Within the European research project HOPE, 97 apartmentbuildings and 67 office buildings were investigated using checklists addressing the building characteristics and self-administered questionnaires to the occupants asking their perceived comfort (thermal visual, acoustical and indoor air quality) and health(sick building syndrome symptoms and allergies). 2703 valid questionnaires were collected in dwellings and 5992 in offices. Statistical interpretation of these individual questionnaires have shown several correlations between the presence of SBS symptoms or comfort complaints and the characteristics of the indoor environment.