We cover any deterioration in the performance of the installation that is a result of a poor workmanship. We want the work we have carried out to stay hassle free for you for many years and we do not want the added costs of coming back. Purchasing what appears to be “good value” or “cheap” products does not always work out. If cheaply manufactured products fail, then the cost of replacing them once an installation is complete can be substantial, this would not fall under our warranty. We will only guarantee our own products as we have gone to great lengths to select the right product for our range. We do not cover issues caused by excessive wear and tear, misuse of products, poor maintenance or care, or DIY work deemed to be carried out by others. If you need any modifications carrying out during the warranty period please inform us first to ensure this work will not affect your warranty.