I was wondering about that. I hadn't finished changing my exterior before I started upgrading my 2nd room. Now I see that the price for the exterior changes are much higher than before. If I had known that, I would've finished the exterior first.

I just figured it out this morning. My exterior is totally finished, I just like changing things up every once in a while. All of the styles seem so cool I just wanted to see them all complete at some point.