Denver Plumber License Requirements

Your State License Doesn't Cover Denver

Plenty of Colorado plumbers assume their DORA-issued license is all they need to work anywhere in the state. Then they show up to a Denver job site, try to pull a permit, and find out the City and County of Denver has its own contractor licensing system that operates independently of anything DORA administers.

Colorado is a Home Rule state. While DORA handles individual plumbing licenses (apprentice through master) and state contractor registrations, municipalities like Denver maintain complete control over local contractor registration, permitting, and inspections. You need both layers — the state credential and the Denver-specific registration — before you can legally start work within city limits.

Denver Contractor License Classes

Denver's Community Planning and Development (CPD) department issues contractor licenses in three classes: A, B, and C. Plumbing contractors should confirm with CPD which class applies to their scope of work.

To apply, you'll submit a Contractor License Application at the Wellington Webb Municipal Office Building along with:

• A Supervisor Statement of Responsibility
• A copy of your current state plumbing contractor card (showing active DORA registration)
• Proof of commercial general liability insurance
• Workers' compensation insurance documentation (if you have employees)

The Denver contractor license fee runs approximately $250, with renewals every three years. The supervisor certificate carries a separate $60 fee on the same renewal cycle.

Pulling Permits in Denver

Once your contractor license is active with CPD, you can apply for plumbing permits on specific projects. Denver requires permits for essentially all plumbing installations, including water heater replacements — which the state classifies as plumbing work requiring a licensed plumber and a registered contractor.

Inspections in Denver follow a two-stage process: a rough-in inspection before walls are closed up, and a final inspection after completion. Starting work before the permit is issued or covering work before the rough-in inspection is approved can result in stop-work orders and mandatory removal of drywall or other finishes to expose the work for review.

Insurance Requirements

Denver's insurance thresholds often surprise contractors who've been working in less stringent jurisdictions. CPD typically requires commercial general liability coverage, and some project types require naming the municipal building department as an additional insured party on your certificate.

If you have employees, you must carry workers' compensation insurance. Under Colorado Department of Labor and Employment rules, even LLC members and corporate officers are legally classified as employees — unless they own at least 10% of the company, hold an officer title, and file a formal rejection of coverage. Failure to carry required workers' compensation can result in fines of up to $500 per day.

How Denver Compares to State-Level Registration

Think of the licensing layers this way: DORA confirms you're technically qualified to do plumbing work (your individual license) and that your business is registered as a contractor (your state registration). Denver confirms that your registered business is authorized to operate within city limits, meets local insurance requirements, and has a designated supervisor on record.

Neither layer substitutes for the other. Operating without the Denver registration while holding a valid state license is still a violation — and vice versa.

What This Means for Your Timeline

If you're already state-licensed and state-registered as a contractor, adding Denver's local registration is mostly a paperwork and insurance exercise. Budget a few weeks for processing, and make sure your liability insurance certificates are current before you apply.

If you're still working toward your state license, handle that first — Denver requires your active state contractor card as part of the application. The Colorado Plumber License Guide walks through every step of the state process, from apprentice registration through contractor setup, so you can get the state layer squared away before tackling Denver's local requirements.

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