14.

‘cost-optimal level’ means the energy performance level which leads to the lowest cost during the estimated economic lifecycle, where: the lowest cost is determined taking into account energy-related investment costs, maintenance and operating costs (including energy costs and savings, the category of building concerned, earnings from energy produced), where applicable, and disposal costs, where applicable; and the estimated economic lifecycle is determined by each Member State. It refers to the remaining estimated economic lifecycle of a building where energy performance requirements are set for the building as a whole, or to the estimated economic lifecycle of a building element where energy performance requirements are set for building elements. The cost-optimal level shall lie within the range of performance levels where the cost benefit analysis calculated over the estimated economic lifecycle is positive;

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Source: EUR-Lex (Cellar) · retrieved 2026-10-28 · Text as adopted (Official Journal); later amendments are not incorporated in this text.