Is it wrong to want a bigger house? It feels like showing off.

The guilt usually isn't about the house anyway. It's about being seen to have money, by people whose opinions you can name. That's worth noticing, because an imagined audience makes bad decisions in both directions — the monument bought to prove something, or the too-small place bought as an apology for the number. Neither one is you deciding.

This is a major life shift, and the square footage doesn't change that. Take the time to figure out what you want, not what looks right from the street. When you want to walk through it with someone who has no vote, just call.