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MI Compliance Guide Verified for 2026/2027 Plumbing & Water Systems

Michigan Plumbing Contractor

Official statutory licensing standards, state surety bond mandates, and commercial liability minimums overseen by the Michigan Department of Licensing and Regulatory Affairs (LARA). Satisfy General Contractor (GC) compliance requirements and secure instant digital ACORD 25 certificates to keep your plumbing contractor crew jobsite-ready.

Audited by Pasi Tapio Hakamaki • Editorial Review: September 2026 • Statutory Authority: Michigan Department of Licensing and Regulatory Affairs (LARA)
Min General Liability
$500,000
Occurrence / $1,000,000 General Aggregate
Required State Bond
$10,000 Maintenance & Alteration Bond
From $160/yr with preferred credit
Board Application Fee
$195
Exam Provider: PSI Services
License Renewal
Triennial
CE: Varies by municipality or trade board
✓
Primary Source Verified: 2026 Statutory Code Review
Requirements cross-referenced against the official Michigan Department of Licensing and Regulatory Affairs (LARA) administrative code.
Official MI Board Portal → | Our Audit Methodology
Interactive Compliance Tool Live 2026 Underwriting Matrix

Contractor Liability & Bond Premium Estimator

Estimate your required general liability and state license bond costs instantly based on state statute and operational volume.

Target Jurisdiction
Michigan (MI)
Trade Classification
Plumbing Contractor
Estimated Annual Gross Revenue $350,000
$50k $1.5M $3M+
Estimated Statutory Costs Instant Certificate Available
General Liability (GL)
$500,000 Each Occurrence / $1,000,000 General Aggregate
$241/mo
~$2,888 / year
Contractor License Bond
Michigan $10,000 Bond
$100/yr
1.0% (Tier 1 Preferred) on $10,000 bond
Workers' Comp Alert: In Michigan: Mandatory for employers with 3+ employees or 1+ employee working 35+ hours/week for 13+ weeks; GCs mandate coverage for all active crews (Mich. Comp. Laws § 418.115 & § 418.611).
Review Governing Statutory Citations Explore 50-State Licensing Directory →

*Estimates based on standard market rates for commercial artisan contractors. Exact quotes require underwriting review of prior loss history, specific endorsements, and payroll declarations.

Plumbing Contractor Scope of Work & Legal Permitting Authority

Plumbing Contractors handle domestic water supply, sanitary drainage, venting, medical gas, and underground infrastructure.

Defined Authorized Scope of Construction:

Sewer main replacements, rough-in DWV piping, commercial boilers, backflow prevention, natural gas piping, and water filtration plants.

Permit Trigger in Michigan: All water heater replacements, sewer line taps, and gas line alterations
Minor Work Exemption Threshold: $600 total contract amount (MCL 339.6001 Residential Maintenance & Alteration)

Mandatory Experience Prerequisites

4 to 5 years verified apprenticeship and journey-level plumbing experience, Uniform Plumbing Code (UPC/IPC) exam pass

Required Insurance Policy Endorsements

Water Damage Liability Extension, Underground Resources Endorsement, Pollution Liability (CPL)

Governing Technical Code & Safety Standard
Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act)
Uniform Plumbing Code (UPC) / International Plumbing Code (IPC) & ASSE 5000
Testing & Compliance Benchmarks: ASSE 1013 reduced pressure backflow testing and NSF/ANSI 61 lead-free potable water certifications. Enforces DWV hydrostatic pressure tests, anti-scald mixing valve calibration, and municipal sewer connection permits.
Procedural Roadmap

How to Obtain a Plumbing Contractor License in Michigan

Official 4-step compliance path pursuant to Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act).

Official Board Rules →
1

Legal Entity & EIN Formation

Michigan Business Entity Filing Statutes

Form your business entity (LLC, Corporation, or Sole Proprietorship) with the Michigan Secretary of State and secure your Federal Employer Identification Number (FEIN). Ensure your registered business name precisely matches all state and municipal filings.

2

Designate Qualifying Individual (QI)

Michigan Department of Licensing and Regulatory Affairs (LARA) Experience Verification Rules

Appoint a Qualifying Party, Primary Qualifying Agent, or Responsible Managing Employee (RME). The QI must verify 4 to 5 years verified apprenticeship and journey-level plumbing experience, Uniform Plumbing Code (UPC/IPC) exam pass and satisfy experience criteria governed under Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act).

3

Execute Statutory Bond & Insurance

Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act) Financial Responsibility Mandates

Secure the mandatory $10,000 Maintenance & Alteration contractor license bond executed by an admitted surety. File an official Certificate of Insurance (COI) maintaining at least $500,000 Each Occurrence / $1,000,000 General Aggregate Commercial General Liability, naming Michigan Department of Licensing and Regulatory Affairs (LARA) as certificate holder.

4

Examination & Board License Issuance

PSI Services Candidate Information Bulletin (CIB)

Complete the Michigan Business & Law examination along with the specific Plumbing Contractor technical trade examination administered by PSI Services. Submit application fees ($195) to receive official licensure and permit pull authorization.

Regulatory Authority: Michigan Department of Licensing and Regulatory Affairs (LARA) (MI)
Official State Government Portal

Ready to file with the Michigan Department of Licensing and Regulatory Affairs (LARA)?

Make sure your statutory $10,000 Maintenance & Alteration Bond (and for LLC entities, your General Liability Certificate listing the state licensing board as certificate holder) are electronically active prior to submitting application fees.

Visit Official MI Board Portal Calculate Statutory Minimums →
Verified Statutory Guidance

Michigan Plumbing Contractor Compliance & Insurance FAQs

Direct answers on state licensing prerequisites, insurance thresholds, and surety bond regulations.

Is a state contractor license legally mandated for Plumbing Contractors in Michigan?

Yes, executing commercial or residential plumbing contractor projects in Michigan legally requires an active state contractor license issued by the Michigan Department of Licensing and Regulatory Affairs (LARA) under Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act). Performing contracting services without official board credentials triggers immediate stop-work orders, statutory fines, and civil citations.

What technical codes govern plumbing contractor operations in Michigan?

Plumbing Contractor installations in Michigan must strictly adhere to the Uniform Plumbing Code (UPC) / International Plumbing Code (IPC) & ASSE 5000. In addition, all completed work and materials must satisfy ASSE 1013 reduced pressure backflow testing and NSF/ANSI 61 lead-free potable water certifications to pass municipal building inspection.

What are the commercial general liability insurance minimums for Plumbing Contractors in Michigan?

Plumbing Contractors in Michigan typically must maintain a minimum of $500,000 Each Occurrence / $1,000,000 General Aggregate in commercial general liability insurance. Under Michigan statutory rules and General Contractor (GC) bid standards, policies must cover bodily injury, property damage, and completed operations to secure jobsite clearance.

How much does the required Michigan Plumbing Contractor surety bond cost?

A Michigan plumbing contractor license bond costs between $160 and $240 per year for contractors with standard credit, satisfying the statutory $10,000 Maintenance & Alteration bond requirement. High-risk credit profiles range from $288 to $400 annually. Premium rates are calculated as a percentage of the total bond penal sum.

Is workers' compensation insurance required for Plumbing Contractors in Michigan?

Yes, proof of active workers' compensation insurance is required for construction employers in Michigan. Under Mich. Comp. Laws § 418.115 & § 418.611, coverage is mandatory for employers with 3+ employees or 1+ employee working 35+ hours/week for 13+ weeks; GCs mandate coverage for all active crews. General Contractors and municipal building inspectors mandate a Certificate of Insurance (COI) prior to jobsite access. Sole proprietors with 0 employees: Sole proprietors with 0 employees exempt under MCL 418.161; can file Form WC-337 Notice of Exclusion with WDCA.

Does Michigan offer contractor license reciprocity for Plumbing Contractors?

No, Michigan does not maintain universal license reciprocity for plumbing contractors. Out-of-state applicants must satisfy Michigan's individual experience verification under Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act) and complete PSI Services testing.

Primary Sources

Official Statutory Citations & Legal Authorities

Jurisdiction: Michigan (MI)
Primary Licensing Authority
Michigan Department of Licensing and Regulatory Affairs (LARA)
Official State Portal Link →
Enabling State Statute / Administrative Code
Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act)
Statutory authority for trade licensing & discipline
Mandatory License Bond Statute
$10,000 Maintenance & Alteration Bond
Continuous penal surety bond filing
Governing Technical Code & Testing Standards
Uniform Plumbing Code (UPC) / International Plumbing Code (IPC) & ASSE 5000
Testing Provider: PSI Services • ASSE 1013 reduced pressure backflow testing and NSF/ANSI 61 lead-free potable water certifications
PTH
Statutory Research Standards & Verification Desk

Audited by Pasi Tapio Hakamaki • Managing Editor

This compliance benchmark for Michigan Plumbing Contractors is audited against primary state legislative statutes (Michigan Compiled Laws MCL 339.6001–6023 (Skilled Trades Regulation Act)) and administrative rules published by the Michigan Department of Licensing and Regulatory Affairs (LARA). TradeCertify maintains strict editorial independence. If you represent a regulatory body or note an erratum in statutory bond limits, please contact our research desk.

Contractor Compliance Desk
Official Statutory Minimums
Official MI Portal