We don't post a flat installation price because the honest driver of cost isn't the door, it's the opening - door size, whether the old header and framing can take an insulated panel's added weight, and whether we're replacing just the door or the door plus opener and track together. A single-car opening in an older 1980s-90s home usually costs less to finish than a double door on a newer build with a heavier insulated panel and a stronger opener to match.
What we can tell you without seeing the house: households in the Dover service area have a median income around $72,606, and most of what we install lands in a middle range between a basic single-layer steel door and a fully insulated, heavier-duty setup - we don't push everyone toward the top of that range. We quote on site, in writing, before any work starts, and the number doesn't change once we're in your garage.