lego houses

We have figured out how they build the houses so fast here.  Besides the fact that there are no basements... the parts boards etc arrive all put together.  They just have to assemble them.  It is like they are building big lego houses.  I took pictures of the piles that arrive that within a day get put together to frame the house.  I don't know if that is what they do in Canada but around here it is common in this neighbourhood