Has anyone had experience in getting council approval to concert an existing structure into a granny flat (secondary dwelling)? One of our properties in the Moreton Bay region has a workshop hat was constructed prior to the main house some time in the 60s. Apparently it was built by the old man to live in whilst he built the house. It is generally in accordance with the secondary dwelling requirements of MBRC, however it was constructed prior to any approvals were required by council. We would like to renovate for use as a secondary dwelling so need to get everything above board for council. Does any have experience with the type of approvals that we will require? It should be a self assessable application to council, so don't think we will need development approval - but possibly a 'concurrence agency response'. Is building approval required for modifications to an existing structure? Any help is much appreciated.