Severn's housing runs younger than a lot of what we see closer to Columbia - median build year here is around 1997, versus a 1976 median across the wider service area. That twenty-year gap matters more than it sounds. A 1997 build almost always came with a steel sectional door on a factory-installed torsion spring and a chain or belt-drive opener already wired in, not the older extension-spring setups or side-mounted torsion hardware you find on 1960s and 70s stock. The failure points are different too: on these doors we're usually looking at worn rollers, opener logic boards, and torsion springs that are finally hitting the end of a 15-20 year service life, not the seized side bearings and undersized track common on older houses. With 21,318 households in the area, that's a lot of doors sitting right in that spring-replacement window at the same time.