At Colin's Sash Windows we provide high quality uPVC sash windows which you can install yourself. We deliver our windows nationwide from only £249 all inclusive. The windows are extremely energy efficient whilst maintaining the beautiful historic sash window look that you desire.They have been given an A+1 rating and have a low u value of 1.5 as standard. We can improve that to 1.3 with an A+6 rating if required. Our UPVC sliding sash windows are available in a wide range of styles and hardware options. An extensive range of Georgian and astragal bars will satisfy the most custom requirements. Sash horns help replicate the original timber sashes and are fitted free as standard if you require.