Please remember that when we refer to a 12ft trampoline, we are referring to its overall diameter, from outer metal to outer metal. If you are thinking “which size will fit in my garden”, measure a 12ft diameter and then allow a couple of extra feet all the way around as a 'Safety Zone'.
Though we would never recommend more than one child on a trampoline, we do recognise that many customers do allow multiple users. A 12ft trampoline offers a very generous jumping area so though it does take up a fair space in the average British garden, it is well worth it if you can fit one in.