I charge £150 a day regardless so if they want me stripping paper its £150.if it only takes me 1/2 a day its £150 why should i lose 1/2 a days money cos they cant be arsed to prep.i also charge for removing rubbish or they can tip after all its their rubbish.get a price for all your materials +,add some to cover fuel.what you want per day calc how many days then add an extra incase.