Iowa state building code plan review: the 2024 IBC, IRC, and IEBC since September 10, 2025, the 2012 IECC statewide, and Building Code Bureau review

Which Iowa codes apply to a set of drawings?

Under Iowa Code chapter 103A, the state building code commissioner, with the approval of the Building Code Advisory Council, adopts the state building code by rule, and 481 IAC 300.1 names Chapters 300, 301, 321, 322, and 323 as that code. Section 103A.10 applies it to every building owned by the state or a state agency, in each city or county that accepts it by ordinance, to newly constructed buildings paid for in part with state appropriations but not wholly state-owned (subject to the local-code rule in section 103A.10A), and in each city of more than 15,000 people that has not adopted a local building code substantially in accord with a nationally recognized code. The same section applies the energy conservation provisions to all construction in the state with enclosed space that is heated or cooled, and 481 IAC 301 Part 2 applies the accessibility rules statewide to new buildings and facilities available to the public, other than places of worship, which may follow either the 2010 ADA Standards or IBC Chapter 11, and to multifamily buildings. Plumbing and mechanical work follow the state plumbing code (481 IAC 425) and state mechanical code (481 IAC 426) adopted by the Plumbing and Mechanical Systems Board, which say local jurisdictions may not adopt other plumbing or mechanical codes, and electrical installations follow the state electrical code in 481 IAC 404. Under section 103A.22 a city or county may adopt its own building regulations, but where it has accepted the state code it may not make the code more restrictive, with an exception for the energy conservation requirements. Where a city enforces its own building code instead of the state code, confirm the edition it adopted.

Rule 481—301.3 adopts the 2024 IBC, 481—301.8 the 2024 IRC for detached one- and two-family dwellings and townhouses not more than three stories with a separate means of egress, 481—301.7 the 2024 IEBC, and 481—301.42 the 2024 IEBC again as the state historic building code, an alternative for historic buildings. All were adopted under ARC 9474C, effective September 10, 2025, and renumbered from the Department of Public Safety’s chapter 661 to DIAL’s chapter 481 in November 2025. Rule 481—301.10 lets a project that obtained preliminary approval within 12 months after revised standards take effect follow either the new or the previous standards. Rules 481—301.24 and 301.25 adopt the 2012 IECC, the residential provisions for residential buildings of three or fewer stories and the commercial provisions for commercial buildings and residential buildings of four or more stories, and DIAL’s plan review page lists the same edition. The state plumbing code adopts the 2024 UPC (481—425.1, effective March 26, 2025), the state mechanical code the 2024 IMC (481—426.2, effective March 26, 2025), and the state electrical code the 2023 NEC (481—404.3, effective July 1, 2025). The fire control rules in 481 IAC 280 adopt the 2024 IFC and, since June 3, 2026, IBC Chapters 2 through 7 and Sections 804 and 805 as general fire safety requirements, and 481—280.14 applies the 2012 NFPA 101 to hospitals, nursing facilities, hospices, intermediate care facilities, ambulatory surgical centers, and religious nonmedical health care institutions. All checked November 3, 2026.

The Iowa amendments change what a reviewer looks for. The IBC rule keeps only Appendix C, replaces Section 423 so that any storm shelter or weather safe room follows ICC 500-2014, and Part 6 applies that standard’s tornado provisions to every weather safe room, whether a statute requires it or the owner adds it voluntarily. The rule replaces Section 903.2.8 with Iowa’s own Group R sprinkler text and a cabin building exception, rewrites the Group E fire alarm section, asks for a rational smoke analysis for windowed buildings under Section 408, adds frost protection at exterior door landings and paved exit discharge pathways to the public way, sends bleachers and folding and telescopic seating to ICC 300-2012 with Iowa inspection amendments, deletes IBC Chapter 29 in favor of the state plumbing code, and replaces references to the IPC, IMC, IFGC, IRC, and IECC with the Iowa rules. The IRC rule deletes the townhouse and dwelling sprinkler sections, rewrites the emergency escape and rescue opening section, replaces Chapter 11 with the Iowa residential energy rule, and replaces the IRC fuel gas, plumbing, and electrical chapters with the state rules, keeping Section P2904.

Energy review has its own paperwork. Under 481—301.23, plans for a building with more than 100,000 cubic feet of heated or cooled space are reviewed for energy compliance by a registered architect or licensed engineer, who files a signed and sealed statement with the commissioner or the local building official before construction or local permits, and under 481—300.6 every building permit application, other than remodels of one- and two-unit residential buildings, includes a statement that the work will meet the energy requirements. Rule 481—300.4 also calls for a life cycle cost analysis under Iowa Code chapter 470 for new public projects and additions over 20,000 square feet and for renovations exceeding half the building’s value.

Review depends on the building type and the location. DIAL’s Building Code Plan Review page says construction documents for adult day services, assisted living facilities, residential care facilities, elder group homes, facilities owned by the state or a state agency, new buildings with state funding, and licensed health care facilities must go to the Building Code Bureau regardless of any local code enforcement, and that K–12 schools, college and university buildings, child care facilities serving seven or more children, correctional facilities, and gaming facilities go to the bureau unless they were submitted to a local building department the department approves. The same page lists the cities and counties with their own building and fire code enforcement. Rule 481—300.4 and Iowa Code section 103A.10A read more narrowly for buildings that receive state funds but are not wholly state-owned: those go to the commissioner when the local government has not adopted building, electrical, mechanical, and plumbing codes or does not enforce them through plan reviews and inspections. Confirm with the bureau which path applies to a state-funded project in a city that enforces its own codes. Where a city adopts the state building code by ordinance and has a building department, rule 481—300.4 sends the submission to the city. The bureau holds a preliminary meeting early in design development, approves bidding only after the items on its preliminary meeting checklist are resolved, and wants a written response to its plan review comments before construction documents are issued for bidding. Its submission instructions ask for a project code sheet for preliminary review and accept only wet-signed and sealed “100% construction sets,” not preliminary or “not for construction” plans, for paper and digital submittals. Fire alarm and sprinkler shop drawings are submitted separately under 481—280.3, signed by a licensed responsible managing employee and approved first by the project architect or engineer. Permit routing is on the Iowa page, and the model codes have their own guides: IBC, IRC, IEBC, IECC, and UPC.

Gather the code sheet, the review path, and each discipline’s Iowa references

Collect the cover sheet and the code sheet DIAL asks for at preliminary review: the codes and editions cited, occupancy, construction type, heights and areas, occupant loads, and the fire protection systems. Add the site plan with exit discharge pathways to the public way, the life safety and egress plans, accessibility sheets that state the path chosen under 481—301.18, elevations, sections, and structural general notes, the mechanical, plumbing, fuel gas, and electrical drawings, the fire alarm and sprinkler drawings or the shop drawing schedule, any storm shelter or safe room drawings with the ICC 500 design basis, the energy documentation and the signed energy compliance statement, and the specifications.

Add the owner and funding source (state-owned, state-funded, or private), the facility type and any license it holds or seeks (health care, assisted living, elder group home, adult day services, school, child care, correctional, or gaming), the city or county and whether it enforces its own code or has adopted the state code, the heated and cooled volume, the preliminary approval date if the project relies on the transition rule, whether the building is historic, and, for a public agency, the life cycle cost analysis. Download 481 IAC Chapters 300, 301, 280, 404, 425, and 426 from the Iowa Legislature’s site.

Trace the Iowa rules through the set

Safe room documents continue in the ICC 500 guide, health care life safety in the NFPA 101 guide, sprinkler and alarm sheets in the NFPA 13 and NFPA 72 guides, bleachers in the ICC 300 guide, accessible routes in the ADA Standards guide and the Fair Housing Act guide, mechanical work in the IMC guide, plumbing in the plumbing drawing checklist, and the full set in the architectural drawing checklist. Neighboring state codes are in the Minnesota guide and the Wisconsin guide.

Example: an assisted living addition sent only to the city

Hypothetical example. A privately owned assisted living community in an Iowa city with its own building department plans a one-story addition with a dining room, twelve apartments, and a weather safe room, and the addition’s heated and cooled volume is well over 100,000 cubic feet. The code sheet cites the 2024 IBC as adopted by the city and the 2021 IECC and names the city as the only reviewing authority, and the plans going out for pricing are stamped “Not for construction.” The safe room sheet cites FEMA P-361 as its design basis, the fire alarm sheet says shop drawings will go to the city fire department, and the set has no energy compliance statement.

DIAL’s Building Code Plan Review page lists assisted living facilities among the projects that go to the Building Code Bureau regardless of local code enforcement, and the bureau accepts only wet-signed and sealed 100% construction sets, while the cover sheet names only the city and the set is marked “Not for construction.” The safe room cites FEMA P-361, while 481—301.39 requires weather safe rooms to follow ICC 500-2014. The energy notes cite the 2021 IECC, while 481—301.24 and 301.25 adopt the 2012 IECC, and 481—301.23 calls for a signed and sealed energy compliance statement before construction for a building of this volume. Fire alarm shop drawings are routed only to the city, while DIAL says local fire code enforcement does not replace bureau review for these facility types and 481—280.3 has the shop drawings submitted to the department after the responsible engineer approves them. Confirm the reviewing authorities, the energy basis, and the safe room standard.

The architect confirms with the Building Code Bureau that it reviews the addition, schedules the preliminary meeting, revises the safe room to ICC 500-2014, confirms the energy code with the bureau and the city, prepares the energy compliance statement, and routes the fire alarm shop drawings through the engineer to the bureau. The finding is a coordination conflict; the Building Code Bureau and the city decide compliance.

Review an Iowa set with Groundbook

Upload the current drawings and specifications to Groundbook, and state the edition, amendments, and review scope in your instructions. The Iowa Legislature publishes 481 IAC Chapters 300, 301, 280, 404, 425, and 426 and Iowa Code chapter 103A as free PDFs, and DIAL publishes its plan review requirements and local enforcement lists. Upload the Iowa rules your project relies on as code files, with the 2024 International Codes, the 2012 IECC, the 2024 Uniform Plumbing Code, the 2023 NEC, and ICC 500-2014 from copies you are licensed to use where the license permits uploading them. See how Groundbook works with local and licensed codes.

Compare the cover sheet, code sheet, and every discipline’s general notes with the architectural, life safety, accessibility, structural, mechanical, plumbing, fuel gas, electrical, fire protection, safe room, and energy documents. Flag citations to IBC, IRC, or IEBC editions other than 2024 unless my instructions say the project has preliminary approval under the transition rule, energy notes not on the 2012 IECC as amended in the supplied 481 IAC 301, references to the IPC, the IFGC, or IBC Chapter 29, safe rooms not designed to ICC 500-2014, Group R sprinkler and Group E fire alarm notes that do not match the supplied Iowa amendments, a missing energy compliance statement, and a reviewing authority that does not fit the building type in my instructions. Use the supplied Iowa rules and model codes and cite both sources.

Groundbook compares the set with reference documents you upload, including licensed codes and standards you hold, and links each potential finding to the sheet and to the Iowa rule or model code. It has no built-in licensed code library and does not certify compliance, perform calculations, or produce design. Each finding is a question for the responsible professional, and Groundbook does not decide which authority reviews the plans, whether the transition rule applies, or whether a city’s own code governs.

Document review does not issue a permit or plan approval, or replace the design professional, the local building official, the Building Code Bureau, or the fire code authority.