The authors of the study compared the cost distribution of developing construction documentation for buildings, structures, and various work types involved in the design of combustion power plants. They used data from the state-estimated standard RBPD 81-2001-23 “Reference book of basic prices for design works in construction “Energy facilities. Energy generation” and compared it with the actual labor intensity distribution data from the design of buildings and structures at the Svobodnenskaya Thermal Power Plant (TPP). Based on the study’s findings, the authors confirmed that, to some extent, the current regulatory distribution of the unit value of work in thermal power construction aligns with the actual labor intensity. Moreover, they identified groups of buildings where this regulatory distribution is not supported by the real design data. As assumptions based on the results of the study, it is proposed by the authors to classify buildings and structures in accordance with the KKS coding system and also to supplement the existing model of distribution of the unit value of design work by buildings and structures with a dependence on the value of the electric capacity of the station.