I will measure the room once I get back home, but 4' 8" looks correct. It is a little narrow so you have to select a desk that is not very wide, but as you can see from the picture, it's not too much of an issue. I'm glad that I did not go too large with the warm room since my current iDK would have had been a little closer to the walls than I would have liked, making it difficult to get around the scope. I think I found the right balance for my needs with the dimensions I settled on. However, if I were a rather large person then the warm room would feel more cramped. I'm 5' 11" 185 lbs.