The purpose of the present investigation is to study physical and chemical hazards in the workplaces in additional to Indoor Air Quality (IAQ) within the administration areas. Noise, dust, vibration, heat stress, and illumination were examined in the New Assiut Barrage Project, Egypt. The project is established to enhance irrigation, economy, and development with estimated energy production of 32 Mega Watt. Average measured values of Physical and chemical factors for noise, Total Suspended Particulates (TSP), PM10, and vibration were 79 dB (A), 7 mg/m3, 2.1 mg/m3 and 6.4 m/s2 respectively. IAQ was evaluated by testing the concentrations of PM10, temperature and relative humidity in the offices additional to noise and illumination. Risk assessment of the workplace was carried out to assess the most important hazards that may threaten worker's health. A simple/flexible modified risk assessment model was used in this study to evaluate the occupational hazards caused by chemical and physical factors. The model is divided mainly into two models; based on workplaces factors and IAQ in enclosed areas. Each model has five segments from No risk to Not allowable risk according to the measured values and hazard type. The results of the risk assessment are used to avoid the negative effects of the workplace on the employees as well as to assess the comfortable degree in the administration areas.