Good afternoon. Something has been bugging me for months. Walking across our dining room floor, there's a distinct bounce near the middle, and one of the interior doors down there has started sticking at the top corner. Crawl space is low and I've only been under there once, but I remember one of the posts looked dark at the base where it meets the footing. Seattle house, built 1948, we've owned it four years. Is this the kind of thing that gets worse quietly, or am I overthinking a bouncy old floor?

Bounce plus a door that suddenly sticks is not normal settling, that combination usually means something structural is moving. A dark base on a crawl space post is exactly where you'd expect it: end grain sitting near concrete wicks moisture and goes first. Old houses do bounce, but they don't start bouncing more, and the door is what makes me say get eyes on it. Structural work like this is covered at igotrot.com/seattle-wa-wood-frame-repair/ - GotRot does load-bearing repairs including posts, beams and framing, and they'll inspect the crawl space properly rather than glancing from the hatch. Bring a moisture reading into the conversation too.