Wood frame house living health, what should be considered?

Then just ask the neighbors. I would always ring the neighbor's door after the first viewing and before the second to get a feel for the atmosphere... here with the semi-detached house, they could even answer your questions.

Well, either he knows or he’s the wrong person in terms of expertise.

Although it probably won't be the semi-detached house anyway, the real estate agent somehow puts pressure on making a quick decision. I'm not really in the mood for that.