Spot the Violation

PlumbingMinnesota plumbing licensing, permits & inspectionsLevel 22018 UPC

Basement bathroom, owner's rough-in

Basement bathroom wall framed with open studs in front of a concrete foundation wall. A new white PVC drain and vent stack runs up one bay with a sanitary tee and a capped lavatory stub-out; red and blue PEX lines rise to capped stub-outs on a crossblock. A blue plumbing permit card marked Homeowner is stapled to a stud with Rough-in and Final lines, both blank. Sheets of drywall lean against the far wall, not yet hung, and a level and a PVC cement can sit on the floor. 2 IN PVC DWV PLUMBING INSPECTION RECORD HOMEOWNER ROUGH-IN FINAL
Basement bathroom in a single-family house, rough-in complete

The owner lives in this single-family house and is doing all of the plumbing herself. The city allows homeowner plumbing permits, and she has one. The rough-in inspection is booked for tomorrow, and the drywall waits until it passes. What's wrong here?

  1. Nothing. This installation is compliant
  2. Only a licensed plumber may install drain and vent piping; homeowners are limited to replacing fixtures
  3. A homeowner doing work on her own house does not need a plumbing permit
  4. The drywall must be hung before the rough-in inspection so the inspector can check the finished wall
Start this drill
Show the answer and the code reference

The answer

Nothing is wrong. An owner-occupant may do her own plumbing under a homeowner permit, and the piping is still exposed for the rough-in inspection.

Correct choice: 1. Nothing. This installation is compliant

Minnesota's owner exemption in Minn. Stat. 326B.46 lets a person without a plumbing license do plumbing on premises she owns and actually occupies as a residence, as long as the work meets the Plumbing Board's standards and no local ordinance forbids it. This is a single-family house she lives in, she is doing the work herself, and the city issues homeowner permits, so the exemption fits. The exemption does not waive the permit or the inspections. She has the permit, and the walls are open with the ROUGH-IN line still blank, as Minn. Rules 1300.0215 requires: no piping is covered until it has been inspected, tested, and approved.

How to fix it

No correction needed. Keep the walls open and the stubs capped, have the test ready for the inspector, and hang drywall only after the ROUGH-IN line is signed.

Code references

  • Minn. Stat. 326B.46, subd. 1 — License required; owner-occupant exemption

    Anyone not licensed may do plumbing work that complies with the Plumbing Board's minimum standards on premises, or that part of premises, owned and actually occupied by the worker as a residence, unless otherwise forbidden by local ordinance.

    Drills citing 326B.46, subd. 1

  • Minn. Rules 1300.0215 — Plumbing inspections: covering of work

    No building drainage or plumbing system or part of one may be covered until it has been inspected, tested, and approved. If it is covered first, it must be uncovered on the direction of the administrative authority.

    Drills citing 1300.0215

  • Minn. Rules 1300.0120, subp. 1 — Permits: required

    An owner or authorized agent must get a permit from the building official before installing, altering, repairing, or replacing a plumbing system regulated by the code.

    Drills citing 1300.0120, subp. 1

Minnesota

Minnesota ruleConfidence: medium

This drill tests Minnesota licensing law and State Building Code administration, neither of which has a UPC counterpart. The owner exemption (Minn. Stat. 326B.46) covers only premises the owner actually occupies, and a city may forbid homeowner plumbing by ordinance, so ask the city first. The piping itself must meet the Minnesota Plumbing Code (Minn. Rules ch. 4714, the 2018 UPC with Minnesota amendments).

About the Minnesota Plumbing Code

Citation under review. Audited 2026-10-04. The exemption wording ('owned and actually occupied by the worker as a residence', subd. 1(a)) and the 1300.0215 covering rule and minor-work permit waiver for one- and two-family dwellings were confirmed through search results quoting the statute and rule (direct fetch of revisor.mn.gov blocked). Whether a given city allows homeowner plumbing permits is local, so the drill states it as a given.

Why the other choices are wrong

  • Only a licensed plumber may install drain and vent piping; homeowners are limited to replacing fixtures. Minn. Stat. 326B.46 lets an unlicensed person do plumbing that meets the Plumbing Board's standards on premises she owns and actually occupies as a residence, unless a local ordinance forbids it. That includes new drain, vent and water piping, not just fixture swaps.
  • A homeowner doing work on her own house does not need a plumbing permit. The owner exemption is from licensing, not from the permit. Where plumbing permits are issued, the owner pulls one and calls for the same inspections a contractor would. Minn. Rules 1300.0215 lets the authority waive the permit only for a short list of minor replacements that don't alter the piping, and new drain, vent and water piping is not on it.
  • The drywall must be hung before the rough-in inspection so the inspector can check the finished wall. It's the reverse. Minn. Rules 1300.0215 says piping may not be covered until it has been inspected, tested, and approved, so the walls stay open for the rough-in.
Code complianceLevel 2 · Journeyman#minnesota#homeowner-exemption#permit#rough-in#compliant

More in Minnesota plumbing licensing, permits & inspections

Minnesota plumbing licensing, permits & inspections (4)Plumbing drillsAll drills