We carefully remove the original coloured leaded glass from the existing wooden frames. They are then professionally cleaned and restored back to their former glory. They are encapsulated between two pieces of our A-rated high performance glass creating a brand new triple glazed unit. They are then reinstalled into our brand new pvc frames. Retaining all the beautiful charm of an old glass window in new thermally efficient frames. Another great advantage of doing this is that because the original glass is encapsulated & it will never get dirty again.