The shared stair
In a tenement, the common stair is how materials and people move. A window replacement has to respect neighbours, drying days and the narrow turn of the stair itself. The survey notes access as carefully as it notes the glass.
Sandstone and sash openings
Blonde and honey sandstone fronts hold deep reveals. On a New Town crescent the openings follow the curve; proportions matter to the street as much as to the room. None of that is settled by a generic product photo — it is settled on site.
Later houses
Liberton, Colinton, Corstorphine and many streets in Leith show later plans: different wall builds, different cills, sometimes wider rooms. The same company visit still starts with the opening you have.
What we do not invent
Listed-building and conservation-area rules are not guessed on a blog. The surveyor and the council confirm what a particular building needs. Until that conversation happens, treat any online claim as incomplete.
For the wider offer see double glazing in Edinburgh. For frame choices that often come up on these visits, readedinburgh upvc windows.