2024 IBC, IRC, IEBC with Iowa amendments, 481 IAC ch. 301 (moved from 661 IAC ch. 300-301), effective Sept 10, 2025; energy provisions kept at the 2012 IECC (residential and commercial), residential air-leakage amendment effective Aug 12, 2026 (ARC 0412D). Enforced by State building code commissioner within DIAL adopts the code (Iowa Code ch. 103A); local governmental subdivisions issue permits and inspect. Mandatory only for state-owned buildings and cities over 15,000 lacking an equivalent local code. Checked on the primary source; the state record was last reviewed 2026-11-12.
Rule 301.3 adopts the 2024 IBC, 301.7 the 2024 IEBC and 301.8 the 2024 IRC, each amended. Energy rules keep the 2012 IECC; ARC 0412D (effective Aug 12, 2026) sets 4 air changes per hour in the simulated-performance reference design for Iowa's climate zones, matching the blower-door test. Plumbing and mechanical codes are separate.
Source: primary document
Statewide layer. County and city amendments sit on top; confirm the local office for the address.
In force; IAC Supplement 9/30/26 text re-read Oct 21, 2026, no edition change. Separately, ARC 0616D (Notice of Intended Action) would revise ch. 300 plan review fees, adding fire suppression and fire alarm tiers, and inspection fees; comments closed Oct 20, 2026; not yet adopted
These apply when the building has the equipment or fits the type named. The frequency is the standard one; your local official can set a stricter one, so confirm it for the address.
2024 IBC, IRC, IEBC with Iowa amendments, 481 IAC ch. 301 (moved from 661 IAC ch. 300-301), effective Sept 10, 2025; energy provisions kept at the 2012 IECC (residential and commercial), residential air-leakage amendment effective Aug 12, 2026 (ARC 0412D). Rule 301.3 adopts the 2024 IBC, 301.7 the 2024 IEBC and 301.8 the 2024 IRC, each amended. Energy rules keep the 2012 IECC; ARC 0412D (effective Aug 12, 2026) sets 4 air changes per hour in the simulated-performance reference design for Iowa's climate zones, matching the blower-door test. Plumbing and mechanical codes are separate.
State building code commissioner within DIAL adopts the code (Iowa Code ch. 103A); local governmental subdivisions issue permits and inspect. Mandatory only for state-owned buildings and cities over 15,000 lacking an equivalent local code.
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
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