house property 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 at which time, space, and money are a problem.
Speed of construction/faster return on investment. Modular construction permits for the construction and the site work to be completed concurrently. According to some materials, this can reduce the overall completion schedule by up to 50%. This reduces labour, financing and supervision costs. To save even more time and money, the majority of design and engineering disciplines are a part of the production procedure. During site-built structure, walls can't be placed until flooring are in position, and ceilings and rafters cannot be added until walls are erected. On the flip side, with modular construction, walls, flooring, ceilings, and rafters are all constructed at the exact same time, then brought together at the same factory to form a building. This process can enable modular building times of half an traditional, stick-built construction.
Indoor construction. Assembly is different from weather, which may increase work efficiency and avoids damaged construction material.
Low waste. With the very same plans being continuously built, the manufacturer has records of precisely what amount of substances are needed for a given job. With the consistency, most builders can design systems which use common lengths of timber, wallboard, etc., cut things with maximum efficacy, or have the ability to order special lengths in bulk. While squander from a site-built dwelling may typically fill several big dumpsters, construction of a modular dwelling generates much less waste. According to the UK group WRAP, up to a 90% decrease in materials can be accomplished through the use of modular construction. Materials minimized include: wood pallets, shrink wrap, cardboard, plasterboard, wood, bricks, concrete, and cement.