I've noticed this as well, and I can't seem to get it to place on a foundation to cover the ground, either. Still an amazing frickin' mod though!

I will check into this. All houses should place on foundations.

Right on. It's interesting - if I fiddle around with the ghost image, it ignores the presence of the foundation until it's all the way off the farthest edge, at which point it pops up as if it's on one... but it's off the edge. :) I picked up the Landscape Blocks mod, which I suspect will render the problem moot for my use case. Thank you so much for a beautiful mod!

I haven't found any prefabs that will sit on foundations unless you use the blocks from your other mod. They all fall through to the ground.

All the prebuilts will sit on the default foundations. Those are what i use to test in the dev kit. Though sometimes if the area isnt 100% covered for some reason it will put it down, but if the floor area is 100% foundation under it it will sit on top.