The most significant advantage of modular construction is time savings. Site-built buildings are subject to weather conditions, subcontractor delays, waits for permits, and labor shortages. Modular buildings are built on a controlled timetable, in a factory environment. Typically a standard commercial modular building can be constructed in as little as 30 days. Time savings also occur because site preparation can be completed while the building is being constructed at the factory.

Generally, Modular construction also provides a cost saving due to standardization of the engineering process, bulk purchase of building materials and the controlled factory construction environment. As a result, a standard modular building can cost up to 15% less than a traditionally constructed building.

An additional advantage is gained in the quality of construction. A standardized construction method with skilled and knowledgeable labor means a modular building is not dependent on the vagaries and availability of the local labor market.