Streamwood sits about 5 miles from our Schaumburg base, and the houses here mostly went up around 1981, a bit newer than the wider service area's 1977 median. That matters more than it sounds like it should. A house built in the early 1980s almost always has a steel sectional door on a torsion spring setup, not the older one-piece tilt-up doors you still find in towns with more 1960s stock. The tracks are lighter gauge than what came before, the hinges are stamped rather than cast, and the openers - if original - are chain-drive units that have usually already been swapped once by now. With 13,041 households in Streamwood, we're not talking about a handful of oddball houses. This is the dominant build era for the town, block after block of similar door and spring combinations installed within a fairly tight window. That consistency actually helps - we're not guessing what's behind the door panel before we get there, because the era tells us most of it already.