With the contracting method, construction and assembly work is performed by special construction organizations. A permanently operating construction organization, equipped with powerful construction equipment, with permanent highly qualified personnel, is able to build quickly and efficiently. Currently, for the performance of certain volumes of construction work, the enterprise (customer) draws up a contract with a construction organization that acts as a contractor. A contractor with experience in the organization of construction works performs the work much faster than when it is performed in an economical way.
The main task of the complex is the creation and renewal of the fixed assets of the national economy. The role of the construction complex in the national economy is very significant. In Ukraine, the share of construction alone in GDP is 8%. The complex covers almost 10% of all employees in the national economy; 6% of them are in construction. Among the industries that serve the construction complex, first of all, it is necessary to mention heavy machinery, whose enterprises produce almost 2 thousand Machines, mechanisms, equipment for industrial, housing, road construction, land reclamation, communal services, as well as mining and production of building materials, among them are excavators, bulldozers, rollers, pipelayers, construction cranes, etc. This industry originated in Ukraine in the 20s. The second most important industry serving the complex is design and research. There are more than 300 such organizations on the territory of Ukraine. Without production of this industry - design and estimate documentation - construction is impossible.
One of the indicators of the development of the industry is the level of expenditure on scientific research and experimental design work (R&D). According to data on this indicator, the construction industry lags far behind other sectors of the economy. For example, in the USA, the ratio of R&D costs in the field of construction to the total volume of construction works is 0.12%, while the ratio of all R&D costs to GDP (and it can be considered in all sectors of the economy) across the country is 2.4%. A similar situation is observed in other developed countries.
The transition of construction organizations to full economic accounting (hozraschet) and self-financing requires new forms of organization and management of construction, in which administrative and command methods of leadership actually lose their force. Instead of them, economic factors begin to act: the economic independence of the contracting organization, its profitability, material incentives and incentives for all workers to reduce the construction time and increase its quality, and the like. In order to stimulate work, such forms of its organization as collective and rental contracts, the organization of construction cooperatives, joint-stock companies, concerns, and the like are used.