...seems like a daft question. But Regs designate a window to the outside a 'controlled fitting' so its kind of important. I have a floor to ceiling (almost) aperture which has a window in the top half and a cosmetic panel in the bottom half. The panel is hardwood. Is my 'window' just the top half or does the bottom half also amount to a 'window'. I definitely can't see through the bottom half! If its not a 'window' I guess it must be a 'wall'.
On reading Part 'L' (well some of it) such a design would no longer be permitted as the bottom half is more or less a heat sink. I'm a bit surprised it would have been permitted seven years ago when the building conversion was done. Anyway I plan to box out the interior and add insulation and window board to (vastly) improve insulation but in the absence of an external brick member even then the insulation will be less than desirable.
On reading Part 'L' (well some of it) such a design would no longer be permitted as the bottom half is more or less a heat sink. I'm a bit surprised it would have been permitted seven years ago when the building conversion was done. Anyway I plan to box out the interior and add insulation and window board to (vastly) improve insulation but in the absence of an external brick member even then the insulation will be less than desirable.