I'm glad the residents won't need to jump over the 3 polygones to get in :)
However, this is just one of the aspects of the bigger architectural point - the overall symmetry of the house. This looks like a modern suburbun house, not unlike the ones in my neighborhood. I have never seen a house with identical back and front. (And in fact the same applies to old houses, all the way back to classical architecture). If you look at any typical house you will be able to say at a glance which is the front. And if you look at the skeleton of a house, even if you cant see the house all the way to the ground, you would know which is a front door and which openings are windows.
You seem to be doing a great job in paying attention to details and a clean modelling,  but you should have the major features established first according to aesthetic& practical principles and only then chose your modelling tools(back/front symmetry may not be one of them...) and details.

"I paint that which comes from the imagination or from dreams, or from an unconscious drive. I photograph the things that I do not wish to paint, the things which already have an existence."
Man Ray, modernist painter
http://artpearl.redbubble.com/