Plumbing contractors in
St Louis, Missouri.
A public directory of plumbing contractor businesses serving greater St Louis. Market data, licensing requirements, and cost benchmarks — updated continuously from public sources.
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Common Job Costs
Licensing Requirements
Licensing Requirements
Missouri requires Master Plumber and Journeyman Plumber licenses through the State Board of Plumbing. Journeyman: minimum 4 years documented apprenticeship (8,000 hours) or equivalent experience, pass written exam covering code, safety, and installation methods. Master: 2 years journeyman experience, additional exam covering business and advanced installation. Licenses renew annually with continuing education requirements (12-24 hours depending on license type). No statewide reciprocity—out-of-state licenses require examination.
Permit Requirements
St. Louis City and County require plumbing permits for most work except minor repairs. Permit applications must include licensed plumber signature. Inspections required at rough-in stage and final completion. Residential work typically requires 1-2 inspections; commercial projects may require additional inspections. Permit fees range $50-$300 depending on project scope. Work without permits can result in fines ($500+) and mandatory re-inspection.
Inspection Schedule
Initial rough-in inspection after pipe installation, before walls are closed. Final inspection after all fixtures installed and system tested for leaks and proper drainage. Commercial projects may require additional inspections at pressure test stage. City of St. Louis typically schedules inspections within 3-5 business days of request. Work cannot proceed to next phase without passing previous inspection.
Insurance Minimums
Missouri does not mandate specific liability minimums by statute, but most commercial contracts require $1,000,000 general liability and $1,000,000 workers' compensation. Residential clients typically expect $300,000-$1,000,000 general liability. Bonding may be required for public works projects. Most established contractors carry $1,000,000+ coverage to remain competitive.
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Source status: unavailable · 7/31/2026
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Local market snapshot
Source: DoorBase, aggregated public ZIP-level data. Updated 7/17/2026.
How to Get Licensed
Step 1: Register as an Apprentice
Enroll in a registered plumbing apprenticeship program with an employer or through a trade union (UA Local 562 in St. Louis area). Complete registration with Missouri Department of Higher Education. Apprenticeship must document 8,000+ hours of on-the-job training plus classroom instruction (typically 144-180 classroom hours per year). Employer or union programs handle registration; individual registration is not permitted.
Step 2: Complete Apprenticeship Hours and Classroom
Work minimum 4 years (2,000 hours per year) under a licensed journeyman or master plumber. Complete required classroom hours covering Missouri Plumbing Code, National Standard Plumbing Code, safety practices, and installation techniques. Keep detailed time records—the Board audits apprenticeship documentation. Most apprenticeships require 36-48 months of concurrent work and classroom to be eligible for exam. Some prior plumbing experience may be credited (typically 2 years work = 1 year apprenticeship, capped at 50%).
Step 3: Apply for Journeyman Exam
Submit application to Missouri State Board of Plumbing with proof of 8,000 hours apprenticeship, classroom completion, and signed supervisor verification. Application fee is approximately $200-$300. Board reviews documentation (allow 2-4 weeks). Once approved, you receive exam authorization. Schedule exam through PSI (Professional Services Industries) or Pearson Vue. Exam covers code knowledge, installation methods, safety, and local regulations. Pass/fail result typically within 24-48 hours.
Step 4: Pass Journeyman Plumber Exam
Exam is 150 questions, 4 hours, multiple choice covering Missouri and National Code, local ordinances, and installation best practices. Questions weighted toward practical application and code compliance. Study materials available through trade unions and plumbing schools. Exam cost is $150-$250. Passing score is typically 70-75% (varies by year). Failing applicants may retest; most boards allow 2-3 retests per application period without reapplying.
Step 5: Receive Journeyman License and Work
Upon passing exam, Missouri Board issues Journeyman Plumber license valid for one year. License renews annually with continuing education (12 classroom hours minimum per year). License allows you to work independently and sign off on residential plumbing work. You cannot yet employ apprentices or sign commercial/industrial projects without a Master license. Annual renewal requires CE hours documentation and $150-$200 renewal fee. Some continuing education can be obtained through online or trade school courses.
Step 6: Advance to Master Plumber (Optional but Recommended)
After 2+ years active journeyman experience, apply for Master Plumber exam. Requires 4,000+ hours documented master-level work (supervision, complex installations, commercial projects). Master exam covers advanced code, business practices, and supervisory responsibilities. Same testing process as journeyman—apply, receive authorization, schedule exam. Pass rate for master exam is typically 60-65%; study required. Master license allows you to own a plumbing company, employ and supervise apprentices, bid commercial/industrial projects, and sign off on all plumbing work in Missouri.
Step 7: Maintain Annual Licensure
Renew license annually before expiration. Submit continuing education hours (12-24 depending on license type), renewal fee ($150-$200), and proof of insurance if operating a company. CE must come from approved providers (trade unions, community colleges, plumbing manufacturer courses). Some states reciprocate with Missouri—verify if you plan to work multi-state. Maintain detailed records of all apprentices supervised, projects completed, and continuing education for Board audits and professional liability defense.
About This Market
St. Louis plumbing market runs steady year-round with regional pressure from 1,879 licensed establishments across Missouri competing for work. Demand stays consistent due to aging housing stock in the metro area—pipes, water heaters, and fixtures fail on schedule. Residential emergency calls and replacements drive bread-and-butter revenue; new construction and commercial retrofits provide higher-ticket work. Labor costs sit at $75k annually average wage (BLS), but experienced master plumbers in metro St. Louis command $85k-$120k with established client bases. Competition is moderate to heavy depending on neighborhood—suburban areas see more new construction demand, while city proper drives repair and replacement work. Winter weather drives frozen pipe emergencies, spring thaw creates pressure testing backlog, and summer kitchen/bath remodels keep crews booked. Material costs vary with copper and PVC pricing; most jobs run 20-40% labor, 30-50% materials, 15-20% overhead and profit margin.
- median hourly wage and annual salaryU.S. Bureau of Labor Statistics (BLS), May 2023 Occupational Employment and Wages for Plumbers
- number of licensed plumbing establishments in MissouriU.S. Census Bureau, County Business Patterns, NAICS 4711 (Plumbing, Heating, AC Contractors)
- licensing requirements, exam structure, apprenticeship hoursMissouri State Board of Plumbing, Licensing Division, Official Rules and Regulations (19 CSR 30-32)
- permit requirements and inspection schedule for St. LouisCity of St. Louis Building Division, Department of Public Safety; St. Louis County Department of Planning
- continuing education requirements and renewal proceduresMissouri State Board of Plumbing, Annual License Renewal Guidelines and Approved Continuing Education Providers
- service costs and market rates in St. Louis metroAngie's List, HomeAdvisor contractor data; regional plumbing contractor associations and union wage scale data
- peak season demand patternsSt. Louis Regional Chamber and Growth Association economic data; seasonal construction industry reports
Frequently Asked Questions
What are the actual costs for a service call from a St. Louis plumber?
Most St. Louis plumbers charge $150-$350 for a service call that includes diagnosis and minor repair (faucet washers, trap clearing, running toilet fix). Complex repairs or replacements run $250-$600 per fixture. Emergency/after-hours calls typically add 50-100% surcharge. BLS data shows St. Louis plumbers average $36.06/hour ($75,005 annually), but service calls bundle diagnosis time, mileage, and parts markup. Call around—established contractors often charge flat rates for common jobs, while newer shops may bid per-hour labor.
Do I need a permit for plumbing work in St. Louis?
Yes. St. Louis City and St. Louis County both require permits for plumbing work except minor repairs (faucet washers, aerator cleaning). Permit requires a licensed plumber signature and costs $50-$300 depending on scope. Work without a permit can result in $500+ fines and mandatory re-inspection at your cost. Commercial work and new construction always require permits and inspections at rough-in and final stages. Check with your specific jurisdiction—city, county, and some municipalities have slightly different thresholds.
What license do I need to work as a plumber in Missouri?
Missouri requires either Journeyman or Master Plumber license through the State Board of Plumbing. Journeyman requires 4 years documented apprenticeship (8,000 hours minimum) plus passing the state exam. Master requires 2+ years journeyman experience and an additional exam. Licenses renew annually with continuing education (12-24 hours). Apprenticeship must be registered with the Missouri Department of Higher Education. No reciprocity for out-of-state licenses—you must pass Missouri's exam. The exam covers Missouri plumbing code, National Standard code, safety, and installation methods.
What insurance do plumbers need in Missouri?
Missouri does not mandate specific minimums by law, but industry standard is $1,000,000 general liability and $1,000,000 workers' compensation. Residential clients expect $300,000-$1,000,000 general liability; commercial clients and larger GCs require $1,000,000+. Most established St. Louis plumbers carry $1M/$1M to remain competitive and insurable. Workers' comp is legally required if you have employees. Bonding may be required for public works and municipal contracts. Shop rates run $50-$200/month for basic coverage depending on crew size and claims history.
When is the busiest season for plumbers in St. Louis?
Peak season runs April-September, with the heaviest demand in May-June and August-September during remodeling season. Spring thaw (March-April) creates frozen pipe emergencies and pressure testing backlog. Winter months (December-February) see emergency calls for frozen pipes and heating system issues but fewer new projects. Summer is kitchen and bath remodel season. Plan crew scheduling and material orders 3-4 weeks ahead during peak or you'll turn away work. Emergency calls year-round provide baseline revenue, but service-only shops should expect 30-40% slower winter months.
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