free house design download

Anyone recommend a decent but simple free house designing package I can down load?
Just need to run through some ideas before we commit our selves to an Architect and builder and thought it would give us a few ideas. A bit if fun too.
Gooooooogle has a drawing programme that includes a tutorial which helps design a generic house. Had a crack at it, meh, results weren't all that flash, although I'd sorta blame me as my design skills are shite, and I don't have the patience.
Etch A Sketch?

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