Term of “modern methods of construction” (MMC) comes from the United Kingdom as a common name for off-site and on-site methods of construction. Modular constructions consist of three-dimensional objects known as modules (off-site methods of construction). Modules are joined together at the construction site. Currently, the construction of modular schools in Slovakia is supported by the state government. This paper presents the advantages and disadvantages of MMC emerging at the technological preparation and implementation stages of buildings, which are manifested in modular schools.