Do you mean that you just write in the command line “build a house with 3 floors and a bench on the porch”?
Well, for this YOU need to already have models of the house elements from which you can assemble a house with 3 floors, models for the fencing on the porch, and of course a model of the bench.
Then YOU need to write an algorithm (using, for example, PCG), which can assemble a ready-made house from models of walls, windows, doors, roof (you need to write that the walls need to be placed at a distance of “X” from each other, in the corners they must be turned 90 degrees, if there are several floors, then the roof must be placed on the last one, etc.).
Then YOU need to TRAIN the AI into which settings of YOUR generator it should convert user requests.
This is what a rough plan for implementing such an idea looks like in my head (or am I just not understanding the capabilities of AI today?).
I seriously doubt that one person, especially a newbie, will be able to do this in such a short time…
You might be able to generate one type of house from 10 parts, but it seems far from what you initially imagined.