Contact: [email protected] and ask him about the warranty. I just emailed him but you could too. Mark is a great guy and VERY helpful. I've visited the factory twice and have seen their products. We found the pricing between Marvin and InLine to be comparable. InLine windows are totally custom. The sliding doors and "European" style doors (tilt and turn) are more standardized, in terms of dimensions. The windows are custom sized to within 1/16 inch. You do need to be aware that the windows are priced out "ala carte"....meaning, the base price is just the windows. You have to pay extra for the brick mold, the wood interior trim, more if the wood is finished, extensions, etc. The advantage is that you can get the outside one color and the inside another if you like. I am still convinced InLine has a better product but it is a bit confusing/ complicated if you are used to the simplicity of ordering the "usual" Anderson-type windows. We are getting double glazed. We ran numbers regarding triple glazed and the energy savings just doesn't justify the cost (we are on a very tight budget). There are theoretical advantages to triple glazed....less air movement/convection so you can put chairs closer to the windows and be comfortable. However, estimated heat cost doesn't drop all that much with triple pane (our estimate was $50 per year in a very cold climate). I believe that InLine is working with Aspin (perhaps) windows out of Colorado which is nationally recognized (in the States) for their windows and I think InLine is providing a lot of Aspin's windows. If you live near Toronto, ask Mark for a tour. They have a display area so you can see and operate the windows plus he'll take you on a tour of the factory. It's near the airport. Cathy