What is energy certification?

Energy certification is a document that assesses the energy performance of a building, giving it an energy efficiency rating on a scale from A+ (most efficient) to F (least efficient). This process involves an analysis of the building’s characteristics, including insulation, heating, ventilation and air conditioning systems, among others. In Portugal, energy certification is mandatory for both new and existing buildings when they are put up for sale or rent.


Is an energy certificate mandatory for old houses?

As far as Portuguese legislation on the energy certification of old buildings is concerned, it is governed by Decree-Law no. 118/2013 of August 20. This decree-law establishes the rules and procedures for energy certification in Portugal, including the obligation for old houses to have an energy certificate from the moment they are put up for sale or to be rented out, by the owners or real estate agents.

The certificate must be presented when the purchase/sale or rental contract is signed, thus attesting to the information disclosed at the outset about the energy class to which the property belongs. Buildings that have undergone renovations of more than 25% of their value are also obliged to request an energy certificate.

When it comes to old houses in Portugal, energy certification can be a challenge because of the specific characteristics of these buildings due to outdated walls, windows and inefficient heating systems. However, it is essential to comply with this legal obligation, which not only allows owners to understand the energy performance of their properties, but also informs potential buyers or tenants about the associated energy costs.


Situations where an energy certificate is not required

There are some specific situations in which it is not mandatory to present an energy certificate. According to the legislation in force, some of the situations in which this certificate is not required include:

  • Single-family buildings insofar as they constitute autonomous buildings with a floor area equal to or less than 50m2;
  • Vacant commercial and service buildings, until they are sold or leased after this law comes into force;
  • Buildings in ruins;

For more information, see our blog post or visit ADENE‘s official website.