Well Earl, I'm with Princess on this.
A house is a home when you furnish it with memories of your life. Sure a designer house may be aesthetically fulfilling, but it's not a home until it becomes a welcomed part of your life.
I'm still very attached to the house I grew-up in and where my mother lives now. I'm even more attached to my grandmother's house as it has been in the family for 200 years and is filled with the furniture, clothes, and personal effects of everyone who has lived there. To me, that's a home. It's not a particularly beautiful house and I haven't lived in it for any length of time, but it is my home in the sense that is filled with things and people whom I have loved and love now. Good memories abound.
The true test, I suppose, is it where you would want to live out the rest of your life and where you would wish to die when the time comes?