A trick I use to enlarge the scrolling area is to pick a random object and drag it with the mouse in the direction I want to extend. Then undo the move and the scrollable area remains enlarged. Zoom out before dragging and it will move a great distance. That way you can work around the house without moving it.

If you really want to move the house do what hansmex suggested. One addition: If you have multiple levels there's a menu option under Edit: Select all at all levels. Do that selection and then use the plugin move function to move the whole house.