House
From Wild World Wiki
Your house is one of the main areas in AC:WW. It's where you will start off your game every time you boot up, it's where you will store many of your items, it plays host to the phone that lets you edit your settings, it's fully customisable with wallpapers, carpets, and furniture, and it is heavily expandable. It's also one of the places you can save your game. Your home is an excellent method of imprinting your personality onto your town and letting visitors see what you like.
House Expansions
House Expansions are available to make your house larger. When you first get your house you will be given a mortgage. When you have paid off this first mortgage, Tom Nook will offer you the chance to expand your house. This expansion will be finished by the next day, after which you will be expected to pay off another, larger mortgage. This will be repeated until you have recieved and paid for the fifth expansion.
Decorating
You can decorate and personalise your house using furniture. Different items of furniture serve different purposes. Where you place furniture can affect your Feng Shui, and thus increase your luck. And what types of furniture you place in your house can earn you points (and prizes) from the H.R.A..
You can also change the wallpaper and carpet in your house by obtaining other styles of carpet (or by designing your own).