Survey on Indoor Environment Quality (IEQ) in offices in Iran: Indoor environment quality (IEQ) is an important quality aspect of office buildings that should be taken in to account to find office worker's complaints and help them to promote their productivity. This study investigates the Indoor Environment Quality (IEQ) in six office buildings in Tehran (Iran) with particular attention to thermal comfort. The study is based around a questionnaire survey of the occupants in the Case Study Offices. Questionnaire: The results from this survey indicate that 25% of the respondents were thermally comfortable in their workspace in winter, and 22% in summer. The survey also reveals that the respondents in open-plan office cubicles with high or low partitions were more satisfied with the temperature, the ease of interaction with co-workers, visual privacy, personal workspace, daylight and the noise level in their workspace compared to workers in fully open-plan offices and cellular offices. They also reported an enhanced perceived productivity in comparison with these other workspaces.