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Do I Need Planning Permission to Install Secondary Glazing? Secondary glazing can be fitted within the existing frame to mute outside noise and cut down on the cost of energy. It's perfect for old homes and listed buildings where windows aren't feasible. It's a great option for damp buildings too However, it should only be used after other issues have been resolved to stop draughts from depriving the building of vital airflow. Do I require planning permission? Change of windows is a typical home impr