The insurance need not cover improvements and betterments to the units installed by unit owners, but if improvements and betterments are covered, any increased cost may be assessed by the association against the units affected.
Common elements include fixtures located within the unfinished interior surfaces of the perimeter walls, floors, and ceilings of the individual units initially installed by the developer. Common elements exclude floor, wall, and ceiling coverings. "Improvements and betterments" means all decorating, fixtures, and furnishings installed or added to and located within the boundaries of the unit, including electrical fixtures, appliances, air conditioning and heating equipment, water heaters, built-in cabinets installed by unit owners, or any other additions, alterations, or upgrades installed or purchased by any unit owner.
765 ILCS 605/12