DuPage County, IL Fire Regulations: Smoke Detectors (2026)
Key Facts
- Governing section
- Sec. 8-211(A)
- Required locations
- Each bedroom, sleeping-area hallway, furnace room, every story
- Retrofit trigger
- Any permitted addition, repair or new sleeping room
- Detectors must be
- Interconnected, audible in all sleeping areas
- Power source
- 110-volt wired with battery back-up, Sec. 8-211(C)
- Violation fine
- $100-$1,000 per day, Sec. 8-117.4
Summary
DuPage County's Building Code requires smoke detectors in every bedroom, outside sleeping areas, in furnace rooms and on every additional story, including basements, under Sec. 8-211(A). A permitted addition or new sleeping room triggers a whole-building retrofit to current placement standards, and all detectors must be interconnected and audible in every sleeping area.
8-211: - AUTOMATIC FIRE AND CARBON MONOXIDE DETECTION. A.Smoke Detectors Required: Smoke detectors shall be installed in each bedroom, outside of each separate sleeping area in the immediate vicinity of the bedrooms, in all furnace rooms and on each additional story of the dwelling, including basements and cellars but not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split-levels, a smoke detector need be installed only on the upper level, provided the lower level is less than one full story below the upper level, except that if there is a door between levels, then a detector is required on each level. All detectors shall be connected to a sounding device or other detectors to provide, when actuated, an alarm which will be audible in all sleeping areas. All detectors shall be approved and listed and shall be installed in accordance with the manufacturer's instructions. When additions, repairs or substantial alterations requiring a permit occur, or when one or more sleeping rooms are added or created in existing dwellings, the entire building shall be provided with smoke detectors located as required for new dwellings.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 14 Update 1).
Full Breakdown
Sec. ' For split-level dwellings, one detector on the upper level suffices only if the lower level is less than one full story below it, unless a door separates the levels, in which case each level needs its own detector. ' The retrofit trigger is broad: when 'additions, repairs or substantial alterations requiring a permit occur, or when one or more sleeping rooms are added or created in existing dwellings, the entire building shall be provided with smoke detectors located as required for new dwellings,' so a kitchen remodel permit can obligate a homeowner to bring the whole house's smoke-detector coverage up to current standard, not just the remodeled room.
Subsection C ties smoke detectors to the same power standard as carbon monoxide detectors: 110-volt wiring with battery back-up. Subsection D layers on a separate fire-sprinkler compliance step, requiring a letter from the local fire department or fire district before the county issues a new residential home or addition permit.
Violations & Fines
Missing or misplaced smoke detectors are enforced as Building Code violations under Sec. 8-117.4, which sets a fine of 'not less than one hundred dollars ($100.00) nor more than one thousand dollars ($1,000.00),' with each day of noncompliance a separate offense. Under Sec. 8-117.2, the Building Official must first issue a written notice of violation and give the owner fourteen days to correct the coverage or request an administrative appeal before legal action follows.
Frequently Asked Questions
Where does DuPage County require smoke detectors?
Does a small permitted remodel force a whole-house upgrade?
Do the detectors need to be interconnected?
What's the penalty for missing smoke detectors?
Sources & Official References
Other rules in DuPage County
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