If the quality of the floor cannot be fixed, consider a u-shaped bottom weatherstrip, which can adjust to an uneven surface to create a seal. Another option to consider if the floor is uneven is a garage door seal strip. These can be purchased and applied to the floor to help fill in areas of unevenness.
Cost. The cost of a door panel replacement varies depending on different factors, such as its brand, material, and quantity (if you're purchasing a set). Typically, a set of two can cost you around $100 to $300. Labor can set you back anywhere from $25 to $100, depending on the rates in your area.