Rowland Heights carries a median build year of 1976, which puts it a full generation past the 1959 median we see across the wider service area. That gap matters more than it sounds. A house framed in 1976 came with a garage built to a different set of assumptions than one framed in the 1950s - wider door openings for the two-car layouts that were becoming standard, steel sectional doors instead of the older one-piece swing-up slabs, and openers that were just starting to show up as a factory or early-retrofit option rather than an afterthought. With 15,011 households in Rowland Heights, that's a small slice of the 274,200 owner-occupied houses across the whole area we cover, but it's a fairly consistent slice - most of this neighborhood went up in the same building wave, so the doors and hardware tend to fail in the same ways at the same age, rather than the scattered mix of eras you get closer to the older parts of Pasadena.