When looking to make changes to your heritage windows, there is a difference between repair and replacement.

Repair is keeping your current windows intact and trying to retain as much original fabric of the window as possible.

Replacing windows is only eligible if like-for-like replacement is recommended (eg the same material, style, structure, etc). Replacement is only eligible if the windows are of an original style.

Please note that double glazing is possible for heritage windows without requiring full replacement or removal.