Building Safety in St. Clair County, IL (2026)
7 rules for unincorporated St. Clair County, Illinois.
Verified from official government sources
Fire Sprinkler Requirements
St. Clair County does not mandate residential fire sprinklers. Building Regulations Sec. 7-2-72(C) instead requires builders of new one- and two-family homes to offer the buyer the option, at the buyer's cost, and document it in the permit application.
Fire Sprinkler Offer Rule, St. Clair County
Light RestrictionsSt. Clair County Building Regulations Sec. 7-2-72(C)
C. One and Two-Family Dwellings Automatic Fire Systems. A builder of one and two family dwellings to be constructed for a prospective purchaser shall offer to the purchaser at the time of entering into the construction/purchase contract the option, at the purchasers cost, to install or equip fire sprinklers in the dwelling, residence or unit. No purchaser of such one or two family dwelling shal...
Door Locking Hardware
Every rented dwelling, rooming or housekeeping unit in unincorporated St. Clair County must have a deadbolt lock on its entry door under Property Maintenance Code Section 29-3-35(A): openable without a key from inside, with a minimum one-inch throw, and a sliding bolt does not count. Operable windows within six feet of grade must carry a sash lock under Section 29-3-35(B), and secured basement hatchways are required under Section 29-3-35(C).
Deadbolt Lock Rules for Rentals in St. Clair County
Some RestrictionsSt. Clair County Property Maintenance Code Sec. 29-3-35(A) and (B)
29-3-35 Building security. Doors, windows or hatchways for dwelling units, room units or housekeeping units shall be provided with devised designed to provide security for the occupants and property within. (IPMC 304.18) A. Doors. Doors providing access to a dwelling unit, rooming unit or housekeeping unit that is rented, leased or let shall be equipped with a deadbolt lock designed to be readi...
Carbon Monoxide Detectors
Since January 1, 2007, every dwelling unit in unincorporated St. Clair County must have at least one approved carbon monoxide alarm within 15 feet of every room used for sleeping, per Building Regulations Sec. 7-2-71. Owners install; tenants maintain, test and replace batteries.
Carbon Monoxide Detectors Required, St. Clair County
Some RestrictionsSt. Clair County Building Regulations Sec. 7-2-71
7-2-71 Carbon monoxide detectors. Effective Date January 1, 2007 all dwelling shall be in compliance with the following: ... B. Carbon monoxide detector. 1. Every dwelling unit shall be equipped with at least one approved carbon monoxide alarm in an operating condition within 15 feet of every room used for sleeping purposes. ... C. Violation. 1. Willful failure to install or maintain in operati...
Building Permits
Any construction, addition, alteration, demolition or occupancy change to a building or structure in unincorporated St. Clair County needs a permit from the county building official before work begins, under Building Regulations Sec. 7-1-27. A short list of minor work, from small storage sheds to low fences, is exempt from the permit requirement under Sec. 7-1-28.
Building Permits in Unincorporated St. Clair County
Some RestrictionsSt. Clair County Building Regulations Sec. 7-1-27, 7-1-28
7-1-27 Required. Any owner or authorized agent who intends to construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system, the installation of which is regulated by this code, or to cause any such work to be done, shall first make...
Electrical Permits
Unincorporated St. Clair County requires a building permit before any electrical installation, alteration or repair, and enforces the National Electrical Code, 2011 edition, with county-specific amendments. The Building and Zoning Department's Electrical Inspector reviews wiring, service size and circuit protection before work begins. Skipping the permit or ignoring inspector orders is prosecuted as a petty offense.
Electrical Permit Rules in St. Clair County, IL
Some RestrictionsSt. Clair County Electrical Code Sec. 7-7-1
7-7-1 Adoption of Electrical Code. That a certain document, one (1) copy of which is on file in the office of the Zoning Administrator of St. Clair County, being marked and designated as "The National Electrical Code, 2011" as published by the National Fire Protection Association, Inc. be and is hereby adopted in part and as contained herein as the Electrical Code of St. Clair County, Illinois ...
Plumbing Permits
Unincorporated St. Clair County adopts the Illinois State Plumbing Code, 77 Ill. Adm. Code Part 890, as its own plumbing code under Building Regulations Sec. 7-12-1. Any new plumbing installation, alteration or replacement needs a permit from the Building and Zoning Department before work starts, and enforcement follows the state code's own terms under Sec. 7-12-3.
Plumbing Permit Rules in Unincorporated St. Clair County
Some RestrictionsSt. Clair County Building Regulations Sec. 7-12-1, 7-12-3
7-12-1 Adoption of Illinois Plumbing Code. The Illinois State Plumbing Code, 77 Illinois Administrative Code, Part 890, as amended and promulgated by the Illinois Department of Public Health, and as may be amended from time to time, is hereby adopted as the Plumbing Code of St. Clair County, Illinois by the St. Clair County Board, to govern the design and installation of new plumbing or plumbin...
Building Inspections
Work covered by a St. Clair County building permit must stay open for inspection at each stage under Building Regulations Sec. 7-1-58, and the building official runs through ten required checkpoints from footing and foundation to the final inspection, listed at Sec. 7-1-60(A) through (J), before the permitted work is considered complete.
Building Inspection Stages in St. Clair County
Some RestrictionsSt. Clair County Building Regulations Sec. 7-1-58, 7-1-60
7-1-58 General. Construction or work for which a permit is required shall be subject to inspection by the building official and such construction or work shall remain accessible and exposed for inspection purposes until approved. It shall be the duty of the permit applicant to cause the work to remain accessible and exposed for inspection purposes. 7-1-60 Required inspections. The building offi...
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