If you get bumped due to overbooking you will get compensation under eu261/2004 rules. Any other expenses you won't be able to claim back (non refundable hotel, airport parking etc.) but your insurance may cover those. No airline is liable consequential costs such as separately booked hotel, car etc.
How often does easyJet overbook flights?
Like many airlines, easyJet routinely sells more tickets than there are seats on the plane for popular departures. The airline says its typical no-show rate is 5 per cent, or an average of nine passengers for each full flight.