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Is the add() method supposed to gather the information needed to create a House object and then create an object?
When it has a House object, what is it supposed to do with that object?
What class...

Work on the methods one at a time.
What is the add() method supposed to do?


This line of code makes it look like you are copying and pasting lines without thinking:

public static void...

If the classes all derive from a common base class, you could create an array of that class:

TheBaseClass[] assets new TheBaseClass[5];

If there is no base class, the type of the array would be...