no you dont have to give an invoice to domestic customers but a few may ask for one, when we tell people its including vat they occasionally say well can we have a reciept (theyu may not belief you) so when you say yes they are usually surprised and say it doesnt matter about reciept, as for amounts they have to be calculated in, but if you have a street worth £40.00 then put it down as complerte street and not per house as it will still work out the same