1.1 ICC P3 Exam Overview: Format, References & Content Weights
Key Takeaways
The ICC Plumbing Plans Examiner (P3) exam has 60 questions with a 2.5-hour time limit, per the ICC exam catalog.
The P3 exam is open book, and the 2024 edition references the 2024 IPC, the 2024 IFGC and ICC A117.1-2017.
ICC lets candidates bring copyrighted bound books to the P3 exam, but not study guides, presentations or practice questions.
Water Supply is the largest P3 domain at 19 percent, followed by Fixtures and Vents at 15 percent each.
ICC national certification exams, including P3, require a scaled score of 75 to pass.
ICC P3 Exam Overview: Format, References & Content Weights
The ICC Plumbing Plans Examiner (exam ID P3) is a national certification from the International Code Council. In ICC's description, the plumbing plans examiner reviews drawings, specifications and other documents from the design professional for compliance with the adopted codes, and answers code questions from designers and the public. The exam tests whether you can find and apply code text quickly, not whether you have memorized it.
Exam Format at a Glance
| Item | Detail (ICC exam catalog, checked October 2026) |
|---|---|
| Exam ID | P3, General Plans Examiner category, national certification |
| Questions | 60 multiple-choice questions |
| Time limit | 2.5 hours (150 minutes), or about 2.5 minutes per question |
| Book policy | Open book |
| Delivery | PRONTO (Proctored Remote Online Testing Option), taken in person or online with a remote proctor |
| Listed fee | $320 for PRONTO |
| Passing standard | Scaled score of 75, the standard for ICC national certification exams |
| Score report | Passing candidates see only "PASS"; failing candidates receive their numeric scaled score |
Code years: ICC lists the P3 exam for both the 2024 and 2021 code years. Choose the year your jurisdiction or employer requires, and study the matching books. This guide follows the 2024 editions, which renumbered many IPC sections. For example, the urinal substitution rule moved to IPC 424.2, water closet rules to 425, and the vent methods to 910 through 916.
Approved References (2024 Code Year)
- 2024 International Plumbing Code (IPC). It includes Resource A, plumbing provisions excerpted from ICC A117.1-2017.
- 2024 International Fuel Gas Code (IFGC).
- ICC A117.1-2017, Accessible and Usable Buildings and Facilities.
The 2021 code year uses the 2021 IPC and 2021 IFGC with ICC A117.1-2017. ICC provides digital access to one or more listed references during the exam at no extra cost.
What You May Bring
According to the catalog, you may bring copyrighted, bound books, including the approved references. Training materials such as presentations, study guides and practice questions are not permitted. All questions are based only on the approved references, and only those references can support a question appeal. Check the current ICC candidate bulletin for rules on tabs and highlighting before you mark up your books.
Content Domains and Weights
| Domain | Weight | ≈ Questions | Subtopics (Weight) | Guide Coverage |
|---|---|---|---|---|
| General Requirements | 5% | 3 | Piping protection (2%); piping installation (3%) | Chapters 1–2 |
| Fixtures | 15% | 9 | Fixtures and materials (2%); installation of fixtures (5%); installation of accessible fixtures (3%); inspection of accessible fixtures (5%) | Chapters 3–4 |
| Water Heaters | 10% | 6 | Safety devices (3%); piping, combustion air and venting, including fuel gas sizing (7%) | Chapter 5 |
| Water Supply | 19% | 11 | Materials (3%); supply piping installation (6%); protection of water supply, including water treatment (5%); nonpotable systems (5%) | Chapter 6 |
| Sanitary Drainage | 13% | 8 | Materials (3%); sizing drains and stacks (4%); sumps, ejectors, backwater valves and cleanouts (3%); indirect waste (3%) | Chapters 7–8, Section 10.3 |
| Vents | 15% | 9 | Materials, joints and grades (5%); sizing and installation (10%) | Chapter 9 |
| Traps | 11% | 7 | Traps, interceptors and separators (7%); chemical treatment and neutralization (4%) | Chapter 10 |
| Storm | 7% | 4 | Roof drains, conductors and leaders (4%); sumps and subdrains (3%) | Chapter 11 |
| Health Care Plumbing | 5% | 3 | Installation of fixtures (2%); protection of water supply (3%) | Chapter 12 |
Question counts are the weights applied to 60 questions and rounded; ICC does not publish exact counts per domain.
Takeaways from the weights:
- Water Supply (19%) is the largest domain. It includes nonpotable water (IPC Chapter 13) and water treatment, which are easy to skip.
- Fixtures (15%) puts 8 percent on accessible fixtures, so ICC A117.1 clearances, grab bars and heights matter.
- The 7 percent Water Heaters subtopic covers IFGC fuel gas pipe sizing, combustion air and venting, so bring the IFGC and practice the Table 402.4 sizing tables.
- Vents (15%) places 10 percent on sizing and installation, including the trap-to-vent distances, wet vents, circuit vents and vent stack tables.
Working an Open-Book Exam in 150 Minutes
With about 2.5 minutes per question, you cannot read a chapter to answer one question. Successful candidates:
- Know where things are. Learn the IPC chapter layout: Chapter 3 general regulations, 4 fixtures, 5 water heaters, 6 water supply, 7 drainage, 8 indirect waste, 9 vents, 10 traps and interceptors, 11 storm, 12 medical gas, 13 nonpotable water and 14 subsurface graywater. Appendix E covers water pipe sizing.
- Use the index. Look up keywords such as "cleanout," "vacuum breaker" or "scupper" instead of paging through chapters.
- Memorize the tables you use most. Table 403.1 (fixture counts), Table 709.1 (DFUs), Tables 710.1(1) and 710.1(2) (drain sizing), Table 909.1 (trap-to-vent distances), Table 1106.2 (storm piping) and IFGC Table 402.4(1) appear repeatedly.
- Make two passes. Answer the questions you know first, flag the calculation-heavy ones, and return to them with the time left.
- Watch the edition. Questions follow the code year you registered for. A section number from a 2018 or 2021 study aid may point to a different rule in the 2024 code.
How to Use This Guide
Each section ends with a plans examiner checklist and practice questions that cite the 2024 section numbers. Work through the chapters in outline order, and tab the matching code sections in your own books as you go.
According to the ICC exam catalog, how many questions and how much time does the P3 Plumbing Plans Examiner exam allow?
100 questions in 3 hours
80 questions in 2 hours
60 questions in 2.5 hours
60 questions in 2 hours
Which item may a candidate bring to the P3 exam, according to the ICC catalog comment?
A copyrighted, bound copy of the 2024 International Plumbing Code
A binder of practice questions with answers from a prep course
Presentation slides from a code-prep class
A printed commercial study guide written specifically for the P3 exam
Which content domain carries the largest weight on the P3 exam outline?
Fixtures, at 15 percent
Vents, at 15 percent
Water Supply, at 19 percent
Sanitary Drainage, at 13 percent
What score does ICC require to pass a national certification exam such as the P3?
70 percent of questions answered correctly
A raw score of 45 out of 60
A scaled score of 80
A scaled score of 75
Sections you finish are checked off in the contents.