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Do I Need Planning Permission to Install Secondary Glazing? It is possible to add secondary glazing inside the existing frame to cut down on energy bills and muffle outside noise. It's perfect for old homes and listed buildings where windows aren't feasible. 's a great solution for damp buildings However, it should only be used after other issues have been addressed to avoid draughts denying the building of airflow essential to its construction. Do I need a Planning Permission? The replacement of window