Is it permissible to build temporary internal walls to obtain multiple electricity meters to avoid high bills, with the intention of removing them later and before habitation, for a house designated solely for the family's private residence?

The electricity company's contract is a lease contract for a permissible utility. If the company stipulates specific conditions for providing the service, such as the presence of a separate meter for each apartment, then it is obligatory to adhere to this condition. What you intend to do is a violation, deception, and circumvention, so it is not permissible for you to do it.