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Thank you for your enquiry. My name is***** you enquiry it would seem that you have done all of the right things so far. What I would also suggest is that you and the other residents of the development look to see if you have the benefit of a warranty. Usually new developments offer a 7 or 10 year warranty which covers different aspects of the development. In some cases the balcony may also be covered and this may alleviate any financial hardship for you should any repairs become necessary. I must stress that the warranty is usually a complex document with lots of different terms and conditions about what it covers. If you do have the benefit of a warranty my advice is to have this reviewed by a residential property solicitor who can provide you and the other residents with some clarification whether or not balcony repairs fall under this.