Peoria, IL Building Safety: Fire Sprinkler Requirements (2026)

The 2018 International Residential Code Section R313.2 nominally requires automatic sprinkler systems in new one- and two-family dwellings, but the Illinois Capital Development Board amended the state-adopted IRC to remove R313.2 for unincorporated areas, and Illinois municipalities may either adopt or omit the residential sprinkler mandate at their discretion. Peoria has adopted the 2018 IRC under Peoria Code Chapter 5, Article III but has not imposed a local mandate for sprinklers in new one- and two-family homes — Skokie and a few other Chicago-area villages have done so, but Peoria has not. For all other occupancies, Peoria's adoption of the 2018 IBC and 2018 IFC carries the standard ICC sprinkler thresholds: IBC Section 903.2 requires NFPA 13 sprinklers in most A, E, F, I, R, and S occupancies above certain area, height, or occupant-load thresholds (for example, R-2 multifamily buildings four stories or more in height, A-2 nightclubs over 5,000 sq ft or over 100 occupants, M occupancies over 12,000 sq ft, S-1 storage over 12,000 sq ft). New Group R-1 (hotels) and R-2 (apartments) with 3 or more units typically require NFPA 13R systems. Existing buildings undergoing substantial alteration, change of occupancy, or addition can trigger retroactive sprinklering under the 2018 International Existing Building Code (also adopted by Peoria). Sprinkler design must be performed by a licensed Illinois Fire Sprinkler Contractor (225 ILCS 317/) and the installation is permitted, plan-reviewed, and inspected by the Peoria Fire Department working with the Inspections Division.