Absolutely correct Vic, but your example is a bit extreme and you would be unlikely to win that one. However it may not be plain sailing for And1 either. In law, you have a right to insist that the supplier meets any costs associated with putting you back to the position you would have been in had the fault not been present. however in practice it is a bit more difficult. I would suggest that any reasonable company would make some contribution towards your costs. For example if you did the work yourself then you could ask them to pay a reasonable hourly rate. Don't be greedy, or rude - you will just make life more difficult for yourself. Also they have a simple getout if they could demonstrate that you, or more likely, a competent tradesman, should have spotted the fault earlier, or even before beginning the job. If I was them, that is how I would get out of it, or at least limit the damage. Remember though, as a very minimum, they must replace or refund on the faulty item, IF IT IS FAULTY. It is most definitely worth telling them that you expect them to contribute to your other costs in addition.