Plumbing contractors in
Washington, District of Columbia.
A public directory of plumbing contractor businesses serving greater Washington. Market data, licensing requirements, and cost benchmarks — updated continuously from public sources.
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Common Job Costs
Licensing Requirements
Licensing Requirements
DC requires Master Plumber license and Journeyman Plumber license. Master Plumber: minimum 5 years experience (or equivalent education/apprenticeship), pass written exam covering code and safety, $150 application fee. Journeyman: minimum 4 years apprenticeship or equivalent, pass written exam, $125 application fee. Both require DC residency or business registration. Licenses renew every 2 years; continuing education not mandated but recommended. Examinations administered by DC Department of Buildings.
Permit Requirements
DC Department of Buildings requires permits for: new plumbing installations, water heater replacement, drain work exceeding routine cleaning, water supply line modifications, sewer line work, and any work affecting building code compliance. Commercial projects require separate commercial plumbing permits. Permit applications filed through DCRA online system; typical turnaround 5-10 business days for residential work.
Inspection Schedule
Initial inspection after rough-in plumbing (before walls closed); final inspection after all fixtures installed and system tested. Water pressure test required (60-80 psi). Backflow prevention devices inspected annually. Inspections scheduled through DC Department of Buildings; typical 2-3 day wait for inspection appointments.
Insurance Minimums
DC does not mandate specific minimums, but commercial work typically requires $1M general liability; residential contractors carrying $500K-$1M standard. Workers' compensation required if you have employees. Pollution liability and equipment coverage recommended for drain cleaning and excavation work.
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Local market snapshot
Source: DoorBase, aggregated public ZIP-level data. Updated 7/17/2026.
How to Get Licensed
Document Your Experience
Compile 5 years of verifiable plumbing work history (4 years for Journeyman). Gather timesheets, pay stubs, job photos, letters from employers, or apprenticeship certificates. DC Department of Buildings will verify employment history directly. Work must include hands-on plumbing installation, repair, and code-compliant practices—not just supervision or sales.
Register with DC Department of Buildings
Submit application for Master or Journeyman Plumber license to DC Department of Buildings, Licensing Division. Include completed application form, proof of experience, valid government-issued ID, and $150 (Master) or $125 (Journeyman) application fee. Confirm DC residency or valid business registration. Applications are reviewed within 10–15 business days; you'll receive notice of exam eligibility or requests for additional documentation.
Schedule and Pass the Licensing Exam
Once approved, register for the written examination administered by DC Department of Buildings. The exam covers DC plumbing code (based on International Plumbing Code), safety standards, fixture installation, drainage systems, water supply, venting, and gas line basics. Test is typically 100–150 multiple-choice questions; passing score is 70%. Exam can be taken at DC Department of Buildings office or approved testing center. Study materials available through DCRA website and industry prep courses.
Receive License and Maintain Registration
Upon passing exam, DC Department of Buildings issues your Master or Journeyman Plumber license (valid 2 years). License must be displayed at your place of business. Renew every 2 years by submitting renewal application and fee ($150 Master, $125 Journeyman). Continuing education is not mandated but recommended for code updates. If you allow license to lapse, reapplication and exam retake are required.
Obtain Business License and Insurance
Register your plumbing business with DC Department of Taxation and Revenue; obtain Occupational Business License ($150/year). Secure general liability insurance ($500K–$1M minimum recommended), workers' compensation if you have employees, and equipment/vehicle coverage. File proof of insurance with DCRA if required by client contracts or bonding agents. Insurance is not legally mandated by DC but is contractually required on most commercial and residential projects.
About This Market
DC's plumbing market runs tight—about 37 licensed establishments serving a dense urban population where 65% of housing stock predates 1980. That means old pipes, frequent emergency calls, and steady renovation work. Demand is consistent year-round, but you'll see seasonal spikes in spring (thaw damage, outdoor work) and fall (pre-winter prep). Competition is moderate; established contractors control most commercial work, but residential service calls stay distributed across independent operators. Labor costs track BLS median of $43.85/hour, but material markup and service call minimums push typical residential jobs into the $300-$500 range. Condo and rowhouse plumbing is standard; commercial HVAC coordination and high-rise work requires specialized credentials.
- Median hourly wageU.S. Bureau of Labor Statistics (BLS) Occupational Employment and Wages, May 2023
- Number of licensed establishmentsU.S. Census Bureau County Business Patterns, NAICS 4712 (Plumbing & HVAC Services)
- Licensing requirements and exam proceduresDC Department of Buildings, Licensing Division; DC Municipal Code Title 12, Chapter 3
- Permit requirements and proceduresDC Department of Buildings & DCRA online permit system
- Inspection standards and schedulingDC Department of Buildings Construction Inspection Division; DC Plumbing Code (adopted IPC)
- Insurance requirementsDC Department of Buildings; standard commercial contracting practices and bonding requirements
- Seasonal demand patternsIndustry practice and market analysis; BLS employment data by quarter
Frequently Asked Questions
What's required to get a Master Plumber license in Washington, DC?
DC requires 5 years of documented plumbing experience (or equivalent through formal apprenticeship), submission of work history to DC Department of Buildings, passing a written examination covering DC plumbing code and safety standards, and a $150 application fee. You must be at least 18 years old and have a high school diploma or GED. The exam tests knowledge of the International Plumbing Code as adopted by DC. Licenses are renewed every 2 years; no continuing education requirement, but the exam must be passed on first attempt or you retest within 6 months.
Do I need a permit for a water heater replacement in DC?
Yes. DC Department of Buildings requires a permit for any water heater replacement. You must file through the DCRA online portal, provide the old and new unit specifications, and pass a final inspection verifying proper installation, venting, relief valve, and pressure rating. Permit fees typically run $75-$150 depending on unit size. Expect 5-10 business days for permit approval on residential work. Gas water heater installations also require HVAC/gas line certification and may trigger additional DOEE (Department of Energy and Environment) review.
What's the typical cost range for a service call in Washington, DC?
A diagnostic service call (travel + inspection) runs $150–$250 depending on location within DC and time of day. If repair is needed, that's a separate labor charge. Emergency calls (nights, weekends, holidays) carry a 50–100% premium. Most plumbers charge a flat service call fee that applies toward the repair cost if the customer proceeds. Drain cleaning alone typically runs $300–$600 for residential lines. Data reflects BLS hourly rate of $43.85 and standard DC market markup for service calls.
How many licensed plumbers operate in Washington, DC?
Approximately 37 licensed plumbing establishments are registered with DC Department of Buildings (U.S. Census County Business Patterns data). This includes solo operators and small firms; actual number of individual licensed plumbers (Master and Journeyman combined) is higher. The market is moderately competitive; most established contractors focus on commercial and condo work, leaving residential service and repair work distributed among independents and smaller firms.
What inspections are required after plumbing work in DC?
DC Department of Buildings requires at minimum two inspections: rough-in inspection (after all piping installed, before walls/ceilings closed), and final inspection (after fixtures connected and system tested). Inspector verifies water pressure test (60–80 psi range), proper venting, backflow prevention devices, and code compliance. For commercial work or major renovations, additional inspections for gas lines or water supply modifications may be scheduled. Inspection requests are filed online; typical wait is 2–3 business days. Failed inspections require corrections and re-inspection.
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