East Renton Highlands is older than most of the neighborhoods we cover. The median home here went up around 1974, close to a decade ahead of the 1983 median across our wider service area. That gap matters more than it sounds like it should. A door installed in the mid-70s came with different spring counts, different track widths, and hinge hardware that later manufacturers stopped making compatible replacements for. The area has 4,319 households, and a fair number of them are still running the door that came with the house, or a direct swap from twenty years back that matched the original opening rather than a modern standard size. Median household income here runs $140,048, well above the $119,013 median across the full service area, and we see that reflected in upgrade calls - people replacing a working but dated door with an insulated steel unit rather than waiting for a full failure. Both patterns show up on the same street: original hardware next door to a five-year-old opener. It's not a uniform neighborhood in door age, even though the houses themselves went up in the same stretch of years.