You have 6yrs CGT free exemption, provided you don't own another PPOR in that same period. So you have six years after moving out and renting your house out to sell without inncurring CGT, but you are not allowed to have ownership of more then one house which you are claiming as your Principal Place of Residence for CGT purposes at any one time (although there is an exception if you sell your house within 6months of purchasing the new residence)