Hi essy, sorry to hear of your dramas. There are 2 angles to this. One is owner responsibility to abide by by-laws, so read those and take action that fits under that where you can. The other is the owner’s committee which is responsible to oversee and getting stuff done that affects the whole of building. If they dont do stuff you can chase these things down during the year, but sometimes your best chance is to put in a Motion for all owners to vote on at your next AGM (or EGM if there is enough owners up to call for one). As for shared costs you unfortunately are in for a penny in for a pound.