Colorado Contractor License Requirements

01 The Colorado model

Colorado is not California, Florida, Arizona, Texas, Georgia or Nevada: the state never issued a general contractor license. It licenses two trades and leaves everything else to local government:

• No statewide general contractor license — verified absence — enumerated from the DPO program pages: the Division's only construction professions are Plumbing and Electrical. General building, remodeling, roofing, mechanical/HVAC, concrete, carpentry and painting are licensed locally, and Colorado's counties confirm it (Larimer marks only Plumbing/Electrical "Exempt*"; Jefferson County: "does not license State-Licensed Plumbers or Electricians"). (Rule CO-NO-STATEWIDE-GC.) S-CO-DPO-HOME
• Plumbing — license to work, registration to operate — C.R.S. §12-155-108(1) (verbatim): a person "shall not engage in or work at the business, trade, or calling of a residential, journeyworker, or master plumber in this state until the person has received a license from the division…"; §12-155-108(3) registers the business on fee + workers' compensation + unemployment compensation evidence + a full-time master plumber in charge. (Rule CO-PLUMBING-CONTRACTOR.) S-CO-12-155-108
• Electrical — same architecture, NEC-aligned — C.R.S. §12-115-109(1) (verbatim): "No person shall engage in or work at the business, trade, or calling of a journeyman electrician, master electrician, or residential wireman in this state until the person has received a license from the division…"; the Electrical Contractor registration needs a licensed master as responsible individual, one company only. (Rule CO-ELECTRICAL-CONTRACTOR.) S-CO-12-115-109
• No dollar threshold anywhere — neither Article 155 nor Article 115 contains a contract-price trigger; requirements are experience-HOURS (RP 3,400 h; JW 6,800 h plumbing / 8,000 h electrical; MP 8,500 h). Local $15k/$20k figures are experience-verification rules, not state triggers. (Rule CO-NO-STATEWIDE-GC.) S-CO-12-155-108
• LOCATION decides the rest — the state inspects only where no local program exists; in listed counties the local building department owns permits and inspection, and may require its own license. DPO (verbatim): "You are responsible for determining the correct inspection authority." (Rule CO-INSPECTION-AUTHORITY.) S-CO-DPO-PERMIT-INFO

02 Who regulates

DORA's Division of Professions and Occupations houses BOTH construction boards — the Colorado State Plumbing Board (created by C.R.S. §12-155-104, established 1917) and the Colorado State Electrical Board (C.R.S. §12-115-104, established 1959, NEC adopted 1965) — at 1560 Broadway, Denver. CDLE administers workers' compensation and unemployment insurance; the Secretary of State hosts both official rule sets; the General Assembly publishes C.R.S. (this environment gets HTTP 403 from the official host — statutory text was read on FindLaw's mirror, a published limitation); and Denver, Aurora, Colorado Springs/PPRBD, Fort Collins, Larimer County and Jefferson County document the local layer. All are official sources here.

03 State vs local

Colorado's boundary is not Nevada's "state + locals may add" nor Georgia's preemption: the state simply does not license general construction at all. The statutes build the split in themselves:

04 Credential model

Colorado issues 7 credential shapes across exactly two state-regulated trades. The split matters: a personal license lets you work at the trade; a registration lets a business operate it (or an employer register an apprentice). There is no generic "general contractor" credential of any kind:

• License to work, registration to operate — personal licenses: Residential / Journeyworker / Master Plumber (RP / JW / MP) and Residential Wireman / Journeyman / Master Electrician (RW / JW / ME); registrations: plumbing contractor, electrical contractor, water conditioning contractor + installer/principal, photovoltaic installer and the apprentice registration. (Rules CO-PLUMBING-LICENSE, CO-ELECTRICAL-LICENSE, CO-PLUMBING-CONTRACTOR, CO-ELECTRICAL-CONTRACTOR.) S-CO-12-155-108 S-CO-12-115-109
• One firm, one master — a plumbing contractor registration requires a full-time master plumber in charge (§12-155-108(3)); the Electrical Contractor registration requires a licensed master as the responsible individual, one company only — a master cannot anchor two firms. (Rule CO-MASTER-ONE-FIRM.) S-CO-12-155-108 S-CO-ELEC-APPS
• The apprentice registration belongs to the employer — "within thirty days after the date of initial employment, be registered with the board" and "The employer of a plumbing apprentice shall be responsible for the apprentice's registration" (§12-155-108(2) verbatim). (Rule CO-PLUMBING-LICENSE.) S-CO-12-155-108
• Water conditioning and photovoltaics are registrations too — water conditioning contractor/installer-principal (Art. 155) and the new photovoltaic installer registration (SB25-165, registration deadline 2026-12-31) ride on the same two boards — never a separate statewide profession. S-CO-ELEC-APPS
• No state GC credential exists — nothing in the credential surface authorizes general building, remodeling, roofing, mechanical or painting work statewide; those are local credentials only (section 07). S-CO-DPO-HOME

05 Classifications

These 13 rows are the complete STATE credential surface — every official classification the two DPO boards issue, each mapped to the credential that carries it. Local classes (Denver A/B/C/D, Aurora types, Fort Collins A–MM, Larimer A/B/C, JeffCo, PPRBD) are deliberately NOT seeded as state rows — they are published as the labeled local layer below:

Full classification scopes, conditions and rules →

06 Exemptions and verified absences

Colorado's exemptions are few because there is little to exempt: the state never licensed general construction in the first place. One statutory exemption (homeowner), one employee rule, and three verified absences — none combined into a generic "minor work" loophole:

• Homeowner may self-perform — on the own home only — DPO verbatim: a homeowner may do their own wiring/plumbing if the work is personally performed and the property is "not for sale, resale, or rent and is not generally open to the public", all work is inspected before covering and again on completion, and it complies with the NEC / adopted plumbing code — AND a permit is obtained BEFORE starting. The homeowner is a "qualified applicant" for the permit (§12-155-120(11)(c)). (Rule CO-HOMEOWNER-WORK.) S-CO-DPO-PERMIT-INFO
• Hiring warning that comes with it — DPO verbatim: "it is a violation of state law for an individual (other than the homeowner) that is not a registered Electrical or Plumbing Contractor to install an electrical or plumbing project on your property." S-CO-DPO-PERMIT-INFO
• Employees work under the business's credential — and a licensed master who is not a registered plumbing contractor "shall not apply for a permit" when operating independently (§12-155-120(1)(c)(II)(A) verbatim). Subcontracted state-trade work must be done by a registered contractor. (Rule CO-LOCAL-LICENSE.) S-CO-12-155-120
• Local homeowner variants stay local — Denver owner-occupier exams are free/open-book (no exam for general residential construction incl. roofing); Jefferson County: one residential permit per 24-month period or you are deemed a contractor; Fort Collins owner exemption with conditions — each on its own local row, never merged with the state rule.

07 Local layer (six jurisdictions)

LOCAL EXAMPLES — NOT STATEWIDE. Six regimes were researched from official pages; they do not generalize. General construction licensing lives entirely below the line, and the local treatment of the two STATE trades differs per jurisdiction — exempt in Aurora/Larimer/JeffCo, an extra PPRBD license in the Springs region, a Denver license PLUS the state card:

08 Bonds

Colorado is a deliberately EMPTY bond table — zero bond_requirement rows, because neither Article 155 nor Article 115 conditions a state credential on a surety bond — a verified absence, not a gap:

• No statewide plumbing or electrical bond — registration needs fee + workers' compensation + unemployment evidence + the master in charge, nothing more (§12-155-108(3); the electrical conditions parallel it). (Rule CO-NO-STATEWIDE-BOND.) S-CO-12-155-108
• Two verified LOCAL bond examples — named, never generalized — Aurora right-of-way contractors: $20,000 irrevocable license & permit bond (min 2 years) + $1,000,000 GL each occurrence; Colorado Springs Concrete Contractor: $5,000 surety bond + $1,000,000 GL with the city as holder. Both live on their local rows (section 07), not here.
• Other local bonds — some Colorado cities or counties may require a bond as part of local permitting or registration; never researched to a verifiable amount, so none is published — LOCAL_AUTHORITY_REQUIRED.

09 Insurance and financial responsibility

Colorado's registration conditions are workers' compensation and unemployment evidence ONLY — no statewide general-liability figure exists. The GL row below is published as an absence with a conflict attached, never as a requirement:

CDLE verbatim: 'All businesses with employees operating in Colorado are required to have workers' compensation insurance, regardless of the number of employees, whether the employees only work part-time, or if they are members of the same family.' DWC employers page verbatim: 'If you have one or more employees working for you in Colorado, you must have workers' compensation insurance and maintain it at all times.' This is also the statutory precondition of BOTH state contractor registrations (§12-155-108(3); DPO electrical conditions — the PC application preview asks for a 'Worker's Compensation Certificate of Liability' upload before submission). S-CO-CDLE-WC

C.R.S. §12-155-108(3) verbatim: the board registers a plumbing contractor upon fee payment and 'presentation of evidence that the applicant has complied with the applicable workers' compensation and unemployment compensation laws of this state.' DPO Electrical Applications verbatim: 'Must submit evidence of compliance with Workers' Compensation and Unemployment Compensation laws.' The official PC application preview requires unemployment insurance company/ID fields before the form can be submitted. The UC program is administered by CDLE's Division of Unemployment Insurance (named by the Electrical Licensing Guide). S-CO-12-155-108

No statewide GL figure — verified absence: The statutory/registration conditions require ONLY workers' compensation and unemployment compensation evidence (§12-155-108(3); DPO electrical conditions; the official PC application preview asks for WC + UC and nothing else), and NO GL/PD provision appears anywhere in 3 CCR 720-1 — verified absence of a statewide GL requirement for state registrations. CONFLICT-CO-002 (OPEN): the official DPO Plumbing Licensing Guide states plumbing business owners must carry 'Property Damage Insurance (minimum $100,000)' and 'General Liability Coverage (minimum $300,000)' — irreconcilable with the statute, the preview and the rules. The $100k/$300k figures are published as the conflicting claim and WITHHELD from deterministic logic; WC/UC is the encoded requirement. Electrical contractor registration: no GL condition at all (verified absence from the DPO conditions). S-CO-12-155-108

10 Renewal and continuing education

Two families, two cadences: the plumbing family expires on the final day of February of odd-numbered years (encoded as a 24-month cycle) with the statutory 3-year transition beginning 2027-03-01 — and CONFLICT-CO-001 beside it; the electrical family renews every three years on September 30, deliberately tied to the Board's NEC adoption. Both boards share a 60-day grace window, then ineligibility until reinstated:

DPO Applications verbatim: 'All Plumbing Licenses, Water Conditioning Installer/Principal Registrations, Plumbing Contractor Registrations and Water Conditioning Contractor Registrations expire on the final day of February of odd-numbered years and must be renewed to continue practicing. … renewals open approximately 4-5 weeks prior to the expiration date.' 120-day bump: 'All new applicants who are issued a license within 120 days of the upcoming renewal expiration date will be issued a license with the next expiration date.' Statutory transition C.R.S. §12-155-112(1)(a) verbatim: 'Beginning with the plumbing license cycle that begins on March 1, 2027, and each subsequent license cycle thereafter, the board shall issue and renew plumbing licenses for a period of three years unless otherwise determined by the director.' CONFLICT-CO-001 (OPEN): the official Plumbing Licensing Guide says flatly 'All Colorado plumbing licenses expire every three years … renew up to six weeks before the expiration date' — preserved beside the Applications-page wording; the current odd-year-February cycle is what deterministic logic encodes. S-CO-PLUMB-APPS

3 CCR 710-1 Rule 1.13(A) verbatim: 'Board issued licenses, photovoltaic installers and electrical contractor registrations shall be renewed every three years to correspond with the Board's adoption of the National Electrical Code.' DPO Electrical page: expiration September 30 every 3 years (renewal window published on the page, e.g. open through 11/30/2026 as published). S-CO-CCR-710-1

Plumbing CE: C.R.S. §12-155-112(3)(a) verbatim: 'the board shall not renew or reinstate a license unless the applicant has completed eight hours of continuing education for every twelve months that have passed after the later of the last date of renewal or reinstatement. This subsection does not apply to the first renewal or reinstatement of a license for which, as a condition of issuance, the applicant successfully completed a licensing examination.' 3 CCR 720-1 Rule 1.4(E)(3): per 12-month period from core competencies — 'within every twenty-four month period, a minimum of 4 continuing education hours must be related to codes … and a maximum of 2 hours can be related to safety training' — plus attestation that the licensee 'has read the current Colorado Plumbing Code.' Inactive licensees and water-conditioning installers/principals are exempt. S-CO-12-155-112

Electrical CE: 3 CCR 710-1 Rule 1.13(C)(4) verbatim: 'a licensee in active status shall complete twenty-four hours of continuing education in order to renew a license … a minimum of four continuing education hours must be related to National Electrical Code changes. No more than four hours will be credited in safety courses.' Credits apply to one 3-year renewal period; inactive licensees are exempt; a holder of multiple licenses satisfies the requirement with the most advanced license. Statutory basis §12-115-110 (cited by Rule 1.13(C)(1)). S-CO-CCR-710-1

Plumbing reinstatement: Expired >60 days but <2 years: 3 CCR 720-1 Rule 1.4(E)(2)(a) — renewal-in-lieu (reinstatement application + current reinstatement fee) plus 'evidence of completion … of eight hours of continuing education' since the most recent licensing event. Expired ≥2 years: C.R.S. §12-155-112(2)(b) verbatim — demonstrate competency by '(I) Providing verification of a license in good standing from another state and proof of active practice … for the year previous; (II) Satisfactorily passing the state plumbing examination …; or (III) Any other means approved by the board.' Water conditioning installers/principals are exempt from the 2-year rule (3 CCR 720-1). The official guide states the narrower 'full licensing examination BEFORE applying for reinstatement' — the statute's alternatives govern; the guide is recorded beside it (research quality gate, NOT seeded as a conflict). S-CO-12-155-112

Electrical reinstatement: Expired >60 days <2 years: attestation of 24 hours CE since the most recent licensing event (Electrical Licensing Guide + 3 CCR 710-1 Rule 1.13(B)(1)). Expired ≥2 years, one of (guide, official): pass the full written exam since expiry; OR verification of an active equivalent out-of-state license + attest 24 h CE; OR (Journeyman only) an active Journeyman license from a NERA reciprocal-state participant (Rule 1.13(B)(2) mirrors this via §12-20-202(2)(c)(II)(C) pathway as published). Inactive status: no practice, no CE; reactivation from inactive within 3 years requires 24 hours CE. S-CO-ELEC-GUIDE

11 State fees

The 7 verified whole-dollar PLUMBING licensing fees — the official DPO guide's table (apprentice registration + the RP/JW/MP application and renewal ladder). Every other state figure is deliberately withheld:

C.R.S. §12-155-105(1)(d): the board acts through the division and fees are set by the director of the division under C.R.S. §12-20-105 — no dollar schedule for those fees is published on any page read. WITHHELD ON PURPOSE (each named, never guessed): all state ELECTRICAL license fee amounts (application/renewal/reinstatement — surfaced only inside the DPO Online Services flow); plumbing contractor / water conditioning REGISTRATION fees; plumbing reinstatement, delinquency and reactivation fee amounts; PSI exam and re-exam fees; state permit fee amounts (the double-fee RULE is verified, the amounts are not); PPRBD license fees (site unreachable); Aurora renewal term; Denver and Jefferson County insurance/bond amounts. S-CO-12-155-105

Withheld on purpose (never guessed): every ELECTRICAL state fee (license, renewal, registration — no figure is published outside the DPO Online Services flow), PSI exam and re-exam fees, the reinstatement and delinquency fee amounts (both boards' rules delegate them without publishing a number), all state permit fee amounts (priced in the online system — fixture count for residential plumbing, valuation for commercial), and every local fee (Denver's $250/$160 table, Aurora Form A105, Fort Collins $300/$225, Larimer $150/$125/$100, JeffCo $50, Colorado Springs $110 — published on their local rows and the fees page, never as state fees).

Full fees page →

12 Exams and experience

13 Permits and inspection authority

In Colorado a permit is per JOB and a credential is per WHO — two separate systems everywhere. And the pivotal step: the job-site county decides whether the state or the local building department inspects:

• Permit BEFORE work — starting early costs double — DPO verbatim: "A valid Colorado State Electrical permit must be obtained prior to installing electrical wiring" / "A valid Colorado State Plumbing permit must be obtained prior to installing plumbing"; both rule sets: "Any work commencing prior to the purchase of a permit is subject to twice the prescribed permit fee." State permits are valid 12 months with one 6-month extension. (Rule CO-PERMIT-BEFORE-WORK.) S-CO-DPO-PERMITS
• Who may pull it — a "qualified applicant" — C.R.S. §12-155-120(11): a licensed master who is also a registered plumbing contractor (incl. sole proprietor), a licensed master directly employed by a registered contractor, or the homeowner on the homeowner's own home. A master operating independently WITHOUT a registration is barred from applying. Electrical/photovoltaic permits: homeowner, electrical contractor or photovoltaic installer. S-CO-12-155-120
• State vs local inspection flips by job-site county — DPO verbatim: "The State does not inspect in local jurisdictions having its own Electrical Inspection Program. You are responsible for determining the correct inspection authority." Applicants in listed counties are told: "If the county where your job site is located is listed below, do not continue with the permit application process…" State plumbing inspectors cover the 27 counties where no local program exists. (Rule CO-INSPECTION-AUTHORITY.) S-CO-DPO-PERMIT-INFO
• Local programs run their own permits AND inspections — Denver, Aurora, the PPRBD region (Colorado Springs), Jefferson County, Larimer and others in the DPO lists; the local license question is separate again (section 07).

14 Solar and photovoltaics

Solar in Colorado runs through the ELECTRICAL credential plus one brand-new registration (SB25-165) — three provisions, each sourced:

• Photovoltaic installer registration (new) — DPO verbatim: 'Senate Bill 25-165 requires Photovoltaic Installers to register with the State Electrical Board no later than December 31, 2026.' Requirements (same page): employ at least one NABCEP Certified employee; designate agent(s) — 'the registration is invalidated if the agent leaves'; be in good standing with the State and registered with the Colorado Secretary of State; qualify by 'performing PV work on or before September 1, 2025.' Applications become available late 2026. 3 CCR 710-1 Rule 1.13(A) confirms photovoltaic-installer registrations renew every three years with board licenses. (Rule CO-PV-INSTALLER-REG.) S-CO-ELEC-APPS
• The 300 kW line — C.R.S. §12-115-107(2)(f) verbatim: 'On and after January 1, 2020, all photovoltaic electrical work for installations of at least three hundred kilowatts, including the interconnection of the modules, grounding of the modules, any balance of system wiring, and the customer-side point of connection to the utility grid, must be performed by a licensed master electrician, licensed journeyman electrician, licensed residential wireman, or properly supervised electrical apprentices and must comply with all applicable requirements of this article 115…' S-CO-12-115-107
• EV / solar-ready permit condition — C.R.S. §12-115-107(3)(a): for electrical permits on new construction or major renovations of multifamily buildings, applicants must comply with the model electric-ready and solar-ready code (EV power-transfer-infrastructure requirements); enforcement since March 1, 2024. §12-115-107(3)(b): local building and zoning provisions yield to these rules. S-CO-12-115-107
• Who installs the system otherwise — the electrical contractor registration + a licensed master (or a photovoltaic installer registration for PV) — the same one-firm-one-master architecture as every other state trade. S-CO-ELEC-APPS

Solar installation project page →

15 Official lookup

Before hiring — or before claiming your own credential status — check the official lookups. They are linked, not mirrored, so the status vocabulary is whatever the agency publishes:

• DORA — Division of Professions and Occupations (DPO), Colorado State Plumbing Board, Colorado State Electrical Board — https://apps2.colorado.gov/dora/licensing/Lookup/LicenseLookup.aspx S-CO-DPO-HOME
• City and County of Denver — Community Planning & Development (Contractor Licensing) — https://www.denvergov.org/Government/Agencies-Departments-Offices/Agencies-Departments-Offices-Directory/Community-Planning-and-Development/Contractor-Licensing/Contractor-License-Search/ S-CO-DENVER-LANDING
• Jefferson County (unincorporated) — Building Division — https://www.jeffco.us/2207/Documents S-CO-DPO-HOME

The DORA license lookup covers every DPO credential (plumbing, electrical, water conditioning, photovoltaic installer, both contractor registrations); Denver publishes its own Contractor License Search for local classes. Local lookups for Aurora (Contractor Lookup on its licensing page), Fort Collins, Larimer, JeffCo and the PPRBD region are named with their local rows in section 07 — verification for a local credential must run in that jurisdiction's own tool.

16 Project examples

Every project page runs the deterministic rule first: missing facts return NOT_DETERMINED, never a forced answer. Five pages are deliberately absent (policy "absent", not missing): exemptions and permit-fees and exam-requirements (one statute, one online system and code-exam-only respectively — would be template filler), local-licensing (a LOCATION question with six researched answers already on this page), and home-addition (fully decided by the state/local split + permits — no rule to run).

17 Scope assertions

Scope is recorded as typed assertions — officially included, officially excluded, requires another classification, not determined, or our interpretation (always marked). There is no boolean "covers":

• Officially included colorado:master-plumber — Plumbing Within The Building Or Five Feet From The Foundation (C.R.S. §12-155-103(8)(a)–(b)) S-CO-12-155-103
  The trade-field definition: what counts as 'plumbing' statewide, with the five-feet boundary and the three official exclusions — the same boundary every plumbing credential works inside (research §E).
• Officially included colorado:master-plumber — Planning Laying Out Installing Repairing And Supervising Plumbing Apparatus (C.R.S. §12-155-103(4)) S-CO-12-155-103
  The full-scope plumbing credential: the only one that can BE the plumbing contractor's master-in-charge and the only registered master who may pull a state permit as a sole proprietor (SCOPE-CO-PULL-PERMIT).
• Officially included colorado:residential-plumber — Plumbing In One To Four Family Dwellings Up To Two Stories (C.R.S. §12-155-103(13)) S-CO-12-155-103
  The RP boundary is statutory — the two limits (4 families / 2 stories) are the license's own words, so the answer for a 5-family building or a 3-story building is the credential ladder, not interpretation (research §D/§E).
• Officially included colorado:plumbing-contractor — Undertaking Planning Laying Out Supervising Installing Or Repairing Plumbing For Others (C.R.S. §12-155-103(10) / §12-155-108(3)) S-CO-12-155-103
  THE business-side scope: doing plumbing FOR ANOTHER (for compensation) is registration work — 'undertakes OR OFFERS TO UNDERTAKE' covers bids too. Homeowner self-performance on own property is outside it (REQ-CO-HOMEOWNER-001) (research §C/§E).
• Officially included colorado:master-electrician — Planning Laying Out Installing And Repairing Wiring For Light Heat And Power Per Current Nec (C.R.S. §12-115-107(2)(a)(I)) S-CO-12-115-107
  The electrical trade field as the board defines it — new work, additions, alterations AND repairs, all against the current NEC. Attached to ME as the highest license; the same standards sentence governs all three licenses (research §E).
• Officially excluded colorado:residential-wireman — Electrical Work Beyond The Authorization Of The License Held (C.R.S. §12-115-109(2)) S-CO-12-115-109
  An official statutory exclusion (the license's own limit), not our reading — the RW answer to any work 'beyond the authorization' is a negative (research §E).
• Officially included colorado:master-plumber — State Or Local Plumbing Permit As Qualified Applicant (C.R.S. §12-155-120(11) / §12-155-120(1)(c)(II)(A)) S-CO-12-155-120
  Permit power is the NARROWER gate: a master license alone does not unlock a permit — registration (or direct employment by a registered contractor) does, and the homeowner qualifies for their own home. Electrical/photovoltaic state permits may instead be obtained by a homeowner, an electrical contractor or a photovoltaic installer (DPO permit information) (research §C/§E).

18 Sources

Every source used on this page: official URL, publishing authority, retrieval date and verification date. Commercial contractor sites, SEO directories and law-firm marketing pages were discovery leads only and are never cited as authority. Statute text was read on FindLaw's mirror linking the official leg.colorado.gov anchors (the official host returns HTTP 403 to this environment — a published limitation), both board rule sets as official SOS PDFs (GenerateRulePdf.do), and the two official DPO guides on Google Drive (the files DPO itself links). PPRBD was unreachable all research day and is recorded as such.

19 Last verified

20 Known conflicts and limitations