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To do this you have to pay of the mortgage for your house. Then, if you go to Tom Nook's shop he will talk to you about paying off your mortgage and you will be able to upgrade your house. This will come with a bigger mortgage. If you pay off this mortgage you will be able to upgrade again. You can repeat this cycle a few times until your house is fully upgraded. This may take a while.

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14y ago

What else can I help you with?