Document the condition
Note where it's happening, when it started, whether weather plays a role, how it's progressed, and what's already been done — photos and basic measurements help from the first call.
Read the local context
Bathroom vintage in Naperville-area homes tracks the same construction waves as the rest of the housing stock -- older in-town homes near the historic district may carry original or early-updated plumbing runs, while the ranch and split-level subdivisions built through the postwar decades standardized around fixture layouts and tile work that are now decades past a typical remodel cycle. DuPage County's permitting process applies to plumbing, electrical, and structural changes alike, and a home's original construction era is often the first clue to what's actually behind the wall before a new layout gets drawn.
Ask what will be hidden
Everything that matters gets covered by tile: drain placement, the framing underneath, waterproofing at every transition, ventilation sized to the room, and the access needed to do the work correctly. The written scope should explain the preparation and verification that will no longer be visible at completion.
Compare complete scopes
Look for coverage of protection, access, materials, permits, testing, cleanup, restoration, exclusions, warranties, and how change orders are priced.
What official local sources add
Honestly, very little of the city's stormwater and floodplain framework reaches an interior bathroom. Land-disturbing permits, on-site stormwater control facilities and the countywide ordinance enforced by DuPage County Stormwater Management all concern what happens outside the building envelope. The one exception is scale: where a parcel sits inside the mapped floodplain that Naperville has adopted DuPage County's regulations for, work extensive enough relative to the structure's value can engage additional requirements. Otherwise the permits that matter to you are the plumbing and electrical ones, and those are about the fixtures rather than the site.
Sources were reviewed 2026-07-26. Confirm parcel-specific flood zones, historic-district status, permits, and current requirements with the relevant authority before authorizing work.