I’ve had a small extension built on the side of my house. I have vertical tiles and I’m not happy with the way it has been finished as the tiles are not level and I’ll be sitting in my garden looking at it in the summer ! My builder says he is happy with what his roofers have done. I’ve spoken to an architect, another builder and another roofer - all have said that they wouldn’t be happy leaving the job like this. The builder has said ‘We can only measure and set out from our new extension’.