Earlier quoted context omitted.
Huh? I have a 650sqft house, it costs 430K in a small town. I looked at building a new place, it would cost roughly the same to hire a building team to make it - not to mention years of waiting on development. The land is fairly affordable if I buy a little bit out of town. It's the cost of building that is stopping me.
If I look at the value of the place where I'm living, a bit more than 2/3rds of it is attributable to land instead of structure. This ratio will change depending on whether you have a multistory structure on a small plot of land, or a SFH with a yard on a larger plot, but land/value ratios > 50% are typical.
My current place would sell for say $1.4M or so.
The lot itself is worth around $600-700k if it was empty.
A similarly sized home would cost well over $1m to construct to similar quality levels - normalizing a bit for modern construction techniques and all that.
So about $2.4m to build new, or $1.4m to buy a fairly similar 25 year old home next door. New construction here costs more than the older structures on the land in most cases. This ignores permitting and financing costs which throws a light wrench into those calculations, likely making it a bit more expensive on the build side.
That is using numbers I would pay a custom builder for, but even if you add in 20-30% profit for the builder the math isn't super great for the new build end of things.