Idaho Plumbing Specialty Contractor Exam

Idaho Plumbing Specialty Contractor Exam: Complete 2026 Study Guide

You've put in the hours on the job. Now it's time to make it official. The Idaho Plumbing Exam is the final step between you and your plumbing specialty contractor license — and with the right preparation, it's absolutely within reach. This guide covers everything you need to know: exam structure, topic breakdowns, reference materials, registration steps, and study strategies that actually work. Whether you're just starting to prepare or looking for a final review, you're in the right place.

Idaho Plumbing Specialty Contractor Exam Overview

The exam is administered by PSI and consists of 100 scored questions. You have 240 minutes (4 hours) to complete it — which is generous, but not unlimited. The passing score is 75, meaning you need to answer at least 75 questions correctly.

This is an open-book exam. You may bring the official reference manual (more on that below), but the questions are written to test genuine understanding, not just your ability to find a page. Candidates who try to look up every answer typically run out of time.

The exam fee is $75.00 per attempt, and fees are non-refundable and non-transferable. Your payment is valid for one year from the date of purchase.

You can register online through PSI's exam registration page — available 24 hours a day — or by calling PSI at 855-340-3713. Online registration is the fastest option.

Topics Covered on the Idaho Plumbing Specialty Contractor Exam

All exam content comes from the Division of Occupational & Professional Licenses (DOPL) Contractor's Business and Law Reference Manual. Here's how the 100 questions are distributed across the 13 sections:

• Sections 5, 6, and 7 are the heaviest hitters — 20 questions each, accounting for 60% of the exam on their own.
• Section 10 (Project Management) carries 10 questions.
• Section 9 (Contracts) and Section 8 (Estimating) contribute 8 and 7 questions respectively.
• Section 11 (OSHA) contributes 5 questions.
• Sections 2, 3, 4, and 13 each carry 2 questions; Sections 1 and 12 carry 1 each.

When deciding where to invest your study time, follow the question weights. Sections 5, 6, and 7 deserve the most attention by a wide margin.

Section 5 – Financial Management (20 questions): Balance sheets, income statements, and cash flow statements. Cash vs. accrual accounting. Financial ratios covering liquidity, efficiency, leverage, and profitability. Depreciation methods including straight-line and MACRS.

Section 6 – Employment Law (20 questions): Federal anti-discrimination laws (Title VII, ADEA, ADA, EPA, GINA, Pregnancy Discrimination Act), FMLA leave rules, FLSA wage and overtime requirements, Idaho-specific wage payment laws, and federal contractor labor standards like Davis-Bacon.

Section 7 – Insurance and Bonds (20 questions): Liability, builder's risk, automobile, and property insurance. Idaho workers' compensation requirements. Surety bonds — bid, performance, and payment. Unemployment insurance and independent contractor classification.

Section 10 – Project Management (10 questions): The five phases of project management, Critical Path Method (CPM), Gantt charts, float time, cost control, and key personnel roles.

Sections 8 and 9 cover estimating processes and construction contracts — including Idaho-specific statutes on retention proceeds and the Statute of Frauds.

Sample Questions

Here's a look at the style of questions you'll encounter on the Idaho Plumbing Specialty questions portion of this exam. These are representative examples — see if you can work through them before checking your knowledge with our practice exam.

Sample Question 1:
A contractor is reviewing their financial statements and wants to assess how quickly the business can meet short-term obligations using only its most liquid assets. Which financial ratio would best serve this purpose?

• A) Debt-to-equity ratio
• B) Quick ratio
• C) Return on assets
• D) Gross profit margin

Sample Question 2:
Under Idaho Code 45-501, a subcontractor who has not been paid for labor and materials has the right to file what type of claim against the property?

• A) Lis pendens
• B) Mechanic's or materialman's lien
• C) Judgment lien
• D) Deed of trust

Think through each question carefully — what concept is it actually testing? Start with our free practice exam to see how your knowledge stacks up across the full topic range.

What Types of Questions to Expect

Our full practice question bank covers all 13 sections, with 490 practice questions total. Here's what each section tests and how many practice questions we offer:

• Section 1 (23 questions): Business plan components, Idaho licensing requirements, and the consequences of working without a license.
• Section 2 (25 questions): Business entity types, checklists for starting a contractor business, and working with professional advisors.
• Section 3 (11 questions): Liability characteristics of each entity type, Idaho Secretary of State registration requirements, and S Corp vs. C Corp tax treatment.
• Section 4 (6 questions): DOPL's mission, license qualification and application, and selecting accountants and attorneys.
• Section 5 (72 questions): Financial recordkeeping, statement analysis, accounting methods, ratio calculations, and depreciation.
• Section 6 (60 questions): Applying federal employment and anti-discrimination laws, FMLA scenarios, wage and hour compliance, and federal contractor standards.
• Section 7 (74 questions): Insurance coverage types, workers' comp requirements and penalties in Idaho, bond types, UI liability, and contractor vs. employee classification.
• Section 8 (45 questions): Bid types, bidding decisions, estimating methods (conceptual, preliminary, and detailed), and quantity takeoff procedures.
• Section 9 (42 questions): Contract elements, construction contract types, Idaho Code on retention proceeds, and Statute of Frauds requirements.
• Section 10 (62 questions): Project management phases, CPM and Gantt scheduling, float calculations, cost variance analysis, and personnel roles.
• Section 11 (38 questions): OSHA recordkeeping forms (300, 300A, 301), fatality/hospitalization reporting, workplace posting requirements, and voluntary protection programs.
• Section 12 (18 questions): Federal and Idaho income tax obligations by entity type, sales and use tax for contractors, and employment tax forms.
• Section 13 (14 questions): Filing deadlines and requirements for mechanic's liens, lien priority rankings, enforcement proceedings, and release by surety bond.

Required Study Materials

The one book you must have is the Division of Occupational & Professional Licenses Contractor's Business and Law Reference Manual. This is the only reference allowed in the exam room, and all 100 questions are drawn directly from it. Download the PDF from the state licensing website, then print it, hole-punch it, and place it in a three-ring loose-leaf binder before exam day. This is a firm requirement — a spiral-bound or unbound printed copy will not be accepted.

Pre-exam preparation of your manual is where many candidates gain a real edge. You may highlight, underline, and add permanent index tabs before the exam. No writing is permitted during the exam session, and temporary markers like Post-it notes will be confiscated. Plan your indexing carefully — a well-organized binder can save you several minutes on exam day.

For highlighting, we recommend Sharpie Tank Highlighters — the wide barrel, large ink supply, and assorted fluorescent colors (pink, yellow, green, orange, lavender, and blue) make color-coded section marking straightforward and consistent. They resist smearing, which matters when you're working through a thick printed document.

Study Tips for the Idaho Plumbing Specialty Contractor Exam

Weight your study time correctly. Sections 5, 6, and 7 together make up 60 questions. Master those three sections first, then work outward. Spending equal time on a 1-question section and a 20-question section is a poor return on your effort.

Use timed practice, not just passive reading. Our full practice exam matches the real PSI Plumbing prep exam format exactly — 100 questions, 240 minutes, same topic breakdown. Practicing under those conditions now means you'll already know your pace when you sit for the real thing. Untimed PDF review builds familiarity with the content, but it doesn't prepare you to manage a 4-hour exam.

Don't track your score mid-exam. Your license won't show your exam score — a 75 and a 98 are the same credential. Aim to pass, not to be perfect. Counting questions as you go creates anxiety that costs more points than it's worth.

Prepare your binder strategically. Color-code sections by topic, add tabs at major section breaks, and highlight key definitions and formulas before exam day. Your binder is a tool — treat it like one.

Start free, then go deep. Our free practice exam gives you 10 questions at no cost — a good way to assess your starting point and get comfortable with the format. When you're ready for serious preparation, the full practice exam draws from a large pool of 490 questions, giving you a different set of questions on every attempt and a detailed score breakdown by section.

Frequently Asked Questions

How much does the Idaho Plumbing Specialty Contractor Exam cost?
The exam fee is $75.00 per attempt. Fees are non-refundable and non-transferable. Your payment is valid for one year from the date of purchase, so register when you're ready to test.

How many questions are on the exam, and how long do I have?
The exam has 100 questions and a 240-minute (4-hour) time limit.

What is the passing score?
You need a minimum score of 75 — that's 75 correct answers out of 100.

How do I register?
Register online through PSI's exam registration page (available 24/7) or by calling PSI at 855-340-3713. Online registration is the fastest option.

Is the Idaho Plumbing Exam open book?
Yes. The only permitted reference is the DOPL Contractor's Business and Law Reference Manual, which must be printed, hole-punched, and placed in a three-ring loose-leaf binder prior to your exam date.

Can I write in my manual during the exam?
No. Pre-exam highlighting, underlining, and permanent indexing are permitted, but no writing is allowed once the exam session begins. Post-it notes and additional papers are prohibited and will be confiscated. Any candidate found writing in their materials will have their binder seized and be reported to the Division.

What ID do I need?
One government-issued photo ID that includes your name, signature, and photograph and is not expired. Acceptable forms: state-issued driver's license, state-issued ID card, U.S. passport, U.S. military ID, or U.S. Alien Registration Card.

What happens if I fail?
You may retake the exam as many times as needed, with an exam fee required for each attempt. Your score report includes a diagnostic breakdown showing your performance by section — use that to guide your next round of studying.

How do I cancel or reschedule?
You must cancel at least 2 business days before your scheduled date to avoid forfeiting your fee. Contact PSI by phone at 855-340-3713 or through the PSI website. Voicemail and email are not accepted cancellation methods.

Where can I take the exam?
PSI testing centers in Idaho (Boise, Lewiston, Moscow, Twin Falls, Idaho Falls, and others), as well as locations in Washington, Oregon, Wyoming, and Nevada.

Ready to Get Started?

The Idaho Plumbing Specialty Contractor Exam is thorough, but it's designed to be passed by working professionals who prepare methodically. Print your manual, build your binder, focus on Sections 5, 6, and 7, and practice under real timed conditions.

Take our free practice exam today to see where you stand — no account required. When you're ready to go deeper, the full practice exam puts all 490 questions to work for you. Your license is closer than you think.