Document the condition
Note location, timing, weather relationship, changes over time, and any previous work. Photos and simple measurements can improve the first conversation.
Read the local context
Joliet's East Side Historic District carries 290 buildings, 281 of them contributing to its National Register listing, with 32 houses built between 1852 and 1873 favored near the old rail depot; Lockport's core dates to its 1837 canal-headquarters platting and 1853 incorporation, while Crest Hill and New Lenox carry a different housing-age story, built out mostly in postwar subdivision waves after their 1960 and 1946 incorporations. That range of construction eras -- pre-1873 framing, mid-century crawlspaces, and later slab-on-grade additions -- means humidity and moisture behave differently house to house, and a mold plan has to start with the age and envelope of the specific building, not a metro-wide assumption.
Ask what will be hidden
Visible growth is only part of the problem. A durable plan addresses water entry, humidity, material condition, containment, and post-work verification. The written scope should explain the preparation and verification that will no longer be visible at completion.
Compare complete scopes
Look for protection, access, materials, permits, testing, cleanup, restoration, exclusions, warranties, and change-order rules.
What official local sources add
The City of Joliet enacted a Stormwater Management Ordinance and is the permitting authority for land-disturbing and exterior work within city limits; the Community Development Department (150 W. Jefferson St., Joliet, IL 60432, (815) 724-4040) handles permits, and parts of Joliet sit within a mapped 100-year flood zone near the Des Plaines River. Will County separately maintains stormwater and water-resource ordinance chapters for unincorporated parts of the county. Confirm current exterior-work and permit requirements with the relevant authority before starting envelope or moisture-correction work.
Sources reviewed 2026-07-26. Confirm parcel-specific flood zones, historic-district status, permits, and current requirements with the relevant authority before authorizing work.