Earlier quoted context omitted.
> Well, I know the reason is to prop up the value of their homes Yes, but not in the way you expect, which is why your comparison fails. In many cases, its not to prop up the market value of their homes, but the features of the community which supports the personal value they place in their homes: its "I live here, and I'd like to keep it the kind of place it is that led me to choose to live here".
For more recent buyers I'll bet the market value piece is pretty high on the list. If you bought in the last couple of years while things have been increasing, you want to see that trend increase. If suddenly prices drop because there's a ton more dense housing (which also impacts the other desirability factors of the neighborhood), you could easily be underwater on your $1M+ mortgage. Given the amount of money at st…
But you're making a huge logical jump to say that building housing could magically slaughter my house value and that I'd be underwater because of it.
I'm worried about being underwater because of a recession or cyclical trends or tech jobs wholesale abandoning the area, or any number of things.
The LAST thing I worry about is housing being built so fast that it'll tank the value of my house. It simply won't. If there's enough continued demand for housing, by all means, build, build, build. It means neighborhoods will get more vibrant. I see no scenario where building will tank my house value (short of building and THEN a recession).
I don't think people worry about growth hurting their home value. I agree with others here that they worry about the impact on what THEY value in their neighborhood, but most people aren't looking to sell their primary residence so a temporary slowdown in the growth rate of the equity is simply not on their radar as an important matter.