Replacement sealed units: over time double glazed units can break down, causing condensation to build up between the glass and giving an unsightly misted appearance. Although these units cannot be repaired, they can be replaced.
Door and window repairs: doors and windows often need to be maintained to keep them in good working order, but often there are problems that simple maintenance cannot fix. Maybe the door does not shut properly or will not lock, or your window handle has broken? It is possible for all of these types of problems to be fixed.