Quick Answer: Plumbing companies in Denver must hold a Colorado state plumbing license and a City and County of Denver contractor license for permitted work. Denver plumbing companies charge $90–$165 per hour for standard residential work. At exactly 5,280 feet, Denver’s altitude affects water heater combustion and venting, its water supply carries Rocky Mountain mineral content, and winters regularly drop below 0°F — all factors that make locally experienced plumbing companies important.
What Licenses Should a Denver Plumbing Company Hold?
Colorado state plumbing license — issued by the Colorado State Plumbing Board under the Department of Regulatory Agencies (DORA). License classifications include Master Plumber, Journeyman Plumber, and Apprentice Plumber. Verify at my.colorado.gov/oplc.
City and County of Denver contractor license — issued by the Denver Community Planning and Development (CPD) department. For permitted work within Denver city limits, the plumbing company must hold a Denver contractor license in addition to the state license.
Note that Denver’s surrounding cities — Aurora, Lakewood, Arvada, Westminster, Englewood — each have their own permit offices and may have separate local registration requirements. Confirm which jurisdiction your address falls under before scheduling permitted work.
How to Find a Licensed Plumbing Company in Denver
Step 1: Use a directory filtered to Denver. The Denver metro is large, spanning multiple counties and dozens of municipalities. Browse licensed plumbing companies in Denver at PlumberLocator.us — Denver Plumbers.
Step 2: Verify the Colorado state license. Ask for the state license number and confirm it at my.colorado.gov/oplc. Check for Active status and any disciplinary actions on file.
Step 3: Confirm Denver city contractor license for city work. For permitted work inside Denver city limits, confirm the company holds a current Denver contractor license through Denver CPD. Ask to see the license number before scheduling permitted work.
Step 4: Ask about altitude-specific water heater experience. At 5,280 feet, gas appliance sizing and venting is different from sea level. A Denver plumbing company experienced in the metro will handle this correctly without prompting.
What Do Plumbing Companies Charge in Denver?
| Service | Typical Rate |
|---|---|
| Standard residential (business hours) | $90–$165/hour |
| Emergency / after-hours | $160–$375/hour |
| Service call fee | $60–$130 |
| Drain cleaning (single fixture) | $110–$255 |
| Sewer camera inspection | $175–$375 |
| Water heater replacement (tank) | $950–$2,800 |
| Tankless water heater installation | $1,500–$4,200 |
| Pipe thaw (frozen pipe) | $150–$375 |
| Whole-house repipe (PEX) | $4,500–$13,000 |
For national cost context, see how much a plumber costs.
What Services Do Denver Plumbing Companies Offer?
High-altitude water heater installation and venting. Denver sits at exactly one mile above sea level. At this altitude, atmospheric pressure is about 17% lower than at sea level, reducing oxygen availability for gas combustion. Water heaters and boilers must be derated or specified as high-altitude units to perform correctly. Flue sizing for natural-draft appliances also changes at altitude. Experienced Denver plumbing companies know these specifications — a plumber relocating from a low-elevation market may not.
Hard water maintenance. Denver’s water supply, drawn from Rocky Mountain snowmelt via the South Platte River and several reservoirs, carries moderate mineral content — typically 100–200 mg/L hardness. This accumulates inside water heater tanks and on heating elements. Annual flushing is standard maintenance in Denver; many homeowners also install whole-house water softeners to extend fixture and appliance life.
Frozen pipe repair and prevention. Denver winters regularly produce temperatures below -10°F. Supply lines in exterior walls, crawl spaces, and unheated garages are vulnerable. Frozen pipe thawing is a high-volume winter service for Denver plumbing companies. If you have supply lines in these locations, insulate them before October.
Sewer camera inspection. Denver’s established neighborhoods — Capitol Hill, Congress Park, Washington Park, Park Hill — have aging sewer laterals prone to root intrusion and joint separation. Camera inspection before purchasing any pre-1970s Denver home is standard practice. For what a scope involves, see what is a sewer camera inspection and what does it cost.
Tankless water heater installation. Tankless units are increasingly popular in Denver because they eliminate the tank sediment problem caused by hard water and handle altitude adjustments more reliably than many older tank units. An experienced Denver plumbing company will size a tankless unit correctly for both altitude and flow demand.
Frequently Asked Questions About Denver Plumbing Companies
Does Denver require a permit for water heater replacement?
Yes. The City and County of Denver requires a permit for water heater replacement. The permit is pulled by the licensed plumbing contractor. Denver also requires an inspection of the completed installation. Surrounding cities (Aurora, Lakewood, Arvada) have the same requirement through their own permit offices.
Why does altitude affect water heater installation in Denver?
At 5,280 feet, air contains roughly 17% less oxygen than at sea level. Gas burners need to be adjusted for this reduced oxygen — a standard sea-level water heater will underperform and may produce elevated carbon monoxide if not adjusted. High-altitude water heaters have modified orifices and burner configurations. Denver plumbing companies routinely handle these specifications; request confirmation that the unit being installed is rated or adjusted for Denver’s elevation.
What neighborhoods in Denver have the oldest sewer lines?
Denver’s oldest sewer infrastructure is concentrated in the inner-ring neighborhoods: Capitol Hill, Cheesman Park, Curtis Park, Five Points, Whittier, and West Highland. Homes in these areas built before 1940 are most likely to have clay tile sewer laterals susceptible to root intrusion. Camera inspection is especially important before purchasing in these neighborhoods.
How do Denver’s surrounding suburbs differ from the city for permitting?
Aurora, Lakewood, Englewood, Arvada, Westminster, and other Denver suburbs are separate municipalities with their own building departments and permit systems. A plumbing company licensed and registered in Denver city must also meet each suburb’s local registration requirements for permitted work in those jurisdictions. Most established Denver metro plumbing companies are registered across multiple jurisdictions — confirm this for your specific address.
Also in Colorado: Plumbing companies in Colorado Springs, CO
Find licensed plumbing companies in Denver at PlumberLocator.us — Denver, CO.