Renovate or renovate the apartment
Keep in mind that permission is required if you want to take certain steps in your apartment such as, for example. moving kitchens or drains, etc. There may be problems with, among other things, ventilation and heat that affect others in the house. Read more about what requires a permit under Rebuild.
In some cases, a building permit or building registration is required to the municipality. You who want to rebuild are responsible for this being done. Risk is that you may recover if you missed this.