For a VW T5 | T6 campervan we would recommend ordering roughly 10 metres of lining for a Short wheel base van and 12 metres for a Longwheel base. That's without headlining. If you want to include headlining, just add a couple of metres extra on. You will also need some high-temperature adhesive and the best formula we have found is to work on 1 can per metre length of carpet. (https://www.kiravans.co.uk/high-temperature-adhesive.html)