Electrical Contractor
Scope: Statewide commercial and residential electrical installations
Testing: PSI exam referencing the 2023 NEC with Idaho amendments, OSHA 1926, and DOPL law
Idaho Contractor License Exam Guide (2026)
Southwest Idaho’s semi-arid climate cracks unreinforced slabs while the Panhandle handles 200 PSF snow loads and the Snake River Plain sits atop seismic faults. Idaho trade exams check that you can anchor for uplift, insulate against 60-inch frost lines, and follow Division statutes to the letter.
Last verified: May 2026 via Idaho Division of Occupational and Professional Licenses. Official source: Idaho Division of Occupational and Professional Licenses.
- 80 QuestionsTrade module
- 3 HoursPSI time limit
- 70% PassingState minimum
How Idaho licenses contractors
Idaho’s Division of Occupational and Professional Licenses (DOPL) regulates electrical, plumbing, and HVAC contractor licenses statewide. PSI (test-takers.psiexams.com/idcon) delivers the exams.
Mountain counties demand ice-dam detailing and avalanche-resistant roofs, Boise Valley jobs battle expansive clays and heat, and eastern Idaho sits in high seismic risk. Exams include frost-depth insulation, ASCE 7 snow load math, and wildfire defensible space planning.
Official source: Idaho Division of Occupational and Professional Licenses
Idaho licensing at a glance
- 80 Questions — Trade module
- 3 Hours — PSI time limit
- Typical cost: Application fees vary by trade (typically $35–$50) plus background checks
- State-specific trade exam required (NASCLA not accepted for primary licensing path)
- Common license path: Electrical Contractor
Idaho contractor license types
Plumbing Contractor
Scope: Potable water, DWV, medical gas, and hydronic systems
Testing: Trade exam based on the 2021 UPC with Idaho amendments plus Idaho Code Title 54
HVAC Contractor
Scope: Mechanical systems, fuel gas, hydronics, and refrigeration
Testing: Exam referencing the 2021 IMC/IFGC, NFPA 54/58, and Idaho HVAC statutes
Each contractor license requires a bond ($2,000 plumbing/HVAC, $10,000 electrical), liability insurance, and proof of journeyman-level experience under an Idaho-licensed contractor.
What's on the Idaho contractor exam
PSI test centers operate in Boise, Coeur d—Alene, Pocatello, Twin Falls, and Nampa with limited remote proctoring.
What Idaho exam questions emphasize
- Frost-protected shallow foundation details and insulation R-values
- Snow-load calculations for 150–200 PSF roof zones and drift conditions
- Seismic bracing for piping, conduit, and rooftop units
- Idaho-specific permitting, inspection, and licensing statutes (Idaho Code Title 54, Chapter 10/26)
Exam-day logistics
- Bring two IDs and your DOPL authorization; names must match exactly
- Reference materials must be bound—no 3-ring binders or loose pages
- Failing candidates can retest after 7 days; scores remain valid for one year
Idaho contractor exam blueprint (verified July 2026)
| Licensing authority | Idaho Division of Occupational and Professional Licenses (DOPL) |
|---|---|
| What is licensed | Electrical, plumbing, and HVAC contractor licenses statewide; building GC rules often municipal |
| Exams | PSI trade exams (~$80/attempt typical—confirm bulletin) |
| NASCLA | Not accepted |
| Money | Application fees typically $35–$50 plus background checks; PSI exam fees at scheduling |
| Key gotcha | Statewide trade license ≠ automatic city contractor registration—check the AHJ where you will pull permits |
What trips Idaho applicants up
Idaho licenses electrical, plumbing, and HVAC contractors through DOPL with PSI exams. There is no NASCLA waiver—and many cities still require separate contractor registration for building work.
Verified sources: Idaho Division of Occupational and Professional Licenses · Idaho official licensing page.
Who needs an Idaho contractor license (and who does not)
Idaho DOPL licenses electrical, plumbing, and HVAC contractors statewide. Building GC rules are often city-specific on top of trade credentials.
| Electrical / plumbing / HVAC contractor | Covers: Statewide regulated trade contracting Authority: Idaho DOPL — PSI trade exams + application/background checks |
|---|---|
| Local building contractor registration | Covers: General building work where cities require contractor registration Authority: City/county AHJs — separate from DOPL trade licenses |
| Out-of-classification bidding | Covers: Bidding trade work without the matching DOPL license Authority: Prohibited — add the correct trade license before expanding scope |
Most-missed Idaho contractor exam topics
Snow-load, frost-protected foundations, and seismic bracing for MEP systems dominate Idaho misses.
- Frost-protected shallow foundation details and insulation R-values
- Snow-load calculations for 150–200 psf roof zones and drift conditions
- Seismic bracing for piping, conduit, and rooftop units
- DOPL application vs city registration mix-ups
- Reference editions in the current PSI bulletin for your trade
Trade-specific exam guides
If you're licensing in a single trade rather than the Idaho general contractor classification, the dedicated trade hub will get you to the right code book and exam structure faster.
- General contractor exam guide — IBC/IRC, NASCLA acceptance, and Business & Law.
- Electrical contractor exam guide — NEC (NFPA 70) calculations and grounding/bonding.
- Plumbing contractor exam guide — IPC/UPC drainage sizing, venting, and backflow.
- HVAC contractor exam guide — IMC ventilation, refrigerant management, and load calcs.
Idaho code books & approved references (2026)
Always confirm the exact editions and tab rules in your candidate bulletin before exam day. Editions can change between license cycles.
- 2023 National Electrical Code (with Idaho amendments)
- 2021 Uniform Plumbing Code
- 2021 International Mechanical Code
- 2021 International Fuel Gas Code
- Idaho Code Title 54 (Chapters 10, 19, 50)
- OSHA 29 CFR 1926
Fees & timeline for the Idaho contractor license
- Application fees vary by trade (typically $35–$50) plus background checks
- PSI exam fee (~$80 per attempt) due at scheduling
- Contractor license fee and biennial renewal fees per trade
- Bond and liability insurance premiums based on the required amounts
- Registration of Contractor fee through the Division of Building Safety for firms performing >$2,000 of work
Visit the All States hub to benchmark costs, then use DOPL’s fee schedule for the final numbers.
Idaho Business & Law focus
Idaho embeds business-law content into each trade exam, covering state licensing rules, permits, bonding, and safety.
- Know how to register as an Idaho contractor (Registration of Contractors Act) even if you hold a trade license
- Understand bond and insurance minimums and how to keep them on file
- Memorize permit, inspection, and correction notice timelines for each jurisdiction
- Review OSHA 1926 Subparts M, P, and K for safety questions
Practice with our Idaho trade & law simulator and the national Business & Law exam hub for cross-state baseline rules.
NASCLA acceptance in Idaho
Idaho does not accept NASCLA. Electricians, plumbers, and HVAC contractors must pass Idaho-specific PSI exams through DOPL, and many cities still require separate contractor registration for building work even after you hold a statewide trade license. Confirm the current candidate bulletin for your classification, then use timed state-specific practice instead of assuming an out-of-state NASCLA letter will transfer.
More: National NASCLA exam guide and our in-depth NASCLA Accredited Exam study walkthrough.
A focused 4-week study plan for the Idaho exam
Because Mountain counties demand ice-dam detailing and avalanche-resistant roofs, Boise Valley jobs battle expansive clays and heat, and eastern Idaho sits in high seismic risk, this four-week outline targets what Idaho field inspectors and your licensing board exam items actually test—not generic national prep.
- Week 1 — Map the exam. Pull your current candidate bulletin, list every reference, and confirm the modules you have to pass. Start a one-page error log. Spend extra time on: Frost-protected shallow foundation details and insulation R-values.
- Week 2 — Code book navigation. Drill open-book lookups (or memorisation drills if your module is closed-book) until you can find any answer in under 60 seconds. Anchor practice around: Snow-load calculations for 150–200 PSF roof zones and drift conditions.
- Week 3 — Business & Law. Idaho embeds business-law content into each trade exam, covering state licensing rules, permits, bonding, and safety. Layer in scenario-based questions on contracts, lien notice, payroll, and insurance.
- Week 4 — Full simulations. PSI test centers operate in Boise, Coeur d—Alene, Pocatello, Twin Falls, and Nampa with limited remote proctoring. Run two full-length timed simulations. Review every miss with a one-sentence rule statement.
FAQs - Idaho contractor exam
Who licenses contractors in Idaho?
Electrical, plumbing, and HVAC contractors are licensed by the Idaho Division of Occupational and Professional Licenses.
What exams are required?
Each trade contractor must pass both the journeyman exam (if not already licensed) and the contractor-level exam administered by PSI.
Does Idaho accept NASCLA?
No. Idaho relies on its own PSI exams.
How often do I renew?
Every two years, with proof of continuing education where required (e.g., electrical contractors need 24 hours per cycle).
What insurance or bonds do I need?
Electrical contractors need a $10,000 bond; HVAC and plumbing contractors need $2,000 bonds plus general liability and workers' compensation coverage.
What climate topics appear?
Expect frost depth, snow load, wildfire, and seismic detailing questions tied to Idaho’s varied climate.
Where do I test?
PSI centers in Boise, Coeur d—Alene, Pocatello, Twin Falls, and Nampa, plus limited online proctoring.
More Idaho contractor exam prep resources
Core resources
Exam-day reading
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