I was a little worried about that, too, because several of the hoarding sites talk about having rooms that can't be used for their intended use.
We have a 4-bedroom house. Two of the bedrooms are for storage. However, for us, that *is* their intended use (we bought the house with that use in mind). The house has no attic, and we plan on renting out the basement, so those two bedrooms are our major storage areas. One room is completely packed out, with neatly-stacked and labeled boxes of things that are not for long-term storage and aren't for frequent use (large baby items like the bassinet and swing, etc., when right now we're between babies). The other room is lined on two sides with large plywood shelves that are full of storage bins, with a third wall having some boxes that don't fit on shelves. The center of the room is available for use, though, and it serves as our "guest room" (we keep the air mattress there and the sheets/pillows in the closet of that room). So while you could say that neither is serving its intended use in terms of a bedroom, they're both serving *our* intended use for them.
We do have an exit that is occasionally (okay, more than occasionally) blocked, because it's the garage door, and it comes off the laundry room. The laundry room having very little floor space, I often end up having laundry all over the floor and it's annoying to get to the exit. But we don't use that exit before, because our garage is not a garage. Not our fault, due to modifications by the previous owners (cutting off one end of it to install said laundry room), the garage is no longer deep enough to fit a vehicle. So on our paperwork for our house, it's listed as an "attached shed." Heh. Eventually my husband would like to fix that, so we can sell the house as having an attached garage, but not yet.