The cost of back doors depends upon different factors – the type, size, material, or style of door you want to install. Some additional factors that may vary the cost are – additional glass features, replacement of side panels, and type of locking system. However, the average prices of our back doors are as follows: ● The cost of our uPVC back doors starts at £700 and average back door costing around £950. You may connect with us via phone or email to get honest upfront pricing!