1.2 Permits, Applications, Inspections & Code Enforcement

1.2 Permits, Applications, Inspections & Code Enforcement

Quick Reference: The administration and enforcement of plumbing work in Michigan are governed by the 2021 Michigan Plumbing Code (MPC) (effective March 12, 2024), promulgated under Part 7 of the Construction Code Commission General Rules (R 408.30701 through R 408.30796). The 2021 MPC incorporates the International Plumbing Code (IPC) with specific Michigan deletions, additions, and amendments.

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The Administrative Mandate of the Michigan Plumbing Code

Under Michigan law (1972 PA 230, the Stille-DeRossett-Hale Single State Construction Code Act, MCL 125.1501 et seq.), the Michigan Plumbing Code has statewide application. The code applies to all new construction, alterations, repairs, replacements, equipment, appliances, fixtures, fittings, and appurtenances associated with plumbing systems throughout the state.

Jurisdictional Enforcement

• Bureau of Construction Codes (BCC): Directly administers and enforces the plumbing code in all municipalities, townships, and counties that have not formally elected to administer their own plumbing enforcement program.
• Local Enforcing Agencies: Municipalities that pass an ordinance electing to administer their own code enforcement program must employ plumbing inspectors registered under the Building Officials and Inspectors Registration Act (1986 PA 54, MCL 338.2301 et seq.). Local ordinances cannot weaken or conflict with the state code, and under MCL 339.6125(1) a governmental subdivision may not exempt itself from Article 11 licensing or impose local licensing.
• The Code Official (Plumbing Inspector): The executive official in charge of plumbing code enforcement. The code official has statutory authority under MPC Chapter 1 to review plans, issue permits, inspect jobsites, demand required pressure tests, issue notices of violation, and post Stop Work Orders.

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When a Plumbing Permit Is Required

In accordance with MPC Section 106.1, an owner, authorized agent, or licensed plumbing contractor who intends to construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert, or replace any plumbing system must first submit an application to the code official and obtain the required plumbing permit.

Permit Application & Plan Review Requirements

For standard residential single-family work, permits are typically issued upon submission of a standard application and fee schedule. However, for commercial, educational, institutional, and industrial facilities, detailed plans and engineering specifications sealed by a Michigan-licensed architect or professional engineer must be submitted for plan review prior to permit issuance. Plan review is mandatory when:

• Plumbing installations involve healthcare facilities, hospitals, and nursing homes.
• Drainage systems incorporate commercial grease interceptors, acid neutralization systems, or flammable oil/sand separators.
• Buildings exceed two stories or contain complex engineered venting and pumped sewage ejector networks.
• Water services exceed 2 inches in diameter or incorporate complex backflow prevention assemblies.

Permit Expiration and Invalidation

• 180-Day Rule: A plumbing permit becomes invalid if the authorized work is not commenced within 180 days after permit issuance, or if the work is suspended or abandoned for a period of 180 consecutive days after work begins.
• Extensions (Michigan R 408.30715, amending 106.5.4): The authority having jurisdiction may grant a 180-day extension of the original 180-day permit period on presentation by the permittee of a satisfactory reason for failure to start or complete the work. Michigan's amended 106.5.3 also provides that a permit may be reinstated if the code has not changed; if the code has changed and work was not started, a new permit must be obtained, provided the suspension or abandonment has not exceeded 1 year.

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Exempt Work vs. Permit-Required Work

The Michigan Plumbing Code provides very narrow exemptions where work may proceed without pulling a permit. A common misconception on licensing exams is that "minor replacements" do not require permits. In reality, replacing any piping, water heater, or fixture valve requires a permit.

Exam Trap Alert: If a leak repair requires cutting out and replacing a section of copper water pipe or replacing a leaking shutoff valve, a permit is required. Work is only exempt if the repair does not involve the replacement or rearrangement of valves, pipes, or fixtures.

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Authorized Permit Applicants: Contractors vs. Homeowners

Michigan law strictly limits who may apply for and receive a plumbing permit.

+--------------------------------------------------------------------------+
|                       WHO CAN PULL A PERMIT?                             |
|                                                                          |
|   1. LICENSED PLUMBING CONTRACTOR                                        |
|      - Must designate a full-time Master Plumber of record.              |
|      - Authorized for ALL commercial, industrial, & residential work.    |
|                                                                          |
|   2. QUALIFYING HOMEOWNER (MCL 339.6107(2)(d))                           |
|      - Must own AND occupy the single-family dwelling as primary home.   |
|      - Must personally perform all installation work.                    |
|      - CANNOT pull permits on rental property, duplexes, or flips.       |
+--------------------------------------------------------------------------+

The Homeowner Permit Exception (MCL 339.6107(2)(d))

MCL 339.6107(2)(d) states that a license is not required for "the installation by a homeowner of his or her own plumbing, building sewer, or private sewer in his or her single-family dwelling if a permit is secured." The practical restrictions enforced by Michigan enforcing agencies are:

1. Owner-Occupied Primary Residence: The property must be a detached single-family home that is currently owned and occupied by the applicant, or is being constructed as the applicant's personal primary residence.
2. Personal Work Mandate: The homeowner must personally install the plumbing piping and fixtures. It is a direct statutory violation for a homeowner to pull a permit and then hire an unlicensed individual, handyman, or sub-contractor to do the work.
3. Explicit Disqualifications: Homeowner permits are strictly prohibited on:
   • Rental properties, apartment buildings, duplexes, or condominiums.
   • Commercial, industrial, or agricultural business properties.
   • Homes being renovated for immediate resale or investment ("flipping").
4. Code Compliance & Liability: The homeowner is held to the exact same standards of the Michigan Plumbing Code as a licensed contractor and must schedule all required inspections.

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The Three Mandatory Inspection Milestones

Plumbing systems must be inspected and approved by the code official in distinct sequential phases. Covering or concealing piping before inspection is a major code violation.

+-------------------------------------------------------------------------+
|                        INSPECTION TIMELINE                              |
|                                                                         |
|   [1] UNDERGROUND / UNDERSLAB INSPECTION                                |
|       - Piping in open trenches; 10-ft water head or 5 psi air.         |
|       - MUST PASS BEFORE BACKFILLING OR POURING CONCRETE SLAB.          |
|                                   |                                     |
|                                   v                                     |
|   [2] ROUGH-IN INSPECTION                                               |
|       - DWV stacks, vents, supply risers installed in framing.          |
|       - Hydrostatic or pneumatic pressure test active.                  |
|       - MUST PASS BEFORE DRYWALL, LATH, OR INSULATION CONCEALMENT.      |
|                                   |                                     |
|                                   v                                     |
|   [3] FINAL INSPECTION                                                  |
|       - All fixtures set, trim complete, water heater operational.      |
|       - System pressurized, traps primed, temp limits verified.         |
|       - CERTIFICATE OF OCCUPANCY / FINAL APPROVAL ISSUED.               |
+-------------------------------------------------------------------------+

1. Underground / Underslab Inspection

• Timing: Requested after all underground drainage, building drains, water service piping, and under-slab vent lines are installed, bedded, and supported in open trenches, but prior to any backfill or concrete pouring.
• Testing Requirements:
  • DWV Piping: Must be tested with a water test consisting of filling all piping with water to a minimum of a 10-foot head (measured from the highest point of the section under test), or an air test of not less than 5 psi (34.5 kPa) using an approved gauge for a minimum duration of 15 minutes with zero pressure loss.
  • Water Service and Distribution (MPC 312.5): Tested and proved tight under water pressure not less than the working pressure of the system, or - for piping systems other than plastic - by an air test of not less than 50 psi, held for not less than 15 minutes.
• Verification: Trench bottom stability, minimum slope (1/4" or 1/8" per foot), pipe bedding, and sleeve protection through foundation footings.

2. Rough-In Plumbing Inspection

• Timing: Conducted after all rough piping—including soil and waste stacks, branch drains, re-vents, vent stacks, water distribution lines, and fuel gas piping—is installed throughout the framing, but strictly before walls, ceilings, and floors are enclosed by drywall, plaster, lath, or thermal insulation.
• Testing Requirements:
  • DWV lines must be capped and held under 10-foot water head or 5 psi air test.
  • Potable water distribution lines are tested under MPC 312.5: water pressure not less than the working pressure of the system, or (for non-plastic piping) air at not less than 50 psi, held not less than 15 minutes.
  • Fuel gas piping is outside the scope of the Michigan Plumbing Code (MPC 101.2 assigns gas piping to the Michigan Mechanical Code) and is tested under the International Fuel Gas Code as referenced by that code.
• Concealment Penalty: If rough plumbing is covered without written approval from the inspector, the code official has the legal authority to order the immediate removal of all drywall, plaster, or finishes at the contractor's expense.

3. Final Inspection

• Timing: Scheduled after all finished walls and floors are completed, all fixtures (water closets, urinals, sinks, lavatories, showers) are fully set and sealed, water heaters and boilers are operational, trim is installed, and all systems are energized.
• Testing & Verification:
  • All traps must hold full, unevaporated water seals.
  • Fixture fittings and shutoff valves are checked under dynamic flow for leaks.
  • Water heater temperature and pressure (T&P) discharge piping is verified (terminating not more than 6 inches above, and not less than two times the discharge pipe diameter above, the floor or flood level rim of the waste receptor - MPC 504.6).
  • Scald prevention valves are verified to deliver water not exceeding 120°F (49°C).
  • Backflow prevention assemblies have certification test tags attached.

Inspection Scheduling and Re-Inspection Fees

Contractors must provide reasonable advance notice (typically at least 24 hours) when requesting an inspection. If an inspector arrives and finds the jobsite locked, the work incomplete, or the required pressure test not holding, a failed inspection is logged and the contractor may be assessed a mandatory re-inspection fee before the inspector will return.

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Code Enforcement, Violations & Stop Work Orders

When plumbing installations deviate from the Michigan Plumbing Code or threaten public health, the code official is armed with statutory enforcement mechanisms:

Notice of Violation (MPC Section 115)

A written document served upon the permit holder or person responsible for the property. It specifies:

1. The exact section of the Michigan Plumbing Code or Part 7 rules violated.
2. The specific corrective actions required to bring the installation into compliance.
3. A mandatory deadline for compliance (typically 10 to 30 calendar days).

Stop Work Orders

A Stop Work Order is the most immediate and severe field enforcement action available to an inspector.

• Triggers for Issuance: Issued whenever plumbing work is being performed without a permit, contrary to approved construction documents, by unlicensed personnel, in an unsafe or hazardous manner, or when rough plumbing has been concealed without required inspections.
• Service of Notice: The order is posted in a conspicuous location on the jobsite and served in writing to the owner or contractor.
• Legal Effect: Upon posting, all plumbing operations specified in the order must halt immediately. No further work may proceed except that which the code official expressly authorizes in writing to correct the hazardous conditions or remove code violations.
• Michigan-specific note: Part 7 does not adopt IPC Sections 113.1 to 113.4 (Stop Work Order), 114.1 to 114.4 (Means of Appeals), or 115.3. In Michigan, stop-work and appeal authority flow from the Stille-DeRossett-Hale Single State Construction Code Act (1972 PA 230) and the enforcing agency's ordinance, while R 408.30718 amends MPC 108.4 so that a person who violates the code or installs plumbing contrary to approved documents, a directive, a permit, or a certificate "shall be subject to review and may result in licensing action pursuant to the skilled trades regulation act, 2016 PA 407, MCL 339.5101 to 339.5517."
• Unlawful Continuance: Continuing work after a stop-work order (other than authorized corrective work) exposes the licensee to licensing action under 2016 PA 407 and to the penalties the enforcing agency's ordinance provides.

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Realistic Exam Scenario: Unpermitted Replacement and Inspection Failure

Exam Scenario: A homeowner hires an unlicensed handyman to replace a leaking 50-gallon atmospheric gas water heater in the basement of a single-family home. The handyman installs the water heater, connects the existing gas flex connector, and runs the T&P relief valve discharge line horizontally out through the basement rim joist to discharge 8 feet above an exterior concrete walkway. No permit is pulled.

Two weeks later, a city plumbing inspector spots the exterior pipe during a neighborhood inspection and issues an immediate Notice of Violation and Stop Work Order. What specific violations occurred, and who is legally liable?

Code Analysis:

1. Permit Violation (MPC 106.1): Replacing a water heater is never exempt work; a permit was required prior to installation.
2. Unlicensed Contracting (MCL 339.6111): The handyman performed plumbing work for compensation without a plumbing contractor or master plumber license. The homeowner cannot claim a homeowner exemption because the homeowner did not personally perform the work.
3. T&P Relief Discharge Violation (MPC 504.6): MPC 504.6 requires the discharge to terminate not more than 6 inches above, and not less than two times the discharge pipe diameter above, the floor, waste receptor flood level rim, or ground, and to discharge in a manner that does not cause personal injury. A line terminating 8 feet above a public walkway violates both the termination-height rule and the personal-injury rule.
4. Enforcement Outcome: The homeowner is cited for unpermitted work and must hire a licensed plumbing contractor to obtain a permit, re-pipe the installation to code, submit to rough and final inspections, and pay potential penalty fees.