Mount Pleasant's median household income runs lower than the wider Columbia service area - about $49,897 here versus $70,163 across the territory - and that's part of why we don't push full door replacement when a roller and track job will get another decade out of the same steel door. Nylon rollers cost more per unit than steel but last longer and run quieter, which is usually the right trade for a door that's otherwise sound. We price the job by roller count and whether track replacement is needed, not by a flat per-door rate, so a single door with good track costs less than a double needing new rails. We don't quote a number sight unseen over the phone because the track condition changes the job, but we'll give you a firm price before any work starts.