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
The City of Naperville is the local permitting authority for land-disturbing activity and requires property owners to maintain on-site stormwater control facilities; Naperville has adopted DuPage County's floodplain regulations for the portions of the city within DuPage County, and Naperville's own stormwater plan relies on storm sewers, detention basins, and overflow routes. DuPage County Stormwater Management enforces the countywide Stormwater & Floodplain Ordinance across five program areas -- Watershed Management, Floodplain Mapping, Water Quality, Regulatory Services, and Flood Operations -- and the county's building code requires soil testing in areas likely to have expansive clay soils.
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.