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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 lower energy costs. It's perfect for period properties and listed buildings where new windows are not an option. It's an excellent solution for damp buildings However, it is best to use it after other issues are fixed to stop draughts from depriving the building of airflow essential to its construction. Do I Need Planning Permission? The replacement of window