Browse our range of double-glazed windows and window combinations in popular colours. Double-glazing makes great sense for thermal insulation and noise reduction. Windows come with locks and keys. Options include flyscreens and frosting. The modular window system allows you to get creative with glazing. While we recommend our range of double-glazed windows, particularly when awning-style windows suit flatpack building kits so perfectly, you can use whatever sliding or swinging windows you like with your flatpack building kit, even timber-framed windows if you would prefer.