- The exam is 50 four-option multiple-choice questions in two hours, delivered by PRONTO remote proctoring, priced at US$320 on ICC's product page.
- Exam 79 is listed in both 2021 and 2024 code editions; buy study materials that match the edition you purchased.
- You need a scaled score of 75, which is not necessarily 75% raw accuracy.
- The exam is open book, so tabbing and navigating your code book matters more than memorizing tables.
What ICC Exam 79 Actually Is
Before building a study plan, be precise about what you are studying for. Here, REI-PE means the Residential Energy Inspector/Plans Examiner examination from the International Code Council (ICC), which maps to ICC examination 79. "REI-PE" is the label used on this site for that exam; it is not ICC's official exam code, and the acronym is shared by unrelated credentials from other organizations. If a resource mentions a different certifying body, different fees, or different domains, it is not about this exam.
The credential tests whether you can verify residential energy code compliance, both on paper (plan review) and in the field (inspection). That dual role shapes everything about how the exam reads: questions tend to present a scenario, such as an assembly, a duct system, a window schedule, or an addition to an existing home, and ask what the code requires or permits. If you are still orienting yourself, our explainers on what REI-PE is and the REI-PE certification cover the basics, and the REI-PE requirements guide covers eligibility.
Format, Fees, and Booking Mechanics
The logistics are simple, but several details trip up first-time candidates. Here is what ICC's published material confirms:
| Item | What the Issuer Material Shows |
|---|---|
| Questions | 50, four-option, single-answer multiple choice |
| Time limit | Two hours |
| Delivery | PRONTO remote proctoring |
| Displayed price | US$320 on the ICC product page |
| Use window | Purchase must be used within 365 days |
| Refunds and transfers | Non-refundable and non-transferable |
| Reference policy | Open book; check ICC's published restrictions for your edition |
Two cautions. First, the product page displays $320 but the separate member and non-member price fields could not be verified, so do not assume a member discount until you see it at checkout. Second, because the purchase is non-refundable and non-transferable, treat the 365-day window as a hard deadline and book your session only when your practice results are stable. Our REI-PE certification cost breakdown and exam dates and scheduling guide go deeper on budgeting and timing.
The First Decision: 2021 or 2024 Edition
ICC's current national exam list (updated January 12, 2026) shows exam 79 offered under both the 2021 and 2024 code editions. That makes edition selection the single most consequential early choice. Your code book, tabs, highlights, and practice questions all need to match the edition you purchased. Studying from the 2024 IECC while sitting for a 2021-based exam (or the reverse) is a classic, avoidable error, because provisions, numbering, and appendices differ between editions.
- Confirm the edition on your purchase before buying any code book or course.
- Check ICC's approved reference list for that specific edition.
- Discard or quarantine study notes written for the other edition.
- When a practice question cites a section number, verify it exists in your edition rather than assuming.
Key Takeaway
Write the edition on the cover of your code book and at the top of every notes page. When a question feels unfamiliar, your first check should be whether your materials and the question's edition actually match.
The Six Preparation Topics, Explained
ICC's 2026 preparation course for exam 79 under the 2024 IECC publishes six topic areas. These are curriculum topics, not formally weighted exam domains, and ICC's formal edition-specific blueprint with percentage weights could not be verified. Treat them as a reliable map of what to learn, not as a promise of how many questions each will produce. For a deeper look, see our complete guide to all six REI-PE content areas.
Domain 1: History and future of energy codes
This is context, and it supports the rest of the exam. Understanding why the IECC evolves, and how successive editions tighten requirements, helps you reason about unfamiliar provisions.
- Know that provisions change between editions and why that matters for your reference book.
- Be able to place the code in the broader regulatory and adoption picture.
Domain 2: Administration and documentation requirements
The plans examiner half of the job lives here. Expect questions about what must appear on construction documents and what an inspector or examiner can require.
- Required information on plans and specifications.
- Inspection and documentation responsibilities.
- Where administrative provisions sit in the code book so you can find them fast.
Domain 3: Compliance options
The IECC offers more than one path to compliance, and exam scenarios often hinge on recognizing which path a project is using.
- Distinguish prescriptive, performance-based, and other compliance routes.
- Know which requirements are mandatory regardless of path.
- Recognize when a tradeoff is allowed and when it is not.
Domain 4: Specific thermal envelope and systems provisions
This is the technical core of residential energy inspection, and historically the heaviest part of ICC's earlier outlines (see the note on weights below). Expect scenario-driven questions on assemblies and systems.
- Insulation, fenestration, and air leakage requirements.
- Duct and mechanical system provisions.
- Lighting, service water heating, and related systems.
- Reading tables correctly, including climate-zone lookups.
Domain 5: How the IECC relates to existing buildings
Additions, alterations, repairs, and change of use or occupancy follow their own logic. Candidates often underestimate this area because new construction dominates daily practice.
- When a project triggers energy code compliance and to what extent.
- Exceptions and relief provisions for existing construction.
Domain 6: Expanded appendices of the 2024 IECC
Appendices extend the code with optional and supplemental material. Because this topic is tied to the 2024 IECC, it matters most if you purchased the 2024 edition.
- Learn what each appendix covers and whether it is mandatory or adoptable.
- Practice locating appendix content in your book quickly.
Winning an Open-Book Exam
Open book changes what "knowing the material" means. You are not rewarded for memorizing every R-value; you are rewarded for navigating the code quickly and reading it accurately. Many candidates who fail do so because they spent too long hunting for a section, or because they read a table row against the wrong climate zone.
Build a navigation system, not a memory palace
- Tab major chapters and the tables you will use repeatedly, within whatever limits ICC's published reference rules allow. Check those rules before you mark up a book.
- Learn the code's structure: where scope and administration sit, where each compliance path lives, where definitions are.
- Practice finding answers by section number and by keyword, since question stems rarely tell you where to look.
Read the stem like an inspector
Scenario questions often hide the deciding fact in a single phrase: new construction versus alteration, which compliance path, which climate zone, whether a component is part of the thermal envelope. Underline that phrase mentally before you open the book. Then confirm your answer against the code text instead of trusting recall.
Key Takeaway
With 50 questions in 120 minutes you have a little over two minutes per question on average. Practice with a timer and a physical book so that looking something up becomes a rhythm, not an interruption.
A Domain-Sequenced Study Schedule
Rather than generic advice, sequence your weeks around how the topics depend on each other. Administration and compliance paths come first because every technical question assumes you know which path applies. Envelope and systems come next, when you have context. Existing buildings and appendices come last because they layer exceptions on top of base rules. Adjust the length to your starting point; this is a six-week example.
Orientation and Administration
- Confirm your edition and set up the correct code book.
- Study history and future of energy codes, then administration and documentation requirements.
- Take a short diagnostic to find your weak spots.
Compliance Options
- Map the compliance paths and what each requires.
- Identify mandatory provisions that apply to every path.
Thermal Envelope and Systems
- Work through insulation, fenestration, air leakage, ducts, and mechanical and lighting provisions.
- Drill climate-zone table lookups until they are automatic.
Existing Buildings and Appendices
- Study additions, alterations, repairs, and change of use or occupancy.
- Survey the expanded appendices and their applicability.
Timed Simulation and Review
- Complete full 50-question, two-hour practice runs.
- Review every miss by section, not by score.
If you want focused practice by topic, the REI-PE practice test site lets you drill questions and track which areas need another pass. For a compact review sheet near the end, see the REI-PE cheat sheet.
Scaled Scoring and Pass Expectations
ICC's passing-score policy requires a scaled score of 75. A scaled score is not the same as getting 75% of questions right, because scaling adjusts for differences between exam forms. In practice, do not aim to "just clear 75%." Aim for consistent, comfortable margins on timed practice so form-to-form variation does not decide your result. Our passing score guide explains the policy in more detail.
Be cautious with pass-rate claims. ICC's marketing language about up to 90% of course participants passing is a statement about a course population, not a published pass rate for all test takers. For what the available data does and does not show, read our pass rate analysis, and for a realistic sense of difficulty, see how hard the REI-PE exam is.
After You Pass: Renewal and Career Use
ICC's 2026 renewal bulletin describes a three-year renewal cycle for one certification, requiring 1.5 CEUs, including at least 0.8 qualifying Part 1 CEUs, with a renewal fee of $105 for members and $130 for non-members. Renewal fees are separate from exam fees, so budget for them over the life of the credential. Note that the bulletin's publication date appears inconsistently between its parsed text and rendered cover, although the fee and CEU tables agree; confirm current terms directly with ICC when your renewal approaches.
This credential is most relevant to people who review residential plans or inspect residential construction for energy code compliance, including code officials, third-party inspectors, and energy raters working alongside HERS programs. HERS Rater status belongs to a separate combined IECC/HERS designation and is not established as a prerequisite for standalone exam 79, and no exam-specific education or experience minimum was verified in the accessible issuer material. No exam-specific salary data or earnings premium was verified, so treat any specific pay claim with skepticism; our salary guide, ROI analysis, and jobs overview discuss what can and cannot be said responsibly.
Frequently Asked Questions
The exam has 50 four-option, single-answer multiple-choice questions with a two-hour time limit, delivered through PRONTO remote proctoring.
Yes. ICC publishes reference restrictions, and an approved reference list exists for each edition, so check both before you tab or annotate your books.
Exam 79 is listed under both the 2021 and 2024 editions. Study the edition that matches your purchase, and make sure your code book and practice materials match it.
No. The passing standard is a scaled score of 75, which is not necessarily 75% raw accuracy. Aim well above the minimum on timed practice.
No. Exam purchases are non-refundable and non-transferable and must be used within 365 days, so schedule only once your practice scores are consistently strong.
Start by confirming your edition, then work through the six topics in dependency order, and finish with timed, open-book simulations. For more depth, revisit the REI-PE study guide hub and the practice test site as you move toward exam day.