I'm going to "rain" once again.
I had another thought. When the boys first started playing, we tried to start them in the habit of playing in their room with the bell of their instruments pointing into their closet. That worked pretty well to insulate sound. However, they wanted to be in the main area of the house with us.
Even now, when my 19 year old is home, he brings his trombone out into the main room, sets up his music stand, and plays away. When my 21 year old comes, he might play guitar quietly in his room, but his trumpet also seems to require the main room. Apparently musicians like an audience.
At this point, I enjoy it, but they're only home occasionally!
So, think about your kid's habits. Are they more likely to play privately than mine?
Also, in defense of the idea of moving. If your kids have good educational opportunities nearby and might be likely to continue living at home during college, your plan does make sense. For us, that wasn't a possibilty and we knew we would be paying not only tuition, but living expenses elsewhere.

Even now, when my 19 year old is home, he brings his trombone out into the main room, sets up his music stand, and plays away. When my 21 year old comes, he might play guitar quietly in his room, but his trumpet also seems to require the main room. Apparently musicians like an audience.

So, think about your kid's habits. Are they more likely to play privately than mine?
Also, in defense of the idea of moving. If your kids have good educational opportunities nearby and might be likely to continue living at home during college, your plan does make sense. For us, that wasn't a possibilty and we knew we would be paying not only tuition, but living expenses elsewhere.