Rebuild - How much can I rebuild?
You can repaint, wallpaper, put in new floors and similar finishes without applying for it. What you are not allowed to do is to make changes that may or may not be to another member or to the tenant association, or any other significant change.
Kitchen - Renovation, extension and relocation of kitchens requires notification and permission from the board as it can affect ventilation etc. Relocation and extension of a kitchen also requires a building registration and approval from the municipality.
If in doubt, ask for too much once rather than too little. The exterior of the apartment is responsible for the association so all changes there must be notified and approved by the association.
Other rules apply to rental apartments.