We extend a 3 year warranty on workmanship. This means that in the first 3 years your unit should not leak under normal use and it should operate properly. The reason we do not offer more than a 3 year warranty is because of all the factors involved in the long term operation of a frameless shower enclosure. Structural settling, grout cracking, and unit abuse are a few. Fact of the matter is that we strive to install a quality long lasting product in the first place so you can rest easy.