Is it illegal for employees of property companies to use their spare time to do engineering work inside the company?

It is not illegal, it is legal. However, it needs to be clear that the company will terminate the labor contract if the on-the-job employee suffers a little loss from part-time work.

1. According to the relevant laws and regulations of our country, after signing a labor contract with the company, employees should provide labor services for the company as required and abide by the relevant rules and regulations of the company.

However, it is not illegal for employees to take part-time jobs in their spare time. Spare time is arranged by employees, and employees can do what they want in their spare time. As long as it does not affect your work, you can freely arrange rest time.

3. However, if an employee works part-time outside the home, which damages the company's interests, the company can ask him for compensation.