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1. Definition of a valid energy performance certificate Member States shall provide a clear definition of what is considered to be a valid energy performance certificate. The definition of a valid energy performance certificate shall ensure:

(a) a validity check of the input data (including on-site checks) of the building used to issue the energy performance certificate and the results stated in the certificate;

(b) the validity of the calculations;

(c) a maximum deviation for the energy performance of a building, preferably expressed by the numeric indicator of primary energy use (kWh/(m2.y));

(d) a minimum number of elements differing from default or standard values. Member States may include additional elements in the definition of a valid energy performance certificate, such as maximum deviation for specific input data values.

2. Quality of the independent control system for energy performance certificates Member States shall provide a clear definition of the quality objectives and the level of statistical confidence that the energy performance certificate framework should achieve. The independent control system shall ensure at least 90 % of valid issued energy performance certificates with a statistical confidence of 95 % for the evaluated period, which shall not exceed one year. The level of quality and the level of confidence of the independent control system for energy performance certificates shall be measured using random sampling and shall account for all elements provided in the definition of a valid energy performance certificate. Member States shall require third-party verification for the evaluation of at least 25 % of the random sample when the independent control systems have been delegated to non-governmental bodies. The validity of the input data shall be verified with information provided by the independent expert. Such information may include product certificates, specifications or building plans that include details on the performance of the different elements included in the energy performance certificate. The validity of the input data shall be verified by on-site visits, which may be carried out by virtual means, where appropriate in at least 10 % of the energy performance certificates that are part of the random sampling used to assess the overall quality of the scheme. In addition to the minimum random sampling to determine the overall level of quality, Member States may use different strategies to specifically detect and target poor quality in energy performance certificates with the objective to improve the overall quality of the scheme. Such targeted analysis cannot be used as the basis to measure the overall quality of the scheme. Member States shall deploy pre-emptive and reactive measures to ensure the quality of the overall energy performance certificate framework. Those measures may include additional training for independent experts, targeted sampling, obligation to re-submit energy performance certificates, proportional fines and temporary or permanent bans for experts. Where information is added to a database it shall be possible for national authorities to identify the originator of the addition, for monitoring and verification purposes.

3. Availability of energy performance certificates The independent control system shall verify the availability of energy performance certificates to prospective buyers and tenants in order to ensure that it is possible to consider the energy performance of the building in their decision to buy or rent. The independent control system shall verify the visibility of the energy performance indicator and class in advertising media.

4. Treatment of building typologies The independent control system shall account for different building typologies, particularly for building typologies that are most prevalent in the real estate market, such as single residential, multi-residential, offices or retail.

5. Public disclosure Member States shall regularly publish, on the national database on energy performance certificates, at least the following information on the quality system:

(a) the definition of a valid energy performance certificate;

(b) quality objectives for the energy performance certificate scheme;

(c) results of the quality assessment, including number of certificates evaluated and relative size to the total number of issued certificates in the given period (per typology);

(d) contingency measures to improve the overall quality of energy performance certificates.