Appauling.. I contacted them in 2020 about a door fault. There were between 3 and 5 visits to recifiy the issue. The same fault still rermains. They are refusing to fix the issue as 2 years has passed since the property was sold even though ist still the same issue. Unhelpful, shonky cowboys. Don't buy from them. I have escalated to NHBC. From a neighbour "Hi Alistair I agree that NHBC is the way forward and I hope you get it sorted out. They were very helpful when we made a claim. Avant have never been interested in customer care and finding solutions and it has been worse since Jeff Fairburn of Persimmon bought them out. He has reduced the spec and choices available greatly in their new developments and every penny is a prisoner. The more claims against Avant which have to be settled by NHBC the better really as Avant will find it more difficult to be accepted under the scheme in future." here here