We live in a ground floor flat, share of freehold converted from a large Victorian mansion style house. Not in a conservation area.
There is a single garden door off the living room leading to our garden at the side of the building. The door is old and wooden and needs to be replaced. Trying to work out if we need planning permission to replace it for one that has some form of glazing, but basically the same size.
It's not original to the building but been here when the building was converted to flats 25 years ago.. I know we need to have it for replacing the spiral balance sash windows (even though they're not original

Struggling to get an answer to this question anywhere and given there are so many houses from converted to flats thought someone may have done the same
Thanks in advance