The homes we see in Dunn Loring cluster tightly around 1977, which lines up with the broader build wave across the towns we cover - most of that stock went up between 1940 and 2015 with the same 1977 midpoint. That's a narrower window than some of the surrounding areas, and it matters because it means the garage doors and openers going bad right now were largely installed, or replaced once already, in a fairly consistent era rather than a mix of eras.
With 2,822 households in Dunn Loring and a median income of $236,563 - well above the $150,707 median across our whole 92,675-household service area - a lot of these garage doors have already been upgraded once from builder-grade to something heavier. That doesn't mean the hardware behind the door got upgraded with it. We still find late-1970s torsion setups holding up doors that were swapped out for insulated steel a decade or two ago, which is its own kind of mismatch.