How many house expansions are there in Wild World?

1st expansion: 19,800 bells [6x6]

2nd expansion: 120,000 bells [8x8]

3rd expansion: 598,000 bells [second floor]

4th expansion: 728,000 bells [left room]

5th expansion: 848,000 bells [right room]

6th expansion: 948,000 bells [back room]

A grand total of 3,261,800 bells. 3 million. That's a ton of bells.