あと高さ制限などもありますので、10～12メートルまでの家しか建てられません。
各斜線制限も合わせると、うちの場合3階はちょっとムリかなというかんじですね。
容積率80%の土地でもトータル120%の家が作れる『地下室』という手もありますが、めっさ予算がかかるのでムリでした。

京都など、さらに景観条例があるところは外観の規制もあって大変そうです。

There's height restrictions and such as well, so houses can only be built up to 10-12m tall. Together with the various setback-line limits, it was like a third story was just out of the question in our case. Even on a lot with an FSI of 80%, we had the option of a basement level, which could make a house with a 120% total FSI, but it would've taken a massive budget, so it wasn't possible.

I hear it's even rougher in places like Kyoto that have scenery ordinances, where they've also got exterior appearance restrictions.