If you need door installation or replacement, your local Home Depot installers can help. Choose from multiple styles and materials for your interior and exterior doors..Average cost to install an entry door is about $ $ prehung aluminum door, with removal of the old one . Find here de.ed information about entry door installation costs. Average cost to install an entry door is about $ $ prehung aluminum door, with removal of the old one ..The cost to Install an Exterior Door starts at $ $ per door, but can vary significantly with site conditions and options. Get fair costs for your SPECIFIC project requirements. See typical tasks and time to install an exterior door, along with per unit costs and material requirements..How much an exterior door should cost. Average costs and comments from CostHelper’s team of professional journalists and community of users. A plain front entry door starts at about $ $, depending on size and materials, or $ $ with installation..