Installing a sliding window system can be a great way to improve the energy efficiency of your home. Upvc double glazed sliding windows are an excellent choice for this, as they provide superior insulation and soundproofing while still allowing natural light into the home. The installation process for these windows can vary depending on the size and complexity of the job, but there are some key considerations to keep in mind when it comes to cost. Professional installation costs for upvc double glazed sliding windows will depend on factors such as the size of the window, type of glazing, and any additional features or customization that may be desired.