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First House Upgrade:
98,000 bells to upgrade to this house
You change from a tent to a house
You just get one room
The dimensions are 6x6 squares (36 in total)
Second House Upgrade:
198,000 bells to upgrade to this house
You get a larger room
You just get a one large room
The dimensions are 8x8 (64 in total)
You get +28 squares
You get +40 storage (total: 120)
First Room Expansion:
348,000 bells to upgrade to this house
You get an extra room to the back of your house
You have two rooms
The dimensions of this room is 6x6 (36 in total)
You get +36 squares
You get +120 storage (total: 240)
Second Room Expansion:
548,000 bells to upgrade to this house
You get an extra room to the left of your house
You have three rooms
The dimensions of this room is 6x6 (36 in total)
You get +36 squares
You get +80 storage space (total: 320)
You can move your mailbox
Third Room Expansion:
758,000 bells to upgrade to this house
You get an extra room to the right of your house
You have 4 rooms
The dimensions are 6x6 (36 in total)
You get +36 squares
You get +80 storage space (total: 400)
Second Floor Expansion:
1,248,000 bells to upgrade to this house
You get a second floor (to access, go to the front of your house and go up the staircase)
You have 5 rooms
The dimensions are 6x10 squares (60 in total)
You get +60 squares
You get +400 storage space (total:800)
Basement Expansion:
2,498,000 bells to upgrade to this house
You get a basement (to access this room, go to the stairs across from your upstairs)
You have 6 rooms
The dimensions are 6x10 squares (60 in total)
You get +60 squares
You get +800 storage space (1,600 total)
After paying this loan, you can customize you house (exterior) for free
Storage Expansion:
500,000 bells to upgrade to this house
You get +800 storage space (2,400 total)
Thats pretty much it