Abstract: An area between a wall and a floor of a building can be covered by a baseboard molding unit of the present invention. The baseboard molding unit of the present invention includes a wall-mounted track section that can be fixed to a wall by fasteners and which includes a dovetail joint element and a baseboard element that has a dovetail groove defined therein that is slidably, yet securely held on the dovetail joint element. Corner pieces are used for inside and for outside corners.