Ours was designed that way at first. Then some incompetent people turned the back porch into a bonus room. Later, some slightly-more-thorough people added a partial second story. Neither of these were done all that well in terms of heating, electricity, or attic/crawlspace access... can't imagine how they passed inspection, but maybe code was more lenient back then.

Then again, like you, I'm just happy to have a home!