The cost to replace the bottom seal on a garage door can vary depending on several factors, including the door size, the type of seal you choose, and whether you hire a professional for the installation. On average, the cost for a standard bottom seal replacement can range from $50 to $100 for the seal itself. If you opt to have a professional technician install the seal, you can expect to pay an additional labour fee, which may range from $85 to $250 or more, depending on your location and the complexity of the installation.