"Nous avons des plans de notre maison."
I think it depends whether the house has already been built or not. "for" may be for a future house and "de" for an already built house.
that makes sense, like floor plans. i understood it as plans for the house like things we hope to do in the future
I stuck with "for" our house, because I thought the context said that they had plans in place for the house and that is what they wanted to say. Being wrong, I assume this sentence means "plans" as in blueprints. "We have some plans of the house, and you can see them on these handy-dandy blueprints."
why does plans have to be plural in this case since there is only one house?