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be up to double the cost of uPVC (Jason Palmer, 2017). Table 31. List of different retrofitting measures cost per houses type (1st approach) Source: (Jason Palmer, 2017) House types Mean cost per houses [...] cost data is collected by interviewing organisations carrying out energy-saving retrofitting (Jason Palmer, 2017). The cost of 18 measures that are applicable for improving the energy efficiency of a building [...] summarized in Table 30. Table 30. Classification of House types for cost calculation. Source: (Jason Palmer, 2017) House type Floor Area (m²) Small flat 54m² Small mid-terrace house < 76m² Large mid-terrace