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Do I Need Planning Permission to Install Secondary Glazing? It is possible to install secondary glazing inside the current frame to help reduce the cost of energy and reduce outside noise. This is ideal for period houses and listed buildings where replacing windows isn't an option. It's a great solution for damp buildings too however it is best to use it after other issues have been resolved to prevent draughts depriving the building of airflow essential to its construction. Do I need planning permiss