Apps like this, and quite frankly developers like this should not be allowed in the store. first, if the app is interrupted for any reason (ie. it sleeps), even if you dont exit, your work is deleted and you are told you have to upgrade to save. second, when drawing walls you cannot set the exact length, nor can you see the length of the wall as you drag it, making drawing rooms wall by wall excessively painful. stick with pen and paper!
RoundMidnight about House Designer