ICC Plumbing Plans Examiner - P3 Exam Prep Guide

The ICC Plumbing Plans Examiner - P3 examination is designed for plumbing plans examiners, inspectors, code officials, building department employees, plumbers, engineers, designers, contractors, and other professionals responsible for reviewing plumbing construction documents.

The exam evaluates a candidate’s ability to review fixture schedules, water-supply calculations, drainage layouts, vent systems, storm drainage, water heaters, interceptors, special piping, fuel-gas systems, accessibility details, and other proposed plumbing work for code compliance.

The ICC Plumbing Plans Examiner - P3 exam prep collection includes a books and courses rental package, professionally highlighted and tabbed references, online exam preparation, and a complete exam book package.

Available P3 Exam Prep Packages

• ICC Plumbing Plans Examiner - P3 - Books & Courses Rental Package: $940.00 sale price, reduced from $1,240.00
• ICC Plumbing Plans Examiner - P3 Highlighted & Tabbed Book Package: $645.00 sale price, reduced from $845.00
• ICC Plumbing Plans Examiner - P3 - Online Exam Prep: $295.00 sale price, reduced from $395.00
• ICC Plumbing Plans Examiner - P3 Exam Book Package: $395.00 sale price, reduced from $495.00

The rental package combines temporary reference access with structured online preparation. The highlighted and tabbed package supports faster code navigation. Online exam prep is suitable for candidates who already own the correct books, while the exam book package supports independent study and permanent reference ownership.

Books & Courses Rental Package

The ICC Plumbing Plans Examiner - P3 Books & Courses Rental Package combines access to the listed plumbing, fuel-gas, and accessibility references with organized online exam preparation.

The package is listed at a sale price of $940.00, reduced from the regular price of $1,240.00.

This option may be appropriate for candidates who:

• Need the reference books and online course together
• Do not currently own the listed publications
• Want an organized plumbing plan-review study plan
• Need practice using code tables and calculations
• Want help analyzing plumbing construction documents
• Prefer temporary book access instead of permanent ownership

Candidates should review the current product page for rental duration, course access, shipping terms, deposit requirements, and book-return instructions.

Highlighted & Tabbed Book Package

The ICC Plumbing Plans Examiner - P3 Highlighted & Tabbed Book Package provides professionally organized references for candidates who want to begin studying without locating and marking every important section themselves.

The package is listed at a sale price of $645.00, reduced from the regular price of $845.00.

The prepared references may help candidates locate:

• Construction-document requirements
• Commercial plumbing fixture tables
• Accessible fixture and toilet-room provisions
• Water heater requirements
• Water-supply sizing tables
• Sanitary drainage and venting provisions
• Trap, interceptor, and separator requirements
• Storm drainage tables
• Fuel-gas piping and venting requirements

Highlights and tabs can improve navigation speed, but candidates must still understand definitions, exceptions, diagrams, table notes, and the relationship between different code provisions.

Online Exam Prep

The ICC Plumbing Plans Examiner - P3 Online Exam Prep course provides flexible preparation for candidates who already own the correct references or plan to purchase them separately.

The course is listed at a sale price of $295.00, reduced from the regular price of $395.00.

Online preparation may help candidates:

• Review P3 subjects in a structured order
• Practice navigating plumbing and fuel-gas codes
• Apply code requirements to plans and diagrams
• Review fixture-count and accessibility questions
• Practice water-supply and drainage calculations
• Study venting, storm drainage, and special systems
• Complete exam-style practice questions
• Build speed for timed open-book testing

The course is most effective when candidates work directly from the same code editions selected for their scheduled examination.

Exam Book Package

The ICC Plumbing Plans Examiner - P3 Exam Book Package provides the printed references associated with the current preparation collection.

The package is listed at a sale price of $395.00, reduced from the regular price of $495.00.

This option may be suitable for candidates who:

• Prefer independent book-based preparation
• Want permanent ownership of the references
• Already understand plumbing systems and plan reading
• Want to create a personalized tab and highlighting system
• Already have separate training or practice examinations
• Need the publications for continued professional use

What Is the ICC P3 Examination?

The P3 examination is the ICC Plumbing Plans Examiner national certification exam. It evaluates whether a candidate can review proposed plumbing and related fuel-gas systems before construction and determine whether the submitted documents comply with applicable code requirements.

Current official ICC information lists:

• 60 examination questions
• Two-hour-and-30-minute time limit
• National certification examination
• Scaled passing score of 75

A scaled score of 75 is not the same as answering exactly 75% of the questions correctly. ICC uses scaled scoring to maintain a consistent passing standard across different examination forms.

Current product information describes P3 as an open-book examination. Candidates should confirm the code cycle, approved references, testing method, and exam-day book rules before registering.

P3 Study References

ICC’s 2021 P3 study guide identifies the following publications:

• International Plumbing Code, 2021 Edition
• International Fuel Gas Code, 2021 Edition

The current 1 Exam Prep package also includes:

• ICC A117.1-2017 Accessible and Usable Buildings and Facilities

The International Plumbing Code supports preparation involving fixtures, water heaters, water supply, sanitary drainage, vents, traps, interceptors, indirect waste, storm drainage, special piping, and health care plumbing.

The International Fuel Gas Code supports preparation involving gas piping, connected appliance demand, pipe sizing, valves, regulators, combustion air, appliance connections, chimneys, vents, and pressure testing.

ICC A117.1-2017 supports accessibility-related plan review involving fixture placement, toilet-room layouts, clear floor spaces, turning spaces, approach clearances, grab bars, reach ranges, and accessible bathing facilities.

How the References Work Together

• Use the International Plumbing Code for most plumbing-system design and plan-review questions.
• Use the International Fuel Gas Code for gas piping, fuel-fired appliances, combustion air, regulators, chimneys, and vents.
• Use ICC A117.1-2017 for accessibility-related plumbing layouts, dimensions, clearances, and usability requirements.

Some projects involve all three areas. A commercial toilet room with an accessible water closet and a gas-fired water heater may require plumbing, accessibility, and fuel-gas review.

What Does a Plumbing Plans Examiner Do?

A plumbing plans examiner evaluates proposed systems before installation begins. The goal is to identify missing information, calculation errors, unsafe designs, and code conflicts during the permit-review process.

Common responsibilities may include:

• Reviewing plumbing plans and specifications
• Checking plumbing fixture quantities
• Reviewing accessible toilet-room layouts
• Evaluating water-service and distribution sizing
• Checking sanitary drainage and vent designs
• Reviewing indirect and special waste systems
• Evaluating grease interceptors and separators
• Checking storm drainage calculations
• Reviewing gas piping diagrams and appliance loads
• Preparing plan-review correction comments
• Coordinating with building, mechanical, electrical, and fire reviewers
• Verifying corrections during resubmittal review

P3 Plans Examiner Versus P2 Inspector

• P3 Plumbing Plans Examiner: Reviews proposed drawings, specifications, schedules, calculations, and system diagrams before construction or permit approval.
• P2 Commercial Plumbing Inspector: Evaluates installed plumbing work in the field for compliance with approved plans and adopted codes.

The plans examiner focuses on whether the proposed design is complete and code compliant. The inspector focuses on whether the installed work matches the approved design and applicable requirements.

Major P3 Study Areas

ICC’s 2021 study guide emphasizes the following topics:

• General requirements
• Plumbing fixtures
• Water heaters
• Water supply and distribution
• Sanitary drainage
• Vents
• Traps, interceptors, and separators
• Special piping and storage systems
• Storm drainage
• Health care plumbing
• Fuel-gas coordination
• Plan-review procedures

Construction Documents

A plumbing plan set should contain enough information for the examiner to evaluate every proposed system.

Submitted documents may include:

• Plumbing floor plans
• Fixture schedules
• Water-supply riser diagrams
• Sanitary drainage and vent risers
• Storm drainage plans
• Gas piping diagrams
• Equipment schedules
• Water heater details
• Interceptor and separator details
• Accessible toilet-room plans
• Specifications and product information
• Supporting calculations

Missing pipe sizes, fixture loads, elevations, equipment ratings, design pressures, or connection details can prevent a complete code review.

General Plumbing Requirements

General requirements establish the foundation for materials, installation, inspections, protection, testing, and approval.

Study subjects may include:

• Approved plumbing materials
• Equipment listing and labeling
• Manufacturer installation instructions
• Structural penetrations
• Pipe protection
• Support and anchorage
• Protection from freezing
• Trenching and bedding
• Required inspections
• System testing

Plumbing Fixture Counts

Commercial plans must provide the required number and type of plumbing fixtures based on occupancy and occupant load.

A practical fixture-count review includes:

• Identify each occupancy classification
• Determine the applicable occupant load
• Select the correct plumbing fixture table
• Calculate required water closets and urinals
• Calculate required lavatories
• Determine drinking fountain requirements
• Confirm required service sinks
• Review separate-facility requirements
• Apply permitted substitutions
• Read all table notes and exceptions

Accessible Plumbing Layouts

Plans examiners should verify that required accessible fixtures are located and detailed correctly.

Accessibility review may include:

• Accessible routes into toilet rooms
• Door maneuvering clearances
• Water closet locations
• Water closet clearances
• Grab-bar dimensions and placement
• Lavatory knee and toe clearances
• Accessible urinal dimensions
• Turning spaces
• Accessible shower compartments
• Bathtub clearances
• Reach ranges
• Protection of pipes beneath accessible fixtures

Water Heaters

Water heater plans should provide the information needed to evaluate capacity, location, protection, relief, drainage, fuel supply, and venting.

Study subjects may include:

• Equipment listing and labeling
• Installation location
• Service access
• Drain pans
• Temperature and pressure relief valves
• Relief discharge piping
• Thermal expansion control
• Hot-water demand
• Gas piping
• Combustion air
• Chimneys and vents
• Physical or seismic protection where required

Water Supply and Distribution

Water supply plans must show that the proposed system can provide adequate flow and pressure to all fixtures and equipment.

Study subjects may include:

• Water service piping
• Water distribution piping
• Available water pressure
• Developed piping length
• Elevation changes
• Water supply fixture units
• Pipe sizing
• Pressure-reducing valves
• Booster systems
• Shutoff valves
• Water hammer control
• Hot-water circulation

Water Distribution Pipe Sizing

A practical water distribution review includes:

• Identify the available supply pressure
• Determine the developed piping length
• Account for elevation loss or gain
• Calculate the connected fixture-unit demand
• Identify the proposed piping material
• Select the correct sizing method or table
• Verify service and branch sizes
• Confirm minimum fixture supply sizes
• Review table notes and design assumptions

The plans should provide enough design information for the examiner to confirm that the system has adequate residual pressure.

Backflow and Cross-Connection Protection

Plans must protect the potable water system from contamination and pollution.

Backflow review may involve:

• Air gaps
• Atmospheric vacuum breakers
• Pressure vacuum breakers
• Reduced-pressure assemblies
• Double-check assemblies
• Hose connection backflow preventers
• Degree-of-hazard evaluation
• Fire protection system connections
• Irrigation systems
• Special equipment connections
• Accessibility for testing and maintenance

Sanitary Drainage

Sanitary drainage plans should identify fixture loads, pipe sizes, slopes, changes in direction, cleanouts, and discharge points.

Important subjects include:

• Drainage fixture units
• Horizontal branches
• Drainage stacks
• Building drains
• Building sewers
• Horizontal drainage slope
• Drainage fittings
• Cleanouts
• Backwater valves
• Sewage pumps and ejectors
• Testing

Drainage Fixture-Unit Calculations

A practical drainage review includes:

• Identify each connected fixture
• Determine the drainage fixture-unit value
• Total the load on each branch
• Determine the load on each stack
• Verify building drain and sewer sizes
• Check branch interval limitations
• Confirm horizontal pipe slope
• Review table notes and special fixture requirements

Indirect and Special Waste

Indirect waste systems protect food, equipment, and potable systems by providing an approved separation from the drainage system.

Applications may include:

• Food-preparation equipment
• Commercial dishwashers
• Ice machines
• Refrigeration equipment
• Clear-water waste
• Water heater relief discharge
• Cooling equipment
• Sterilizers
• Special process equipment
• Condensate drainage

Plans should show the required air gap, air break, receptor, trap, vent, and connection arrangement.

Vent Systems

Vent systems protect trap seals and support proper drainage-system operation.

Study subjects may include:

• Individual vents
• Common vents
• Wet vents
• Circuit vents
• Vent stacks
• Stack vents
• Relief vents
• Combination waste and vent systems
• Air admittance valves where permitted
• Vent sizing
• Vent terminals

Vent Sizing

A practical vent-sizing review includes:

• Identify the proposed venting method
• Determine the connected drainage fixture units
• Determine the developed vent length
• Identify the required drainage pipe size
• Select the correct sizing table
• Verify minimum vent diameter
• Review horizontal vent slope
• Confirm roof or exterior termination
• Check frost-closure requirements where applicable

Traps, Interceptors, and Separators

Plans examiners should verify that fixtures and special waste streams receive the appropriate protection before connecting to the drainage system.

Systems may include:

• Fixture traps
• Trap primers
• Grease interceptors
• Hydromechanical grease interceptors
• Gravity grease interceptors
• Oil separators
• Sand interceptors
• Lint interceptors
• Plaster interceptors
• Special process separators

Review considerations may include sizing, flow rate, venting, accessibility, maintenance space, flow-control devices, and connection arrangements.

Storm Drainage

Storm drainage plans should show how rainwater will be collected and safely discharged.

Study subjects may include:

• Roof drainage areas
• Rainfall rates
• Roof drains
• Secondary roof drainage
• Overflow drains
• Scuppers
• Leaders and conductors
• Horizontal storm piping
• Subsoil drainage
• Sumps and pumps
• Discharge locations

Storm Drainage Calculations

A practical storm-drainage review includes:

• Determine the contributing roof area
• Include vertical wall areas where required
• Identify the applicable rainfall rate
• Divide the area among drains or scuppers
• Select the correct sizing table
• Verify vertical conductor sizes
• Verify horizontal storm piping sizes
• Confirm secondary drainage capacity
• Review overflow elevations and discharge locations

Fuel-Gas Plans

Fuel-gas plans should provide enough information to verify the complete piping and appliance system.

Plan-review subjects may include:

• Fuel type
• System pressure
• Connected appliance demand
• Developed piping length
• Pipe material and sizes
• Regulators
• Shutoff valves
• Appliance connections
• Sediment traps
• Combustion air
• Chimneys and vents
• Pressure testing

Fuel-Gas Pipe Sizing

A practical fuel-gas review includes:

• List all connected appliances
• Determine each appliance input rating
• Calculate the demand on each pipe section
• Determine the design pressure and pressure drop
• Determine the developed piping length
• Select the correct fuel and piping-material table
• Verify each proposed pipe size
• Confirm regulator and appliance pressure requirements

Candidates should avoid mixing natural gas, propane, low-pressure, and elevated-pressure sizing tables.

Health Care Plumbing

Health care projects may contain specialized systems and fixtures requiring detailed plan review.

Study subjects may include:

• Clinical sinks
• Bedpan washers
• Special waste systems
• Medical gas piping
• Medical vacuum systems
• Pipe materials and identification
• Valves and zone controls
• Testing and verification
• Special fixture connections
• Equipment rooms and service areas

Candidates should focus on the requirements contained within the official examination scope and listed references.

Practical Plumbing Plan-Review Process

• Confirm the project scope and applicable code cycle
• Review the cover sheet and code summary
• Identify occupancy classifications and occupant loads
• Review plumbing fixture counts
• Check accessible plumbing layouts
• Review the water service and distribution system
• Check sanitary drainage and vent risers
• Review indirect waste and interceptor systems
• Check storm drainage calculations
• Review fuel-gas piping and appliance information
• Coordinate with other plan-review disciplines
• Prepare clear correction comments with code references
• Verify corrections during resubmittal review

Common Plumbing Plan Deficiencies

• Incomplete fixture schedules
• Incorrect plumbing fixture counts
• Missing accessible fixture dimensions
• Incomplete water-supply calculations
• Insufficient residual water pressure
• Undersized drainage or vent piping
• Missing cleanouts
• Improper venting arrangements
• Incomplete interceptor details
• Missing storm drainage calculations
• Insufficient secondary roof drainage
• Incorrect gas piping sizes
• Missing combustion-air information
• Conflicts between plans, risers, and equipment schedules

Open-Book Exam Navigation

With 60 questions and a two-hour-and-30-minute limit, candidates have an average of approximately two minutes and 30 seconds per question.

A practical lookup method includes:

• Read the complete question
• Identify whether the issue involves plumbing, fuel gas, or accessibility
• Select the correct reference
• Identify the primary keyword
• Use the index or table of contents
• Locate the complete section, table, or diagram
• Review definitions, exceptions, and footnotes
• Apply the requirement to the proposed design
• Move on when one question is consuming too much time

Organizing the P3 References

A practical tab system may include:

• IPC administration
• IPC general requirements
• IPC fixtures
• IPC water heaters
• IPC water supply
• IPC backflow protection
• IPC sanitary drainage
• IPC indirect waste
• IPC vents
• IPC traps and interceptors
• IPC storm drainage
• IPC special piping
• IFGC gas piping
• IFGC sizing tables
• IFGC combustion air
• IFGC chimneys and vents
• A117.1 toilet rooms
• A117.1 bathing facilities
• A117.1 fixture clearances

Candidates should verify current ICC rules before adding tabs, highlighting, handwritten notes, or inserted materials.

Recommended P3 Study Plan

• Confirm the current P3 code cycle and reference list
• Learn the organization of each publication
• Review construction-document requirements
• Practice plumbing fixture-count calculations
• Study accessible toilet and bathing facilities
• Review water heaters and fuel-fired equipment
• Practice water distribution sizing
• Study backflow and nonpotable water systems
• Practice sanitary drainage calculations
• Review venting methods and vent sizing
• Study traps, interceptors, and indirect waste
• Practice storm drainage calculations
• Review gas piping and combustion air
• Practice complete plan-review scenarios
• Complete timed reference-navigation exercises

Which P3 Package Should You Choose?

• Choose the Books & Courses Rental Package for temporary access to the references combined with structured online preparation.
• Choose the Highlighted & Tabbed Book Package for professionally organized plumbing, fuel-gas, and accessibility publications.
• Choose Online Exam Prep when you already own the correct books and want guided preparation.
• Choose the Exam Book Package for independent study and permanent ownership of the references.

FAQ

Q. What is the ICC Plumbing Plans Examiner - P3 exam?

A. It is an ICC national certification examination that evaluates a candidate’s ability to review plumbing and related fuel-gas construction documents for code compliance.

Q. How much does the Books & Courses Rental Package cost?

A. The sale price is $940.00, reduced from the regular price of $1,240.00.

Q. How much does the Highlighted & Tabbed Book Package cost?

A. The sale price is $645.00, reduced from the regular price of $845.00.

Q. How much does the P3 Online Exam Prep course cost?

A. The sale price is $295.00, reduced from the regular price of $395.00.

Q. How much does the P3 Exam Book Package cost?

A. The sale price is $395.00, reduced from the regular price of $495.00.

Q. Which publications does ICC identify for the 2021 P3 study guide?

A. ICC identifies the 2021 International Plumbing Code and 2021 International Fuel Gas Code.

Q. What additional publication is included in the current package?

A. The current package also includes ICC A117.1-2017 for accessibility-related plan review.

Q. How many questions are on the P3 examination?

A. Official ICC information currently lists 60 questions.

Q. How much time is allowed?

A. Official ICC information currently lists a two-hour-and-30-minute limit.

Q. What score is required to pass?

A. ICC national certification examinations use a scaled passing score of 75. This is not the same as a raw score of 75%.

Q. Is the P3 exam open book?

A. Current package information describes P3 as an open-book examination. Candidates should verify ICC’s current reference-use rules before testing.

Q. What subjects should I study?

A. Study fixtures, accessibility, water heaters, water supply, drainage, vents, traps, interceptors, storm drainage, health care plumbing, fuel gas, and plan-review procedures.

Q. What is the difference between P2 and P3?

A. P2 focuses on field inspection of installed commercial plumbing work, while P3 focuses on reviewing proposed construction documents before installation.

Q. Should I practice fixture-count calculations?

A. Yes. Candidates should practice occupancy classification, occupant load, water closets, lavatories, drinking fountains, service sinks, and permitted substitutions.

Q. Should I practice water-supply and drainage sizing?

A. Yes. Water distribution, sanitary drainage, venting, and storm drainage calculations are important plan-review subjects.

Q. Should I study accessibility?

A. Yes. Review accessible toilet rooms, fixture clearances, turning spaces, grab bars, lavatories, urinals, showers, bathtubs, and reach ranges.

Q. Does passing P3 automatically authorize me to work as a plumbing plans examiner?

A. No. A jurisdiction or employer may also require experience, appointment, additional certifications, education, background qualifications, or local approval.

Q. Where can I purchase the P3 exam prep packages?

A. The available products can be found in the ICC Plumbing Plans Examiner - P3 exam prep collection.

Conclusion

The ICC Plumbing Plans Examiner - P3 examination requires candidates to combine plumbing-system knowledge with accurate review of drawings, schedules, calculations, specifications, and code requirements.

Important preparation subjects include fixture counts, accessibility, water heaters, water supply, backflow protection, sanitary drainage, vents, traps, interceptors, storm drainage, health care plumbing, fuel-gas piping, calculations, and plan-review documentation.

1 Exam Prep offers rental books with course access, highlighted and tabbed references, online exam preparation, and an exam book package for different preparation needs and budgets.

Shop ICC Plumbing Plans Examiner - P3 Exam Prep

Key Takeaways

• P3 is the ICC Plumbing Plans Examiner national certification examination.
• The Books & Courses Rental Package sale price is $940.00.
• The Highlighted & Tabbed Book Package sale price is $645.00.
• The Online Exam Prep sale price is $295.00.
• The Exam Book Package sale price is $395.00.
• Official ICC information lists 60 questions and a two-hour-and-30-minute limit.
• ICC national certification exams use a scaled passing score of 75.
• ICC’s 2021 study guide identifies the 2021 IPC and 2021 IFGC.
• The current package also includes ICC A117.1-2017.
• P3 focuses on reviewing proposed plumbing construction documents.
• Major subjects include fixtures, water supply, drainage, vents, storm drainage, fuel gas, and accessibility.
• Passing P3 does not automatically provide plan-review authority in every jurisdiction.
• Candidates should verify the current code cycle and local qualification requirements before registering.