Table 1.
Value estimates, per household per year, green roof/wall †.
| Study | Year Data | Country Data | Curr-ency | Property Price | Annu-ity | Gree-nery % Value | Gree-nery Value | EUR/ Curr-ency | CPI | EUR-2010 Gree-nery Value | Gree-nery Size (m2) | Unit Value (per m2) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Peck et al. (1999) [34] | 1999 | Canada, Toronto | CAD | 230,000 | 12,599 | 10.50% | 1 323 | 0.6313 | 1.25 | 1,044 | 50 | 20.88 |
| Hunt (2008) [40] | 1999 | Canada, Toronto | CAD | 230,000 | 12,599 | 9% | 1 134 | 0.6313 | 1.25 | 895 | 50 | 17.9 |
| Gao & Asami (2007) [42] | 1999 | Japan, Tokyo | JPY | 602,400 | 32,998 | 1.40% | 8 400 | 0.0082 | 1.25 | 87 | 25 | 3.46 |
| 2003 | Japan, Kitakyushu | JPY | 73,200 | 4,010 | 2.70% | 1 980 | 0.0076 | 1.15 | 17 | 25 | 0.69 | |
| Ichihara et al. (2010) [43] | 2000 | US, New York | USD | 73,024 | 4,000 | 16.20% | 648 | 1.0827 | 1.22 | 859 | 50 | 17.18 |
| Des Rosiers et al. (2002) [41] | 1999 | Canada, Québec | CAD | 112,000 | 6,135 | 3.90% | 239 | 0.6313 | 1.25 | 189 | 50 | 3.78 |
| Tomalty & Komorowski (2010) [44] | 2010 | Canada, Toronto | CAD | 395,460 | 21,662 | 20% | 4 332 | 0.7325 | 1 | 3,174 | 50 | 63.47 |
| 2010 | Canada, Toronto | CAD | 395,460 | 21,662 | 7% | 1 516 | 0.7325 | 1 | 1,111 | 50 | 22.22 |
† Values in currency of a study are converted to Euro in the year of the study, and these Euro values are adjusted to Euro 2010 values applying the consumer price index (CPI) for the Euro zone. A discount rate of 5% and a 50 year lifetime to calculate annuity values from the property values have been applied. If the study reports annual rental values, these are put under the annuity column. The “value” is the total green roof/wall annual value for the household. Since Hunt [40] reported only a percent interval of value effects, in this paper the same Toronto property values as for Peck et al. [34] has been applied. Thus, the EUR-2010 value equals the annuity times the greenery percentage value, times EUR/currency, times CPI; and the unit value equals the EUR-2010 value divided by the greenery size (in the valuation study).