This tool will show you what percentage of glazing you can have on the majority of buildings in climate zone 6 (Maps of climate zones are here).
The chart below shows a number of other glass types and shading, just click on the arrow to see the other options. Note that these results only apply to classes 2, 4, 5, 6, 7, 8, 9a and 9c.
These results are based on an imaginary building with 100m2 facades in each compass direction and were developed using the ABCB Energy Efficiency Glazing Calculator (V1) spreadsheet.
Want more glass than this? Your next option is energy modelling.