It is 35 feet long, 15 feet wide, 9 feet high - the height is so important - more air space, less temperature fluctuationm as well as room for all those plants hanging up. I reckoned up the other day - 300 catts, 150 vandas, 3-400 paphs, 3-400 plants in S/H, perhaps 500 other plants hanging up - say 1500 all told...and I have a dew point cabinet elsewhere with the tinies, ex-flask in com pots. Most of the cost of growing plants in UK is heating ( or lighting - which comes to the same thing, because the lights also provide heat ) - so my hobby cost would be almost the same if I only had one plant in the middle of an otherwise empty greenhouse. But crowded like this seems to me to be natural - plants are not nicely spaced out in the wild !