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. 2012 Oct 24;9(11):3770–3788. doi: 10.3390/ijerph9113770

Table 4.

Calculation of benefit-cost (B/C) ratios, for the two demonstration projects with differently sized green walls—3 m high and 19.2 m high, assuming a green wall unit price of 0.5 EUR (2010) per m2 per person per year.

Measure Size Benefits Costs BC ratio
Green wall, 3 m façade opening 58 m2
Investment costs 3,301
Maintenance costs 1,450
Noise attenuation benefits 1,932
Amenity/aesthetic benefits 4,234
Total 6,166 4,751 1.30
Green wall, 19.2 m façade opening 369 m2
Investment costs 20,999
Maintenance costs 9,225
Noise attenuation benefits 1,761
Amenity/aesthetic benefits 29,674
Total 31,435 30,224 1.04