All your window and door questions answered In this FAQ area
How can I be sure that new windows and doors can be left alone?
Most new windows and doors are made of UPVC, a material which is weather-resistant. You should experience no rotting, flaking or discolouration in either product and if you do your chosen installer should replace them as part of their extended guarantee. The only attention they should require is a good wipe down with a cloth now and again. SImon is here