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You will also have to look into planning permission. Siting depends on if in a garden area or a field(commercial or domestic), size and how near a road , there may be other factors in different situations to consider as well.The planning people were very helpful to me and as I did not need planning after a drawing of site and size of polytunnel was given to them they sent me a letter confirming this. I am refering to the large tunnels ,small tunnels I am not sure about

If your polytunnel is well sheltered you can use them all year round . Summer for veg , Winter for cuttings and herbs. Some polytunnels can be stripped for winter but I keep mine on. They are worth every penny go for it! All are different I went for a First Tunnel as you can design your own on line. They also have storm fittings and crop bars etc which all add for stability.