Pquire further trims/quadrants to be fitted during installation – antother process that may result in added expense you may wish to avoid.VC windows are normally the same depth or slightly larger than a home’s original windows, they are very easy for installers to retrofit into existing properties. By contrast, aluminium windows tend to be of a slimmer depth, meaning they can be hard to fit into gaps where the initial window would have been.

Due to this, more trimming and plastering work may be required when installing aluminium frames.which can result in a longer , more disruptive and costly installation .