Economic appraisal model of green roofs in residential buildings

Green roofs are sustainable solutions, widely used in urban environments in order to diminish the energy consumption of a building and decrease the risk of urban flooding on a large scale. Numerous researches and studies have demonstrated the effectiveness of such sustainable solution, yet there are barriers regarding market uptake of these systems because there isn’t a systematic economic appraisal of green roofs which points out that these systems are also profitable. This paper intends to evaluate system and managementcosts of a green roof and above all to quantify the added value provided by green roofs to buildings. To quantify in monetary terms the impact of green roofs on the market value of a real-estate property, the criteria and the appraisal methods based on the International Valuation Standards have been used. The study, experimentally tested, has demonstrated that the increase in value of the real-estate properties provided by the green roof is greater than the installation and management costs and is, therefore, economically convenient