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The EPC is a mandatory document that details the energy quality of a dwelling, whether it is a house or a flat. In concrete terms, to determine the energy class of a building, the. Only building experts are allowed to issue an energy performance certificate, but the property owner has the right to contact the professional of his choice. In any case, the owner has to cover the costs of the intervention himself. The supporting documents required to obtain an energy certificate depends on the nature of the work. For a new construction, an extension or a renovation, the following must be attached: 1. Building plans; 2. Details of. In the case of new buildings, the energy assessment should be carried out at the design stage: by optimizing all aspects of insulation from the. Several features are essential to improve the energy quality of a house: 1. The compactness of the building or shape factor: this is the ratio between the surfaces of the.