We live in a duplex unit, we are the apartment on top of a house, we applied for planning to convert the attic space and have a doormer constructed, the mgmt co insisted on letters from our neighbours saying they have no objections to the works now the family below are being extremely difficult and will not provide a letter as they say it will be too noisy which holds no weight because its to be carried out during work hours, the planning application is as good as granted with no objections so my question is if we cannot get this letter can the mgmt co stop us? as we signed a covenant of lease, I think its called when we bought the apartment which stated that we need the mgmt co expressed permission to alter the building, but surely they cannot stop us if its not a legitimate objection/concern; is that not what planning is for? thank you.