I am looking to buy home theater seating. Three seats in the price range of 1000-1300. The question I have is that my clearance going down my stairs is 35 inches wide and the door opening is 30" wide. I cant find unassembled dimenions? Can someone help

Most high quality chairs come apart and you assemble them in place.

If you're talking berks, they will fit easily.

I’d look around real HARD because that is a silly amount of money for seats! I bet you can find the real deal the Real McCoy cinema seating second-hand for roughly $40 or $50 dollars if looked real hard!