TC – to facilitate advice, it seems that your Executive Committee is coordinating the renovations, but can you please advise how the decision to undertake those was made? On the face of it, it seems that decision should have been by all Owners at a General Meeting of the Owners Corporation, possibly by a Special Resolution as the works involve changes to the Common Property, where you could have raised the issues now given in your post.
A little more background on that please.