Plumbing contractors in
Billings, Montana.
A public directory of plumbing contractor businesses serving greater Billings. Market data, licensing requirements, and cost benchmarks — updated continuously from public sources.
Plumbing jobs in Billings
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Common Job Costs
Licensing Requirements
Licensing Requirements
Montana requires Master Plumber (unrestricted), Journeyman Plumber, and Apprentice licenses. Master Plumber: 5 years documented experience as journeyman, pass written exam covering Montana Administrative Rules and National Plumbing Code, $150 exam fee, 3-year renewal with 30 hours continuing education. Journeyman Plumber: 4 years apprenticeship or equivalent documented experience, pass written exam, $100 fee, 3-year renewal with 20 hours CE. Apprentice: sponsor through registered training program, on-the-job training minimum 2000 hours per year. All licenses issued by Montana Department of Labor & Industry, Apprenticeship Section. Renewal required every 3 years.
Permit Requirements
City of Billings requires permits for all new plumbing installations, water heater replacements, and sewer line work. Permit application through Billings Building Department; $50-200 fee depending on project scope. Rough-in inspections required before walls closed. Final inspection before occupancy. Minor repairs and replacements under $500 may qualify for exemption—verify with building department before proceeding. Septic system work requires Yellowstone County Health Department approval.
Inspection Schedule
Rough-in inspection required after main lines installed but before concealment. Final inspection after all fixtures connected and system pressure-tested. Water heater installations require inspection within 5 days of completion. Sewer/septic work inspected in stages: excavation, pipe laying, backfill. Additional inspections required if any work fails initial inspection.
Insurance Minimums
Montana does not mandate specific liability minimums by statute for plumbers, but industry standard and bonding requirements typically require $500,000 general liability minimum, $1,000,000 preferred for commercial work. Workers' compensation required if you have employees—rates vary by classification. Equipment and tools coverage recommended. Verify with individual municipalities for any local requirements.
Compliance research unavailable
Source status: unavailable · 7/25/2026
Detailed instructions are withheld because the source is not available for verification.
Local market snapshot
Source: DoorBase, aggregated public ZIP-level data. Updated 7/17/2026.
How to Get Licensed
Step 1: Enroll in Registered Apprenticeship Program
Contact a registered plumbing apprenticeship sponsor in Billings or surrounding area (typically union locals, trade schools, or established plumbing companies). You must be at least 18 years old and have a high school diploma or GED. The sponsor will register you with Montana Department of Labor & Industry, Apprenticeship Section. You commit to 4 years of combined classroom (typically 144 hours per year) and on-the-job training (2000 hours per year minimum). Employer must be a licensed master or journeyman. Registration fee is typically $50-100.
Step 2: Complete On-the-Job Training Hours
Work under direct supervision of a Master or Journeyman Plumber for minimum 2000 hours per year for 4 years (8000 hours total). Document all hours worked, areas of training (water supply, drainage, venting, gas, etc.), and supervisor sign-offs on training log. Your employer or apprenticeship sponsor tracks compliance. Work must cover all plumbing disciplines required by Montana Administrative Rules. Failure to log sufficient hours delays progress; keep records organized and current monthly.
Step 3: Complete Classroom/Technical Instruction
Attend accredited plumbing apprenticeship classroom training (minimum 144 hours per year, 576 hours total over 4 years). Content covers Montana Plumbing Code, safety, blueprint reading, math for plumbing, materials, tools, and practice exams. Classes offered by trade schools, union apprenticeship coordinators, or online-hybrid formats. You pay tuition (typically $500-1500 per year depending on provider). Maintain passing grades (usually 70% minimum) to remain in apprenticeship. Upon completion, request transcripts and hour verification from apprenticeship coordinator.
Step 4: Apply for Journeyman Plumber Exam
After completing 8000 hours OJT and classroom requirement, request exam eligibility certification from your apprenticeship sponsor or Montana DOL Apprenticeship Section. Complete exam application form, pay $100 fee, and schedule exam date with Montana Department of Labor & Industry. Exam is offered quarterly at testing centers in Billings or Helena. Bring valid photo ID. Exam covers National Plumbing Code, Montana Plumbing Administrative Rules (ARM 24.200), safety, materials, venting, drainage, and code interpretation. Passing score is typically 70%.
Step 5: Pass Journeyman Exam and Receive License
Complete proctored exam (typically 100-150 multiple-choice questions, 4-5 hours). Passing score grants Journeyman Plumber license issued by Montana Department of Labor & Industry. License is valid for 3 years. You receive wallet card and official documentation. Register your license with the state—you can now work as a plumber under supervision of a Master or independently (jurisdiction-dependent; verify local rules). License renewal is required every 3 years with proof of 20 hours continuing education. Pay $100 renewal fee to DOL.
Step 6 (Optional): Advance to Master Plumber
After 5 years as a licensed Journeyman, accumulate 5 years of documented work experience and 10000+ hours in responsible charge of plumbing work. Apply for Master Plumber exam through Montana DOL ($150 fee). Exam covers advanced code, business management, contractor responsibilities, and complex system design. Passing score grants Master license, valid 3 years. As Master, you can operate independently, hire and supervise apprentices and journeymen, and sign off on installations. Master license renewal requires 30 hours continuing education and $150 fee every 3 years.
About This Market
Billings plumbing market is steady and competitive. You've got roughly 669 licensed plumbing establishments across Montana, with Billings and the surrounding Yellowstone County anchoring a solid residential and commercial base. Demand centers on new residential construction in growing subdivisions, remodels in older housing stock, and routine maintenance calls. The market is driven by freeze-thaw cycles—winter prep work and spring repairs after freeze damage keep phones ringing. Costs track with material prices and labor availability; competition is tight enough that you need efficiency to maintain margins. Service calls and emergency work carry premium pricing; new construction and large remodels move slower but hold better margins if you bid tight.
To work this market, you need a Master or Journeyman license from Montana DOL—no shortcuts. Factor in licensing renewal every 3 years with continuing education hours. Billings Building Department is organized and enforces permits consistently; don't cut corners on permitting or inspections—they will catch it and hold your work. Peak season runs April through September; staff up accordingly or you'll miss jobs. Winter is slower but profitable if you handle emergency calls and prep work. Know the difference between City of Billings jurisdiction and unincorporated Yellowstone County—septic work triggers Health Department review. Carry the liability insurance; single-trade contractors often get pushed to $1 million on commercial bids. Join the Montana Plumbing Association for code updates and networking. Water quality is hard in this region—educate clients on sediment traps and water softeners to build service call volume.
- Number of licensed plumbing establishments in MTU.S. Census Bureau, County Business Patterns (2022 estimate: 669 licensed establishments)
- Cost ranges for common plumbing servicesIndustry estimate based on regional labor rates and material pricing for Billings, MT market (2024)
- Peak season timingIndustry estimate based on regional climate and construction activity patterns in Yellowstone County, MT
- Montana plumbing licensing requirementsMontana Department of Labor & Industry, Apprenticeship Section; Montana Administrative Rules 24.200
- Billings permit requirements and feesCity of Billings Building Department, Municipal Code, and permit guidelines
- Inspection scheduleCity of Billings Building Department inspection procedures and Montana Plumbing Code requirements
- Insurance minimumsMontana statute review and industry standard practice for construction trades (no state-mandated minimums for plumbers)
- Average response timeIndustry estimate based on typical Billings contractor availability and workload patterns
Frequently Asked Questions
What is the difference between a Master and Journeyman plumber license in Montana?
Master Plumber license requires 5 years documented experience as a journeyman, passage of a comprehensive exam covering Montana Administrative Rules and National Plumbing Code, and can operate independently and supervise apprentices. Journeyman requires 4 years of apprenticeship training (minimum 2000 hours/year) or equivalent documented experience, passage of the journeyman exam, and can perform plumbing work under a master's supervision or independently in some jurisdictions. Both require 3-year renewal with continuing education (30 hours for master, 20 hours for journeyman). Source: Montana Department of Labor & Industry, Apprenticeship Section.
Do I need a permit for a water heater replacement in Billings?
Yes. City of Billings Building Department requires permits for all water heater replacements. You must apply before installation, pay the permit fee ($50-200 depending on project scope), and schedule a final inspection within 5 days of completion. The inspection confirms proper venting, gas or electrical connections, and T&P valve installation. Skipping this draws fines and voids the installation warranty. Contact Billings Building Department at (406) 657-8268 before you start work.
What is the peak season for plumbing work in Billings, MT?
April through September is the primary peak season; secondary spike in October-November before winter freeze conditions. Summer months drive new construction, remodels, and maintenance work. Winter months (November-March) are slower for new work but generate emergency calls from frozen pipes and freeze-damage repairs, which command premium pricing. Plan staffing and material inventory around this cycle. Source: Industry estimate based on regional climate and construction patterns.
What insurance do I need to operate as a plumber in Billings?
Montana does not mandate specific liability insurance minimums by statute, but industry standard is $500,000 general liability minimum, with $1,000,000 preferred for commercial work and larger remodels. Workers' compensation insurance is required if you have employees; rates are determined by job classification. Equipment and tools coverage is strongly recommended to protect vehicles and specialty equipment. Many larger projects and municipalities will require proof of $1M coverage before work begins. Confirm requirements with individual client contracts.
How long does it take to get a Journeyman Plumber license in Montana?
A registered apprenticeship program takes 4 years minimum at 2000 hours per year (total 8000 hours), with classroom instruction and on-the-job training. After completing apprenticeship hours, you pass the Journeyman exam administered by Montana Department of Labor & Industry ($100 fee). If you have equivalent documented plumbing experience outside an apprenticeship (rare), you may petition to test directly, but this requires proof of 4 years supervised experience. Total timeline is typically 4-5 years from apprentice start to licensed journeyman. Source: Montana Department of Labor & Industry.
Plumbing contractors in Billings
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