I want to have a glass roof with a UV filter over my extension. One builder offered to do it whilst another said that it will be difficult to seal and sort out the lead flushing etc. leading to leaks and problem with condensation. The builder suggested to build a roof structure and to install the glass roof in it. It's going to look like a rood with most of it made of glass like a huge skylight. But I really want the clean look of a glass roof. Can anyone propose a solution?