I have been asked my my director to find out how other cities define "one to one replacement". This has become (unfortunately) a hot topic this last year. On a window replacement, if you ask the building department they will say "same window size and openings". If you ask the community development department they will say "same window size, openings and material". This has become a huge issue concerning the replacement of windows, siding and roofs on buildings over 50 years old, multi-family units and buildings of historical significants. So, do any of your cities define "one to one replacement"?