After being away for several weeks, we came home in March to discover that our skylights were leaking! We called Velux and the sales rep/ installer came by the next evening and looked at the problem. He suggested replacement. He assured us that he would put a tarp on the roof until the windows arrived and he did. Unfortunately the weather has been horrible for anyone working on a roof and there were delays and we went away again. It wasn't until mid-May that we finally had the skylights installed. The crew were pleasant and tidy. They worked for about 8 hours to put in the skylights and replace the roof tiles. We love the skylights. The upstairs is brighter but we don't have as much heat. All in all good experience.