The thing I like the most about Modern UPVC Windows is super easy online windows and doors configuration and instant cost price updates accordingly to any changes U make to the window, like glass types, colors, openers and plenty more. And since my last order the range of products U can configure online has changed :) Now also you can design your bi folding and sliding patio doors online in seconds !!!!! Will be ordering soon !!! I love hassle free service PLUS delivery is always on time. Some photos from my little project for my next door neighbor from few months back. Totally pleased with final result :) Both of Us.