The app provides a survey to evaluate IEQ measures such as temperature, humidity, air freshness and overall satisfaction. The app enables collecting IEQ data for hierarchically clustered functional spaces in various buildings. The building occupants can submit their perception about the IEQ measures of individual building spaces through the app. The app will be used as on retrofit projects in Brunel University in the UK in collaboration with RMIT University in Melbourne. The building evaluation data based on the classification enables comparison of wide range of data collected from general public.