Safety measures for using a building hoist in construction sites include regular inspections and maintenance to ensure the hoist is in good working condition. Operators must be trained and certified to use the hoist. Safety barriers or gates should be installed to prevent unauthorized access. Load limits must be strictly adhered to, and overloading is prohibited. Emergency stop buttons should be easily accessible. Workers should wear appropriate personal protective equipment (PPE). Regular safety briefings and training sessions should be conducted to keep workers informed about safe hoist operation procedures.