Apologies for delay in reponding....my broadband died a death this weekend!
The gap between the door head and u/s arch is 300mm. Have been thinking about 'options' over the weekend, and then reading your posts...think that doors + fanlight panel would work well in the space.
Therefore...
Am looking to remove a sash window and replace it with french doors, on a flank supporting double brick wall. The doors will be custom made to fit into the existing opening ( i.e the width or height will not be altered), and the only alternation will be removing 4 courses of brick below the...