Aldaron, That's what I was thinking. JC, If you made the house out of solid cubes there is no way a boolean will work from the inside ... unless... if that's what you did, duplicate the house, make the xyz's of the dup a little smaller and group the outside(+) bool to the inside(-) bool. Then you'll have to seperate out the window and boolean a hole(-) the size of the window to the house group(+). then insert the window into the hole and optionally group both(+). - TJ