Do you need to re-register a house that was...?

You don't need to redo it yourself. That is, after buying an object of immovable property, it is not necessary to order a new technical passport, you can continue to use the data of the technical inventory that was carried out earlier.

A note about the change of owner is made (at your request) on the technical passport (this is not mandatory). During the transaction, as a rule, from the new owner, the notary receives a statement of agreement with the technical conditions of the object specified in the technical passport, and the transaction is carried out according to the old technical passport. Conducting a technical inventory with drawing up a new technical passport is required in case of re-planning, changes in other technical conditions of the object.