Newer houses can have issues with mold if the HVAC is not designed or operated correctly due to the building envelope being wrapped in a vapor barrier, trapping moisture inside. Most of the housing stock is not from this time period, older houses do not have vapor barriers so they breathe a lot better.
All that being said, I’d be skeptical as hell about buying a Lennar or similar tract house built in the last 30 years for the same reasons you stated. I run union electrical work and trust my electricians to do good work, but residential construction is a whole different ballgame, lower skill levels and lots of corner cutting. I will lose money on a job to complete a project correctly, if that’s what it takes. My company has to compete locally and our reputation matters. I don’t trust the people working at home builders to make the same choice, they shit out a bunch of houses and move on, while I have to maintain my reputation and keep customers coming back for a couple decades if I want to keep my job.
Let’s just say if I was having a house built, I’d GC it myself and conduct frequent site visits, probably daily.
My main point was a well-constructed stick built house can last a long time if it’s maintained, but determining if a house is well-built is not particularly easy without cutting walls open and so on.
My main point is that modern European houses, if well built, don't need maintenance at all. The expectation if you buy a new house or renovate one, is that you won't have to do any maintenance beyond cleaning the roof gutters, for your lifetime (50 years). No siding to repaint or repair, no roof repairs, no sump pump, if there's a basement (likely not) it's fully built in cement on the sides as well.
All that being said, I’d be skeptical as hell about buying a Lennar or similar tract house built in the last 30 years for the same reasons you stated. I run union electrical work and trust my electricians to do good work, but residential construction is a whole different ballgame, lower skill levels and lots of corner cutting. I will lose money on a job to complete a project correctly, if that’s what it takes. My company has to compete locally and our reputation matters. I don’t trust the people working at home builders to make the same choice, they shit out a bunch of houses and move on, while I have to maintain my reputation and keep customers coming back for a couple decades if I want to keep my job.
Let’s just say if I was having a house built, I’d GC it myself and conduct frequent site visits, probably daily.
My main point was a well-constructed stick built house can last a long time if it’s maintained, but determining if a house is well-built is not particularly easy without cutting walls open and so on.