Water Heater Replacement — Colorado license requirements

01 The project

The starting point is the work itself — Water Heater Replacement in Colorado. The job determines which trades are involved, and the trades determine which license classifications may be required.

No project components are seeded for this project — we do not invent component lists without evidence.

02 Jurisdiction

This project is evaluated for Colorado — the two-layer state with no statewide general contractor license at all (a verified absence, not a gap). The state regulates exactly two trades, plumbing (C.R.S. Art. 155) and electrical (Art. 115), through DORA's Division of Professions and Occupations; general construction licensing is entirely local with six researched regimes, and the permit / inspection authority flips state ↔ local by job-site county. There is no statewide dollar threshold, bond or general-liability figure — each a verified absence — and registration conditions are workers' compensation + unemployment evidence only. Colorado jurisdiction page.

03 Trade → license

Relations below are recorded per state — only this jurisdiction's classifications are shown.

Trades involved: no seeded components — trade resolution follows from the classification relations below.

• May require RESIDENTIAL-PLUMBER — Residential Plumber (RP) confirmed S-CO-12-155-103 rule CO-PLUMBING-LICENSE
  Individual-license limb for the typical case: a replacement in a 1–4 family dwelling ≤2 stories is within the Residential Plumber's statutory scope (§12-155-103(13)) — larger buildings need Journeyworker/Master. Permit must be bought BEFORE the work starts (double fee otherwise); homeowner may do their own with permit + the four DPO conditions (rule CO-HOMEOWNER-WORK).
• May require PLUMBING-CONTRACTOR — Plumbing Contractor (business registration) confirmed S-CO-12-155-108 rule CO-PLUMBING-CONTRACTOR
  Water heaters are plumbing work under the adopted IPC — and the state permit system prices residential permits BY FIXTURE COUNT with water heaters listed explicitly (DPO). A hired replacement needs the registered plumbing contractor; gas venting/connection ties to the Colorado plumbing/fuel-gas codes (IFGC is a state exam subject). Local permit authority or state permit depending on county (research §N.5).

04 Scope

What the official sources say about the work involved — typed assertions, never a boolean "covers". Interpretations are marked as such.

• Officially included RESIDENTIAL-PLUMBER Plumbing In One To Four Family Dwellings Up To Two Stories (may_perform) 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 PLUMBING-CONTRACTOR Undertaking Planning Laying Out Supervising Installing Or Repairing Plumbing For Others (may_perform) 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).

05 Requirements

06 Rule: CO-PLUMBING-LICENSE

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…'. The trigger is the WORK TYPE with NO dollar threshold; the homeowner self-performance path (own property, permit first, four DPO conditions) is a separate outcome via rule CO-HOMEOWNER-WORK's conditions. Missing facts yield NOT_DETERMINED.

Rule confidence: confirmed. Missing inputs produce NOT_DETERMINED — never a forced answer. Sources: S-CO-12-155-103S-CO-12-155-108

07 Rule: CO-PLUMBING-CONTRACTOR

C.R.S. §12-155-108(3): a plumbing contractor must be registered — fee + workers' compensation and unemployment compensation evidence + be or employ a full-time master plumber in charge of all plumbing work ('A master plumber shall not be responsible for more than one plumbing contractor at a time'). Definition §12-155-103(10): any business that undertakes OR OFFERS TO UNDERTAKE plumbing work for another. NO bond and NO general-liability figure in the statute (verified absences). Missing facts yield NOT_DETERMINED.

Rule confidence: confirmed. Missing inputs produce NOT_DETERMINED — never a forced answer. Sources: S-CO-12-155-108S-CO-PC-PREVIEW

08 Rule: CO-HOMEOWNER-WORK

DPO permit information verbatim: a homeowner may do their own electrical/plumbing work only if (1) the work is personally performed by the homeowner, (2) the property is not for sale, resale, or rent and is not generally open to the public, (3) all work is inspected prior to covering and again upon completion, (4) the work complies with the NEC / adopted plumbing code — and a permit is obtained FIRST (homeowner is a 'qualified applicant' under §12-155-120(11)(c)). Each condition is a hard test; fail one and the exemption does not hold. Missing facts yield NOT_DETERMINED.

Rule confidence: confirmed. Missing inputs produce NOT_DETERMINED — never a forced answer. Sources: S-CO-DPO-PERMIT-INFOS-CO-12-155-120

09 Rule: CO-PERMIT-BEFORE-WORK

DPO verbatim: 'A valid Colorado State Electrical permit must be obtained prior to installing electrical wiring' and 'A valid Colorado State Plumbing permit must be obtained prior to installing plumbing.' Both board rule sets: 'Any work commencing prior to the purchase of a permit is subject to twice the prescribed permit fee.' The permit applicant must be a 'qualified applicant' (§12-155-120(11)). State permits are valid 12 months with ONE 6-month extension. Missing facts yield NOT_DETERMINED.

Rule confidence: confirmed. Missing inputs produce NOT_DETERMINED — never a forced answer. Sources: S-CO-DPO-PERMITSS-CO-CCR-720-1S-CO-CCR-710-1

10 The plumbing limb — license, permit before work, the owner path

A water heater replacement is plumbing work under the adopted Colorado Plumbing Code (IPC, with IFGC covering the fuel-gas connection) — so the state trade rules apply in full:

The employer registers plumbing apprentices within 30 days of initial employment (§12-155-108(2)) — an apprentice may not work unregistered on the job. State permit fee amounts remain NOT_VERIFIED (online system only).

11 Permit and inspection layer

The state decides WHO MAY WORK at the two state trades; the job-site county decides who permits and inspects. 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." In DPO-listed counties: "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 with no local program. S-CO-DPO-PERMIT-INFO

A permit is per JOB, a credential is per WHO: "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", and work started first costs twice the prescribed permit fee (3 CCR 720-1 / 710-1). Local building permits (roofing, mechanical, general) follow each jurisdiction's own schedule — LOCAL_AUTHORITY_REQUIRED. S-CO-DPO-PERMITS

Verify the credential that actually applies on the official lookup before relying on any outcome here: DORA License Lookup (covers every DPO credential) — Denver publishes its own Contractor License Search for local classes. S-CO-DPO-HOME

Evidence

Verification