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Do I Need Planning Permission to Install Secondary Glazing? It is possible to install secondary glazing inside the current frame in order to reduce energy bills and muffle outside noise. It's perfect for period properties and listed buildings where windows aren't feasible. It's an excellent solution for damp buildings too However, it is best to use it after other issues have been resolved to stop draughts from depriving the building of vital airflow. Do I require planning permission? Change of windo