What matters for project planning
Roofing sits largely outside the city's stormwater permitting, with one practical connection worth understanding. A roof is the surface generating the runoff that on-site stormwater control facilities are required to handle, so a replacement that changes roof area, pitch or drainage points changes what arrives at those facilities. Where a parcel falls inside the DuPage County floodplain regulations Naperville has adopted, extensive repair relative to the structure's value can engage further requirements. Work carried out at roof level sits outside the land-disturbing rules entirely.
Where these details come from
One parcel isn't the whole county
Countywide ordinance summaries don't establish one parcel's floodplain status or soil conditions — confirm those directly with DuPage County and your chosen provider.
Reviewed July 26, 2026. Ordinances and floodplain maps change, so confirm anything time-sensitive.