Houses made of wood.

Wood rots from staying wet. Properly constructed with enough air space for drying wood can get soaked over and over again as long as it dries out in between. Houses, barns, and other wooden structures over 100 years old are common, some are a lot older than that. There’s a Quaker Meeting House nearby made of rough hewn timbers that’s over 200 years old, and several timber frame homes older than that. Some woods like cedar and cypress are much more rot and insect resistant than others. Modern composite materials aren’t expected to last that long.

Some wooden buildings in Japan are well over 1000 years old. If you can keep fire away and a good roof on it, there’s no reason a well-constructed wooden building can’t last indefinitely.

Its mostly brick in the U.K.

Digged-out “troglodyte villages” are still in use in Spain, although nowadays it’s mostly as summer homes (there’s even hotels; the village where that hotel is didn’t have any “built” buildings except the church until the 1960s). Some of them are in zones where less-diggable villages had “one-room-on-top-of-another” adobe houses in pre-Roman times.

Many perfectly habitable homes here in New England that were built before the American Revolution. There are more than 80 homes older than 200 years in my hometown right now. And virtually all of the new ones being built today are wood frame.

I am well aware that houses were built of stone and other products, and never heard of earlier buildings made of wood. I imagine there may have been some, but it would seem wood may have come before the other products, after humans left caves, they may have (like American Indians used wood for a base for the teepees

One would think so.