We had to have a completely new roof on our house. It was done by a registered French Artisan builder, and finished 3 years ago, since when we have lived here full time. We have some ongoing problems with the work. The worst of these is that rain leaks in along the sides of the rooves of the 2 new lucarnes (dormer windows), the mortar holding the ridge tiles is crumbling, and 3 ridge tiles have already fallen, and cold air blows in under the floor and into the 2 bedrooms in the roof and the rooms below. There are other issues too. At our request the builder came back on 3 occasions, but the problems have not been sorted. He then said that I should apply to his insurance via my insurance to have the problems fixed. My insurance say that this is not possible. I wrote and told him, but have had no reply. I understand that he is responsible for 10 years. I don't want to go down an expensive legal route. Is there some more straight forward way in which I can have the problems assessed and put right ?