New kitchen & bathroom - building permission; syndicat; co-owners...

Hello,My wife and I are (finally) getting a new kitchen and bathroom fitted in our apartment. The plans are all finalised, it is just a case of signing  and of course paying the deposit, before all the work gets underway.The only concern I have is what steps are necessary - do you need any permission to remodel a kitchen/bathroom ?What is the standard procedure for the co-owners/residents ? Another owner of an apartment recently renovated their entire living space and put a notice up signalling the start of the works in one week's time. Is this normally all that is needed ?Is there another step to go through with the syndicat as well ?Any advice would be appreciated!Thanks - Matt