I believe it's 5x3, but also leave space for the doorway in front, so that's around 3 blocks of unusable space. I think that's what you mean right? It should take up the same space as a house that isn't fully expanded.
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But please wait for someone to confirm what I said!
Thank you! My current house is 5x3, I suspected maybe the dimensions wouldn't change past this point. The only thing I'm mainly worried about is width, 5 would be great - thanks for the response