Several methods...
1 - The plugin AdvancedEdit has a MOVE function that moves whatever you select.
2 - If you draw walls or rooms, you can move the cursor beyond the 0,0 point of the 2D preview window (=more to the left or to the top). It works in small increments, but it's possible.
3 - Faster method: Draw a room close around the house and use EditPoints (in AdvancedEdit) to change the coordinates of the room.
4 - Start a wall at (e.g.) -500,-500. Click on WALL button, move cursor in 2D window (don't click), hit ENTER, and enter desired coordinates in the pop-up window.

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