Energetic diagnosis is “a systematic procedure to provide an adequate knowledge of the energy consumption profile of a building or group of buildings, or an industrial activity or plant or public or private services in order to identify and quantify the opportunities of cost-effective energy savings and to report on the obtained results “(Italian Legislative Decree 115/2008).
What is an Energetic Diagnosis?
The energetic diagnosis reports the actual consumption of the subject under study, under operating conditions, in order to allow rational use and proper energy management.
In which cases an Energetic Diagnosis is mandatory by law (according to Italian Law)
According to current legislation, diagnosis is mandatory in the following cases:

  • Public buildings: Art. 13 of Legislative Decree 115/2008 provides for the obligation for public buildings or buildings for public use in the event of restructuring of thermal installations, including the replacement of generators or building renovations involving at least 15% of the external surface of the building enclosure that encloses the heated gross volume
  • Companies: Article 8 of Legislative Decree 102/2014 obliges energy companies to identify large enterprises (companies with more than 250 people, whose annual turnover exceeds 50 million Euros or whose total annual budget exceeds 43 million Euros) and energy-intensive enterprises (companies that consume at least 2.4 GWh of electricity or energy of different sources and whose ratio between the actual cost of the energy used and the value of the turnover is less than 3%)
  • Residential Buildings: Art. 5.3 of D.M. 26/06/2015 (Minimum Requirements) imposes that in the case of renovation or new installation of thermal power generating plants rated by the generator greater than 100 kW, including detachment from the central plant, an energy diagnosis of the building has to be carried out, diagnosis that compares various solutions, including:
  • Centralized system with condensing boiler with heat accounting and thermoregulation for single unit
  • Centralized system with electric or gas heat pump with heat accounting and thermoregulation for single unit
  • Possible integrations of the above-mentioned systems with solar thermal systems
  • Centralized cogeneration plant
  • District heating station connected to an efficient network as defined in Legislative Decree n. 102 of 2014
  • For non-residential buildings, the installation of a system of automatic management of buildings and installations conforming to level B of standard EN 15232.


  • Incentivi: per usufruire di alcuni incentivi (es. Conto Termico – D.M. 16 febbraio 2016) è obbligatoria la realizzazione di una diagnosi energetica precedente all’intervento di efficientamento
  • Incentives: in order to obtain some incentives (eg Thermal Account – D.M., 16 February 2016) it is mandatory to carry out an energy diagnosis prior to the intervention of efficiency
  • Condominiums with centralized facilities: Legislative Decree 102/2014 introduces the requirement for heat accounting, making the UNI 10200 standard compulsory for the allocation of expenditure and calculating the thousandths of heating according to the energy requirements of each real estate unit. Although the current version of the standard (UNI 10200: 2015) does not have a precise reference to energy diagnosis, the latter is the only tool to ensure accurate needs analysis and a precise breakdown of energy expenditure.

In which cases an energy diagnosis is appropriate
Even in the absence of specific obligations, energy diagnosis is an opportunity to highlight defects and poor management of a building, showing what actions need to be taken to improve energy performance and significantly reduce energy consumption and expenditure.