Keller's housing stock centers on 1999, which puts most of the area's roughly 16,058 households in homes built well after the older, first-ring Dallas suburbs. Across the wider service area, construction runs from 1959 through 2014 with a median around 1999, and Keller sits right on that median rather than at either edge. That matters because a house built in the late 1990s came with a factory torsion spring system, steel rollers, and an opener rated for a heavier insulated door - not the lighter extension-spring setups you'd find on a house from the 1960s or 70s. Keller also carries one of the higher income profiles in the coverage area, at a median household income of $172,654 against $146,314 across the broader area, which tends to track with larger two-car and three-car door openings and heavier insulated panels rather than single lightweight doors. None of that means Keller doors are new - a 1999 install is now over two decades old, well past the point where torsion springs and worn rollers start failing on their own timeline, regardless of income or square footage.