Have a look at the 3D site, which will give you ideas about net sizeshttp://www.3dgroundequipment.co.uk/osb/itemdetails.cfm/ID/Wooden-Single-Net-&-Pole_39The net area probably needs to be 40 yards long to allow space behind the batsman, to allow the bowlers a decent run up, and to allow the people wating to bowl space to stand safely.