Energy code compliance testing in Iowa
Independent third-party blower door and duct leakage testing that gets your new home through its energy inspection — with a signed report for your building official.
What Iowa’s energy code actually requires
Iowa adopted the 2012 International Energy Conservation Code, with state amendments, as a statewide energy standard effective in 2014. It applies to all new one- and two-family homes — even in jurisdictions without a formal building department. Note that this is separate from the building code: while Iowa moved to the 2024 IRC for construction, the energy standard remains the 2012 IECC. Here are the testing thresholds that matter at inspection.
Tighter than 5 ACH50 triggers ventilation. Because a home that passes at 4 ACH50 is below the 5 ACH50 threshold, the code expects whole-house mechanical ventilation. We flag this when we test so it isn’t a surprise at final inspection.
Documenting compliance with REScheck
Field tests prove the finished house is tight. REScheck proves the design meets code on paper. Iowa’s 2012 IECC lets you show envelope compliance two ways — the prescriptive path, meeting each R-value and U-factor in the code table, or the performance / UA trade-off path, where stronger windows or ceiling insulation can offset a weaker assembly somewhere else.
REScheck is the free U.S. Department of Energy software that most Iowa building departments accept for the trade-off path. It takes the insulation R-values, fenestration U-factors, and assembly areas from your plans, checks the whole-building envelope against the code reference for the climate zone, and produces a compliance certificate to submit at plan review.
We include REScheck as part of our field-testing service. It can be prepared before or after construction and is submitted to document envelope compliance, while the field tests below verify how the finished house actually performs once it’s complete.
Two tests, one clean compliance report
REScheck handles the envelope paperwork at plan review. These are the field tests that verify the finished house meets code.
Blower door test
We seal a calibrated fan into an exterior doorway, depressurize the house to 50 pascals, and measure total air leakage. That gives a real ACH50 number to compare against the 4 ACH50 limit — not an estimate. More on blower door testing →
Duct leakage test
Where ducts run outside conditioned space, we pressurize the duct system and measure leakage in CFM25 against the to-outside or total-leakage limit. If everything is inside the envelope, we confirm the exemption applies.
Signed report & panel label
You get a dated, signed test report formatted for the building official, plus the permanent energy code certificate affixed to your main electrical panel recording the measured air leakage result. If a result misses, we tell you where the leakage is so it can be fixed before retest.
The point of a compliance test is that it’s independent
A blower door test code compliance result carries weight precisely because the person measuring isn’t the person who built or sealed the house. Home Star Iowa doesn’t do construction, insulation, or air sealing — testing is all we do, so the number you hand your code official is unbiased. That same independence is why builders use us for new-construction ratings and why homeowners trust the result. Why an independent auditor →
From call to compliance
Call or text to schedule
Reach Rob at 319-244-8564 with your address, the stage of construction, and your inspection deadline. Testing happens after the building envelope and all its penetrations are complete.
On-site testing
We run the blower door, and the duct test where it applies, and read the results on the spot. You’ll know whether the house passes before we leave.
Report and panel label
You receive a signed report with measured values against the 2012 IECC thresholds, ready to submit, and we post the permanent energy code certificate on your main electrical panel recording the result. If a result falls short, we identify the leakage so it can be sealed and retested.
Iowa energy code compliance testing — FAQ
What does Iowa’s energy code require for a new home?
Is a blower door test required for code compliance in Iowa?
Who can perform IECC testing in Iowa?
When in construction should the test be scheduled?
What happens if the house doesn’t pass?
Do you also do duct leakage testing?
Do I need a REScheck report?
Need a home tested for the Iowa energy code?
Independent blower door and duct leakage testing with a signed report for your building official. Serving Cedar Rapids and Eastern Iowa.
This page summarizes Iowa’s residential energy code requirements for general information and is not a substitute for the code text or the determination of your local building official. Iowa’s residential energy standard remains the 2012 IECC with state amendments, now codified in Iowa’s consolidated state building code at 481—Chapter 301 (Part 3), administered by the Department of Inspections, Appeals and Licensing. Jurisdictions with populations over 15,000 may adopt a more stringent code — confirm the edition and testing requirements your authority enforces.
Iowa energy code compliance testing is how a new home proves it meets the state’s energy standard before final inspection. Home Star Iowa handles Iowa energy code compliance testing — independent blower door and duct leakage testing — with a signed report for your building official, serving Eastern Iowa.
Where the Iowa energy code compliance testing rules come from
The requirements for Iowa energy code compliance testing are set forth in the state building code, now consolidated in the Iowa Administrative Code at 481—Chapter 301 (the energy provisions are in Part 3), and are administered by the Department of Inspections, Appeals, and Licensing. That rule is what makes blower door testing mandatory for new homes statewide. You can read Iowa’s current state building code on the Iowa Legislature’s website.