In many houses, double glazing has been fitted to windows while wooden doors continue to let in cold draughts and let out warmth. Replacement of older, wooden doors can make a significant contribution to the heat retention of a home.

A popular change is the replacement of ground floor windows with Patio Doors or French Windows. Not only do these doors give immediate access to gardens and patio areas but the added light makes rooms brighter and has the effect of bringing the garden into the home.