Little regulatory reach, mostly physical constraints
Window replacement sits largely outside floodplain and stormwater administration, with the usual exception for work extensive enough to engage improvement thresholds inside a mapped zone. What actually governs the outcome is physical: whether original sash is worth repairing, whether openings are standard sizes, and how the installation is flashed on elevations that take wind-driven rain.
Official sources
Confirm the parcel, then confirm the openings
Citywide records cannot tell you your parcel's flood status, whether your openings are standard, or the condition of the framing behind them. Check the first with LFUCG if the project is substantial, and the rest with whoever measures for the order.
Reviewed as of 2026-07-20 -- keep in mind that official maps and requirements do get updated periodically.