Well, I have some ideas, but not sure which ones to share. You don't state if it is glass or polycarbonate, or if it is a wood or aluminum frame, but I would be willing to bet at 400 pounds it is polycarbonate in an aluminum frame. If the polycarbonate is held in place with W wires, I would be concerned about losing sheets as is travels down the road. I don't know if you would have to do any interstate driving, or if it would be all back roads at a slower speed. I am coming up with a couple of ways to do this. 1)Wrap or otherwise protect the polycarbonate sheets to keep them from blowing out. 2) Remove the polycarbonate sheets carefully labeling which side is out and what location they go back in. Then you could reinstall once you are moved.

I think 4 guys could probably get a hold of each corner and lift this onto a large enough trailer. You would need to secure the greenhouse to the trailer, probably somehow involving the base of the greenhouse. I am just not sure how your greenhouse is built.

Or, you could contact building movers. A good place to start looking for one is at the portable building locations. Some of them have their own moving equipment, others job it out. But, either way they should be able to give you a name. I had a sunroom moved once this way. It was very painless. I don't even recall it being that expensive. I would have no idea what to tell you to expect in the way of charges today.

Hope this helps and gives you some ideas. Tammy

Thank you for your suggestions. It is a Grandio Elite greenhouse built out of polycarbonate panels held together by an aluminum frame - no W wires.

I am not that familiar with that particular greenhouse. I did look it up and I see that I forgot to mention one thing. You want to make sure you have your roof vents either removed or fastened down tightly. That would be a lot of pressure on them if they were open. On most greenhouses the vents slide out from the ends. If that is the case, I think I would just do that and mark them so they go back in the same place. If you have solar openers I would definitely disengage them. Tammy

Who could I hire to do the move for me?