Why do kids draw houses?A house is magic. You can see the outside and it looks like a thing, but there's SO much that goes on in the inside. It is a thing you NEED, shelter, it is a thing that is vastly different from person to person. My kid thinks of homes like faces, and makes a point of houses always having windows like eyes and a door like a mouth, and why not? A face is a thing which also doesn't show all that goes on behind it.
I know, it sounds ridiculous, but if you listen to kids talk about cars on the road and the houses that you see, especially how much they want to go INTO every single solitary house that they see, you begin to understand that there is so much more to it than the outside, they are trying to understand a bit more of the wonder of the unknown.
Kids also draw a lot of things other than houses. But far as a house is concerned, maybe it's because it is the first physical space they come to know. Also maybe they are encouraged by their elders to draw houses for the same purpose. From another aspect, if we look at the houses kids draw, they often tend to have many geometrical structures. So it helps familiarise kids with shapes. The house is also the most basic elemnt of the social environment. So in a scenery that a kid draws, the house is included with the hills and trees because that is how they belong to the bigger picture, as a part of the house.