We have found a builder which we like. he seems great. but a friend has been asked by him for 37% up front with only 4% left to pay for after it is apparently finished. I can sort of think it might be reasonable to pay that much up front (though around 25% might be better) but i would want to leave at least 25-30% to pay after the job has been completed to our level of satisfaction. I understand re getting materials and needing to pay mortgages etc but they could walk off the job never to return once they have a substantial proportion of the fees, surely? anyone have any experience of this to enlighten my friend and me?