Idaho takes a two-tier approach to regulating contractors. Most private-sector residential and commercial contractors need only a registration with the Idaho Contractors Board, administered by the Division of Occupational and Professional Licenses (DOPL). There is no exam, no experience requirement, and no education prerequisite for this registration. The barrier to entry is low: proof of insurance, a $50 fee, and a completed application.

Contractors who bid on publicly funded projects worth $50,000 or more face a much higher bar. The Public Works Contractors License Board, also under DOPL, requires a formal license with verified financial statements, contractor references, relevant experience, and a proctored exam. License classes range from Class D (projects up to $50,000) through Class Unlimited (no cap), with net worth and working capital requirements that increase at each tier.

On top of these two programs, Idaho separately licenses specialty trades including electrical, plumbing, and HVAC through their own boards within DOPL. This guide covers everything you need to know about Idaho's contractor registration and public works licensing systems, with links to official sources so you can verify every detail.

Idaho Contractor Licensing Overview

Understanding Idaho's regulatory structure starts with recognizing the distinction between registration and licensure. These are not interchangeable terms in Idaho law.

Contractor Registration applies to anyone who performs construction work on private residential or commercial projects valued at more than $2,000 (combined materials and labor). Registration is governed by the Idaho Contractor Registration Act (Title 54, Chapter 52), which took effect January 1, 2006. It requires no exam, no documented experience, and no continuing education.

Public Works Contractor Licensing applies to contractors and subcontractors who bid on publicly funded construction projects with an estimated cost of $50,000 or more. This program is governed by Title 54, Chapter 19 of the Idaho Code and requires financial qualification, experience documentation, contractor references, and a proctored exam.

Both programs are administered by DOPL, but they operate under separate boards with separate applications, fees, and requirements. A public works license does not substitute for contractor registration, though holders of a public works license are exempt from the registration requirement under Idaho Code 54-5205.

Contractor Registration (Private Work)

The contractor registration program is Idaho's baseline regulatory layer. If you do any construction work exceeding $2,000 in total value and you are not otherwise exempt, you must register before starting work.

Who Must Register

Under Idaho Code 54-5204, any person who engages in the business of, or holds themselves out as, a contractor must be registered. This includes general contractors, remodelers, specialty contractors, and subcontractors working on private projects above the $2,000 threshold.

Exemptions from Registration

Under Idaho Code 54-5205, the following are exempt:

  • Licensed professionals — Holders of active public works contractor licenses, and individuals licensed as electricians, plumbers, HVAC installers, architects, engineers, or surveyors (when working within their licensed scope)
  • Employees — Salaried or wage-earning employees of a registered contractor
  • Owner-builders — Property owners performing work on their own land with no intent to sell within 12 months
  • Material suppliers — Suppliers who deliver but do not install or fabricate materials
  • Facility maintenance workers — Building owners maintaining their own commercial facilities with in-house crews
  • Volunteers — Persons performing work as part of a bona fide educational program, nonprofit charitable activity, or volunteer effort

Registration Requirements

There is no exam, no experience requirement, and no education prerequisite. To register, you must submit:

  • A completed registration application through the DOPL Online Services portal
  • Social Security Number or Federal Tax ID Number
  • Business name and address
  • Owner/principal information
  • Description of construction types you perform
  • Certificate of workers' compensation insurance (or proof of exemption)
  • Certificate of general liability insurance with a minimum of $300,000 single limit
  • Disclosure of any prior license denials or revocations in any state
  • $50 application fee

Display Requirements

Within 60 days of receiving your registration, you must prominently display your registration number at your place of business and on all job sites, advertising, contracts, building permits, letterheads, purchase orders, and subcontracts.

Public Works Contractor License

Any contractor or subcontractor who wants to bid on publicly funded construction, repair, or reconstruction projects with an estimated cost of $50,000 or more must hold a Public Works Contractor License. Private residential and commercial contractors do not need this license unless they intend to work on public projects.

The licensing program evaluates three core areas: financial capacity (net worth and working capital), experience (documented work history and contractor references), and knowledge (passing the state exam).

Application Requirements

  • Completed Public Works Contractor License application
  • Current financial statement (requirements vary by class — see below)
  • Three (3) contractor references
  • Detailed work history demonstrating experience in your requested license type
  • Federal Taxpayer ID Number
  • Appropriate examination form for your license class
  • Government-issued photo ID
  • Applicable license fee

All public works contractors must also register their business with the Idaho Secretary of State.

Public Works License Classes and Financial Requirements

Idaho issues eight classes of public works contractor licenses under Idaho Code 54-1904. The class determines the maximum dollar amount you can bid on a single public works project. Your class is determined by your company's net worth, working capital, and completed project history.

License Class Maximum Bid Amount Minimum Net Worth Minimum Working Capital
Unlimited No limit $1,000,000 $600,000
AAA $5,000,000 $600,000 $200,000
AA $3,000,000 $450,000 $150,000
A $1,250,000 $300,000 $100,000
B $600,000 $150,000 $50,000
CC $400,000 $75,000 $25,000
C $200,000 $25,000 Verify with DOPL
D $50,000 $10,000 $3,000

Financial Statement Requirements by Class

The type of financial statement you must submit depends on the license class you are applying for:

  • Class D and C: Multi-purpose balance sheet (no older than 6 months). QuickBooks-generated statements or CPA/LPA-prepared statements are accepted.
  • Class CC and B: Compiled financial statement prepared by a CPA or LPA, no older than 12 months. Must include the accountant's report.
  • Class A through Unlimited: Reviewed or audited financial statement prepared by a CPA or LPA, no older than 12 months. Must include the accountant's report.

Important: Subcontractor bids count toward the total project bid limit for all classes except Unlimited. If you hold a Class A license (max $1,250,000) and a subcontractor's portion is $500,000, that amount still falls within your total project cap.

Public Works License Types

In addition to a class, each public works license specifies a type that defines the scope of work the licensee is qualified to perform. Idaho recognizes four types:

  • Type 1 — Heavy Construction: Major infrastructure such as dams, water treatment facilities, bridges, and tunnels
  • Type 2 — Highway Construction: Roads, streets, highways, airport runways, and related earthwork
  • Type 3 — Building Construction: Commercial and public buildings, schools, hospitals, and similar structures
  • Type 4 — Specialty Construction: Specific trades performed as part of a public works project (e.g., electrical, plumbing, HVAC, masonry, structural steel, erosion control, asphalt grinding, hydrocutting, building moving, landscape maintenance, and others)

Applicants must provide detailed work history to demonstrate qualification for their requested type. Type 4 specialty contractors must declare all scopes of work they perform as part of bidding public works projects using the Type 4 Specialty License Declaration form.

Examination Requirements

The exam requirements differ between the two lowest classes and the upper classes.

Class D Exam

Class D applicants complete a take-home examination that is included with the application materials. This exam is administered directly by DOPL at no additional cost. A passing score of 70% or higher is required.

Classes C through Unlimited

Applicants for Class C and above must pass a proctored exam. The process works as follows:

  1. Complete the License Examination Information form (PWF-106a) and submit it with your application.
  2. Once your application is approved, DOPL will notify you via email to schedule your examination.
  3. Exams are administered at DOPL testing sites. Applicants can register through PSI's registration website.
  4. A passing score of 70% or higher is required.

Study Materials

The exam covers two primary reference sources:

DOPL also publishes a Public Works Exam Information Bulletin (updated December 2025) with detailed exam content outlines and testing procedures. Download it from the exams page.

Special accommodations for examinees with disabilities are available by request. Guidelines are posted on the DOPL exams page.

License Fees and Costs

Contractor Registration Fees (Private Work)

Fee Type Amount
Initial Application (Business or Individual) $50
Annual Renewal $50
Late Renewal Penalty $35 (in addition to renewal fee)
Duplicate Registration $10

Note: As of October 14, 2025, the Contractors Board is transitioning to biennial (2-year) registration. Once you renew under the extended cycle, the registration fee will double to $100 to cover both years. The transition is staggered by birth year — odd-year births moved to biennial in 2025, even-year births in 2026. Check the DOPL Contractors Board News page for details on how your renewal cycle is affected.

Public Works Contractor License Fees

License Class Initial License Fee Statutory Maximum Fee
Unlimited $440 $600
AAA $360 $500
AA $280 $400
A $200 $300
B $120 $200
CC $100 $150
C $80 $100
Construction Manager $160 $200
Certificate of Authority $100 —

Fee Holiday (2026): As of January 1, 2026, DOPL is waiving renewal fees for all Public Works Contractors and Construction Manager licenses. If you renew on or after this date, you will not pay a renewal fee. This fee holiday applies for the entire renewal period through 2028 or 2029 depending on your cycle. The Public Works Board is also transitioning to biennial licensure beginning April 1, 2026. Once you move to a 2-year renewal cycle, your license fee will double to cover both years. See the DOPL fee changes announcement for specifics.

Exam Fees

  • Class D exam: No additional fee (included with application)
  • Classes C through Unlimited (proctored exam): Verify current exam fee with PSI or DOPL, as fees are set by the exam provider

Insurance and Bond Requirements

Contractor Registration (Private Work)

All registered contractors must maintain:

  • General liability insurance: Minimum $300,000 single limit. A certificate of insurance must be submitted with the registration application.
  • Workers' compensation insurance: Required unless the contractor qualifies for an exemption (e.g., sole proprietor with no employees). Proof must be submitted with the application.

There is no surety bond requirement for general contractor registration in Idaho.

Public Works Contractor License

The Public Works Contractors License Board does not impose a separate insurance or bond requirement at the state licensing level. However, individual public works contracts and government agencies may require performance bonds, payment bonds, and project-specific insurance as conditions of the contract. These requirements are set by the contracting entity, not the licensing board.

Specialty Trade Bonds

Certain specialty trades licensed through DOPL do require surety bonds:

  • Plumbing contractors: $2,000 surety bond
  • HVAC contractors: $2,000 surety bond
  • Fire protection sprinkler contractors: $2,000 surety bond

Some municipalities impose additional bonding requirements. For example, the City of Idaho Falls requires a $5,000 bond for right-of-way contractors.

License Renewal

Contractor Registration Renewal

Initial registrations are valid for 12 months after the registrant's next birthday. Renewal is then required annually (transitioning to biennially as described above).

  • Renewal fee: $50 annually ($100 biennial once transitioned)
  • Late renewal penalty: $35 in addition to the renewal fee
  • Continuing education: None required for general contractor registration
  • Renewal portal: DOPL Online Services

Public Works License Renewal

Public works licenses renew annually on the anniversary of the original issue date, transitioning to biennial starting April 1, 2026.

  • Renewal fee: Same as initial license fee for each class (currently waived during 2026 fee holiday)
  • Continuing education: None required for public works contractor licensing
  • Financial statements: An updated financial statement must be submitted with each renewal to verify continued qualification for your license class
  • Renewal portal: DOPL Public Works Licensing page

Specialty Trade Licenses

Idaho separately licenses several specialty trades through dedicated boards within DOPL. These licenses are in addition to contractor registration (though holding one of these licenses exempts you from the general registration requirement when working within your licensed scope).

Electrical

The Idaho Electrical Board licenses electricians at several levels (apprentice, journeyman, master). Electrical contractors must employ at least one licensed master electrician. Requirements include passing an exam, providing proof of experience, and maintaining general liability and workers' compensation insurance. Journeyman and master electricians must complete 24 hours of continuing education every three years (8 hours of Code Update plus 16 hours of Code Update, Code Related, or Industry Related courses).

Plumbing

The Idaho State Plumbing Board licenses plumbers at the apprentice, journeyman, and master levels. Plumbing contractors must employ at least one licensed journeyman plumber, pass an exam, demonstrate experience, and maintain a $2,000 surety bond.

HVAC

The HVAC Board licenses HVAC and mechanical contractors. HVAC contractors must employ at least one licensed journeyman technician, pass an exam, verify experience, and maintain a $2,000 surety bond.

For full requirements on any specialty trade, visit dopl.idaho.gov and select the relevant board.

Reciprocity with Other States

Contractor Registration

Idaho does not offer reciprocity for general contractor registration. All contractors working on private projects in Idaho must register directly with the Idaho Contractors Board, regardless of licenses held in other states.

Public Works Contractor License

Idaho does maintain reciprocal agreements with certain states for public works contractor licensing. The specific states and terms of these agreements are listed in an official Reciprocal Information document maintained by the Public Works Contractors License Board. Contact DOPL at publicworks@dopl.idaho.gov or (208) 334-3233 for the current list of reciprocal states and what requirements may be waived.

Specialty Trade Reciprocity

Idaho reciprocates certain electrical and plumbing licenses from other states, provided the out-of-state license holder meets Idaho's requirements. The specifics vary by trade. The DOPL Reciprocal Information document lists which states and license types qualify.

NASCLA

Idaho references NASCLA (National Association of State Contractors Licensing Agencies) exams in connection with public works contractor licensing. PSI administers the applicable NASCLA examinations for Idaho applicants. Check the DOPL Public Works Exams page for current exam details and whether a NASCLA accredited exam may satisfy Idaho's requirements.

How to Verify a Contractor's Registration or License

Idaho provides free online tools to verify any contractor's registration or license status:

  • DOPL License Search: dopl.idaho.gov/license-search/ — Search by name, license number, or business name to verify any DOPL-issued registration or license, including contractor registrations, public works licenses, and specialty trade licenses.
  • DOPL Online Services: edopl.idaho.gov/OnlineServices/ — Additional search functionality and registration verification.

When verifying a contractor, confirm:

  • Registration or license status is active (not expired, suspended, or revoked)
  • The license type and class match the work being performed
  • The business name matches the entity you are contracting with
  • For specialty trades, verify the appropriate trade license is current (electrician, plumber, HVAC, etc.)

DOPL also maintains public records of formal enforcement actions against both registered and unregistered contractors.

Penalties for Working Without Registration or a License

Contractor Registration Violations

Under Idaho Code 54-5217, operating as a contractor without current registration is a misdemeanor. Penalties upon conviction include:

  • Fine of up to $1,000
  • Imprisonment in the county jail for up to six (6) months
  • Both fine and imprisonment at the court's discretion

Beyond criminal penalties, unregistered contractors face severe civil consequences:

  • No right to sue for payment: An unregistered contractor cannot bring or maintain any legal action to collect compensation for work performed. Even if the property owner refuses to pay, you have no standing in court unless you can prove you were registered during the entire period of performance.
  • No mechanic's lien rights: Unregistered contractors forfeit the right to place a lien on the property where work was performed.
  • No building permits: Building departments can refuse to issue permits to unregistered contractors.
  • No contract enforcement: Contracts entered into by unregistered contractors may be unenforceable.

Public Works Violations

Performing public works contracting without the required license is also a violation of Idaho law under Title 54, Chapter 19. Public entities are prohibited from awarding contracts to unlicensed contractors, and any contract awarded to an unlicensed contractor may be voided.

Frequently Asked Questions

Do I need a license or a registration to do contracting work in Idaho?

For private residential and commercial work over $2,000, you need a registration with the Idaho Contractors Board. For publicly funded projects estimated at $50,000 or more, you need a Public Works Contractor License. If you do electrical, plumbing, or HVAC work, you need a separate trade license regardless of project type.

Is there an exam for contractor registration?

No. Idaho's general contractor registration requires no exam, no experience, and no continuing education. You need proof of insurance, a $50 fee, and a completed application.

Can I do my own home renovations without registering?

Yes. Under the owner-builder exemption in Idaho Code 54-5205, property owners performing work on their own land are exempt, provided they do not intend to sell the property within 12 months of completing the work.

What happens if I work without a registration?

You face misdemeanor criminal charges (up to $1,000 fine and 6 months in jail), lose the right to sue for payment, lose mechanic's lien rights, and cannot obtain building permits. The financial risk far outweighs the $50 registration fee.

How long does it take to get a public works contractor license?

Processing time depends on the completeness of your application and your license class. Class D applications include a take-home exam and can be processed relatively quickly. For Classes C through Unlimited, you must wait for application approval before scheduling a proctored exam. Contact DOPL at (208) 334-3233 for current processing timeframes.

Does Idaho require continuing education for contractors?

No continuing education is required for general contractor registration or public works contractor licensing. However, specialty trade licenses (electrical, plumbing, HVAC) do require continuing education. For example, journeyman and master electricians must complete 24 hours of CE every three years.

Board Contact Information

Idaho Contractors Board (Registration)

Public Works Contractors License Board

Division of Occupational and Professional Licenses (DOPL)

  • Website: dopl.idaho.gov
  • Main Email: dopl@dopl.idaho.gov
  • Phone: (208) 334-3233
  • Mailing Address: 550 W. State Street, Boise, ID 83702
  • Headquarters (Physical): 11341 W. Chinden Blvd., Boise, ID 83714
  • Office Hours: 8:00 AM – 5:00 PM, Monday – Friday (except state holidays)
  • Best calling hours: 9:30 AM – 2:00 PM weekdays
  • Online Services: edopl.idaho.gov/OnlineServices/