Building category No of storeys Sawn wood Doors assessed Percent (%) Aluminium framed Doors assessed Percent (%) Sawnwood framed windows assessed Percent (%) Aluminium framed windows assessed Percent (%) Low 0 6800 99.9 6 0.1 10 186 73.5 3676 26.5 Medium 1-3 837 90.1 92 9.9 328 27.4 869 72.6 High ≥ 4 1123 90.0 125 10.0 355 21.8 1273 78.2 Total   8760 97.2 223 2.8 10 869 65.1 5813 34.9 Source: Field Data (2012)

Table 4: The trend of consumption of sawnwood and aluminium in doors and windows in different building categories.