What is and what does the energy certificate of buildings entail?

by | 12, Jul, 2023 | Business, News, Tips

The energy certificate is that document that certifies the energy efficiency of a building or home, a document that the user who buys or rents a home from the previous owner or landlord will receive.


What is the energy certificate document?

Many users have the question of what is the energy certificate, this certificate is It is a document that is issued by a qualified professional technician in which the energy efficiency of a building or part of it is revealed. This certification is necessary for a building to be sold or rented.

The purpose of this document is so that potential future buyers or tenants can find out prior to buying the property if it has a minimum of energy efficiency. For its preparation, some reference values are evaluated so that future owners or tenants of the property can compare it based on some standards.

To calculate this energy efficiency, a procedure is carried out in which the following are analysed:

  • The available area, the shape it presents and the situation of the home.
  • The lighting and thermal installations.
  • Operating conditions and occupancy conditions.
  • The thermal envelope.


What types of energy certificate can we find?

Depending on the state of the building to be analyzed, we can distinguish three types of energy certificates:

  • The certificate of energy efficiency of the project itself ; which is a report made by a technician that includes information related to the energy efficiency of the project in progress.
  • Certificate of energy efficiency in the completed building; This report verifies that the conditions present in the completed property correspond to those contained in the project phase.
  • Certificate of energy efficiency of existing buildings, for cases in which a property is evaluated after its construction, always carried out by a technician qualified for this job.


What is the energy efficiency label?

The energy label of a home is a small graphic summary of the energy certificate itself that is obtained when the certificate is presented to the competent body in the autonomous community in question, with the label having the same useful life as the certificate; ten years.

In addition, this label details whether it is a qualification of a building in the project phase, a finished building or an existing building.

The energy label must present the following parts:


Information relating to the building

Detailing the regulations in force at the time of the construction of the house, adding the cadastral reference, detailing the type of building in question and its exact location.


The energy rating scale

It is a scale that measures the energy efficiency of the building, where values (letters) are assigned based on this, with the result being the buildings with the ¨A¨ rating the most efficient and those with the ¨G¨ rating the least efficient. .

Two factors are valued on this scale: the energy that is consumed and the CO2 emissions it emits.

The following table summarizes the values and the energy efficiency assigned based on them.


Assigned energy class

Annual energy consumption


Less than 44.6 kWh per square meter


Less than 72.3 kWh per square meter


Less than 112.1 kWh per square meter


Less than 172.3 kWh per square meter


Less than 303.7 kWh per square meter


Less than 382.6 kWh per square meter


Quantities greater than 382.6 kWh per square meter


The result of the qualification, will mark the energy that the building consumes as a minimum to cons
Follow a minimal and basic feeling of comfort. This label is important because the amount of energy demanded will depend on it and, therefore, the energy costs that arise.

Constructions that have been carried out since 2020 will have to have practically zero energy consumption, that is, they hardly need energy to maintain the feeling of comfort.

On the other hand, CO2 emissions into the atmosphere will vary depending on the type of energy consumed in the home, rather than the amount itself, so renewable energies, in this regard, are the most efficient.

The following table summarizes the values and the energy efficiency assigned based on them.


Assigned energy class

Annual CO2 emission


Less than 10 kg of CO2 per m2


Less than 16.3 kg of CO2 per m2


Less than 25.3 kg of CO2 per m2


Less than 38.9 kg of CO2 per m2


Less than 66 kg of CO2 per m2


Less than 79.2 kg of CO2 per m2


More than 79.2 kg of CO2 per m2



Registration and validity

At the bottom of the label reference is made to the assigned registration number, granted by the autonomous community and indicates the date on which the validity of the document ends.



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