Is it illegal to install an external drying rack in Ziyufu, Hefei?

There is no violation. According to the interpretation of the Civil Code, there is no legal basis for identifying the drying rack outside the balcony as an illegal building, but the decorator shall not change the appearance of all buildings or erect buildings or structures without the approval of the Urban Planning Bureau and the residential property management office. In addition, if the owner falls from the balcony and causes casualties and property losses, he shall bear corresponding legal responsibilities.