Is it legal for the property to forcibly close the balcony at the specified time?

First, whether it is legal for the property to forcibly close the balcony at a specified time depends on whether the renovation time required by the property is reasonable. Generally, it is impossible to decorate after 8 am and in the afternoon 10. If you think that the property management requirements are unreasonable or have objections, you can report them to the property management office of the local housing authority.

Second, according to the "Property Management Regulations"

Article 35

The realty service enterprise shall provide corresponding services in accordance with the stipulations of the realty service contract.

The realty service enterprise fails to perform the realty service contract, causing personal and property safety damage to the owner, and shall bear corresponding legal responsibilities according to law.

Article 45

The realty service enterprise shall stop the violation of laws and regulations such as public security, environmental protection, property decoration and use in the realty management area, and report to the relevant administrative departments in a timely manner.

After receiving the report from the realty service enterprise, the relevant administrative department shall stop the illegal act or deal with it according to law.