Skokie, IL Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- New 1-2 family/townhouse construction
- sprinklers required throughout
- Addition threshold
- 50% or more of original floor area
- Alteration threshold
- 80% or more of existing floor area
- Design standard
- NFPA 13D or IRC Section P2904
- Excluded area
- floors more than 50% below grade
Summary
Skokie requires an automatic fire sprinkler system throughout new one-family, two-family and townhouse construction, and in most additions or alterations that substantially rebuild an existing home, under the Village's amended Section R313 of the residential code.
(26)R313 Automatic Fire Sprinkler Systems. Delete R313.1, R313.1.1, R313.2, R313.21 and replace with: R313.1 Fire Sprinklers. An approved automatic fire sprinkler system shall be installed throughout an entire one-family, two-family or townhouse residence under the following circumstances: A.Any new construction of such residence;B.Building additions that increase the floor area of such residence by 50 percent or more of the original square footage of the building prior to construction.C.Building additions less than 50% of existing structure's square footage, plus alterations to the existing structure that equals 80% or more of the existing square footage.D.Alterations that affects 80% or more of the existing structure's square footage. *Any floor (from finished floor to ceiling) that is more than 50 percent below grade shall not be counted as floor area for purposes of the section only. Attached garages are counted towards the original square footage. R313.2 Design and Installation. Automatic sprinkler systems shall be designed and installed in accordance with Section P2904 or NFPA 13D.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 205 | Zoning: Supplement 89).
Full Breakdown
21 of the adopted 2021 International Residential Code with the Village's own sprinkler rule. An approved automatic fire sprinkler system must be installed throughout an entire one-family, two-family or townhouse residence in four circumstances: any new construction of such a residence; a building addition that increases the floor area by 50 percent or more of the original square footage; an addition of less than 50 percent combined with alterations equal to 80 percent or more of the existing square footage; or alterations alone that affect 80 percent or more of the existing structure's square footage.
In calculating those percentages, any floor area more than half below grade is excluded, but attached garages count toward the original square footage. 2 requires it be designed and installed to NFPA 13D or to Section P2904 of the plumbing code, the two recognized residential sprinkler design standards. 3 before a certificate of compliance issues.
Violations & Fines
Building or substantially altering a one-family, two-family or townhouse residence without the required NFPA 13D or Section P2904 sprinkler system, where the 50-percent addition or 80-percent alteration threshold is met, violates the amended Section R313 and blocks issuance of a certificate of compliance under Section 111.3; violations are otherwise enforced under the Chapter 1, Section 1-6 general penalty.
Frequently Asked Questions
Does a new single-family house in Skokie need fire sprinklers?
Will remodeling my house trigger the sprinkler requirement?
What sprinkler design standard does Skokie require?
Sources & Official References
Other rules in Skokie
Compare Skokie to another location·View the Illinois building safety overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Fire Sprinkler Requirements in Nearby Cities
How other cities in Cook County handle fire sprinkler requirements.