Spot the Violation

PlumbingFixtures & clearancesLevel 22018 UPC

Tight powder room

Close view of a small powder room. A white two-piece elongated toilet sits against the back wall near the left-hand wall, with a paper holder on the left wall. A yellow tape measure is pressed flat against the back wall just above the tank lid, hooked against the left wall; it reads 15 at the middle of the tank and runs on to the left edge of a vanity countertop on the right, where it reads 33, with the tape case sitting on the counter. The vanity has a dark wood cabinet, a white top with an oval sink and a chrome faucet, and a mirror above it. 12345678910111213141516171819202122232425262728293031323334
Powder room, final inspection

What's wrong here?

  1. Nothing. This installation is compliant
  2. A toilet must be at least 18 in. from its center to a side wall
  3. The vanity must be 30 in. from the center of the toilet
  4. The toilet must be centered between the wall and the vanity
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Show the answer and the code reference

The answer

Nothing is wrong: the toilet's centerline is exactly 15 in. from the finished side wall and 18 in. from the vanity top, both at or over the 15 in. minimum.

Correct choice: 1. Nothing. This installation is compliant

UPC 402.5 requires at least 15 in. from the center of a water closet to any side wall or obstruction, at least 30 in. center to center between similar fixtures, and at least 24 in. of clear space in front of a water closet or lavatory. The tape hooked on the finished side wall reads 15 at the center of the tank, which is the minimum and therefore compliant, and the vanity top's edge is at 33, or 18 in. from the toilet's center. Nothing in view crowds the space in front of the bowl. Sitting exactly at the minimum looks tight, but the code sets a minimum, not a preferred dimension.

How to fix it

No correction needed. When laying out a new bath, set the flange at 15-1/2 to 16 in. from the framing so drywall and tile do not push the finished dimension under 15 in.

Code reference

  • UPC 2018 402.5 — Setting

    Fixtures must be set level and in proper alignment. No water closet or bidet may be set closer than 15 in. from its center to a side wall or obstruction, nor closer than 30 in. center to center to a similar fixture, and the clear space in front of a water closet, lavatory or bidet must be at least 24 in.

    Drills citing 402.5

Minnesota

MN adopts this rule as writtenConfidence: medium

Minnesota adopts the 2018 Uniform Plumbing Code with Minnesota amendments as the Minnesota Plumbing Code (Minn. Rules ch. 4714, effective Dec. 17, 2021). No Minnesota amendment to UPC 402.5 is known; check ch. 4714 before relying on it. Accessible toilet rooms in buildings covered by the Minnesota Accessibility Code (Minn. Rules ch. 1341) have their own, larger clearances.

About the Minnesota Plumbing Code

Why the other choices are wrong

  • A toilet must be at least 18 in. from its center to a side wall. UPC 402.5 sets 15 in. from the center of a water closet to a side wall or obstruction; 16 to 18 in. is the accessible-toilet dimension from the accessibility standards, which do not apply to this dwelling powder room.
  • The vanity must be 30 in. from the center of the toilet. The 30 in. center-to-center spacing in 402.5 is between two similar fixtures, such as two water closets; a vanity is an obstruction that needs only 15 in. from the toilet's center, and this one is 18 in. away.
  • The toilet must be centered between the wall and the vanity. No rule requires centering; each side only needs 15 in. from the toilet's centerline, and here the wall is at 15 in. and the vanity at 18 in.
Code complianceLevel 2 · Journeyman#water closet#toilet#clearance#vanity#powder room#calibration

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