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How to fix a wall leak

We'll help you shut off water, locate the leak, and know when to call a plumber.

How-to · Home plumbing
15–30 min (containment); repair varies
What you'll need
  • Main shutoff access
  • Drywall saw (to open wall)
  • Fan or dehumidifier
  • Drywall patch materials (after pipe is fixed)

At a glance

  • Shut off the main water supply if water is actively leaking from the wall.
  • Locate the leak by checking for wet spots, stains, or soft drywall—often near bathrooms or under sinks.
  • A plumber can use a leak detector or open the wall to find and repair the pipe.
  • Repair the wall only after the pipe is fixed and the cavity is dry.
Quick triage — pick your path

Get started

Choose the option that matches what you see. You can jump straight to that section.

Steps

Goal: Shut off water, locate the leak, and repair the pipe and wall.

  • Shut off the main water supply. See Shut off water.
  • Locate the leak area by checking for wet spots and soft drywall. See Locate the leak.
  • Cut an access hole and call a plumber to repair the pipe. See Call a plumber.
  • Dry the cavity and patch the wall after the pipe is fixed. See Verification.

Shut off water

Goal: Stop active water flow to minimize damage.

  • Turn off the main shutoff to stop all water. If the leak is from a single fixture, shut the supply valve under the sink or behind the toilet instead.
  • Good: Water stops dripping from the wall. Proceed to Locate the leak.
  • Bad: Water continues—confirm you turned the correct valve or call a plumber.

Locate the leak

Goal: Narrow the leak to a section of wall so you can open it.

  • Look for wet spots, stains, bubbling paint, or soft drywall. Feel for cool or damp areas. Water runs downward, so the leak may be above the visible damage.
  • Check walls near bathrooms, under sinks, and near water heaters.
  • Good: You identify the general area. Proceed to Cut an access hole.
  • Bad: Cannot narrow it down—a plumber can use a leak detector.

Cut an access hole

Goal: Expose the pipe so a plumber can repair it.

  • Use a drywall saw to cut a hole large enough to see the pipe. Cut along studs so you can patch later. Wear gloves.
  • Good: You see the pipe and the leak. Proceed to Call a plumber.
  • Bad: The pipe is behind another layer or you cannot reach it—call a plumber.

Call a plumber

Goal: Have the pipe repaired before closing the wall.

  • Do not patch the wall until the pipe is fixed. The plumber will repair the leak. Confirm the leak is stopped before drying and patching.
  • Good: The pipe is repaired and no longer leaks. Proceed to dry and patch.
  • Bad: The plumber finds a larger issue—follow their recommendation.

When to get help

Call a plumber if:

  • Water is spraying under pressure.
  • You cannot locate or access the pipe.
  • The leak is from a main line or complex fitting.
  • You are not comfortable cutting the wall or repairing pipes.

Shut off the main water supply first to minimize damage.

Verification

  • Water is shut off and no longer leaking.
  • The pipe is repaired by a plumber.
  • The wall cavity is dry before patching.
  • The drywall patch is flush and painted.

Reviewed by Blackbox Atlas

Frequently asked questions

What causes a wall leak?
Common causes: a corroded or burst pipe inside the wall, a loose fitting, or a leaking pipe joint. Leaks often appear as stains, soft spots, or bubbling paint. The wet area may be below the actual leak because water runs down.
Can I fix a wall leak myself?
You can shut off water and cut open the wall to expose the pipe. Repairing the pipe—soldering, replacing fittings, or rerouting—usually requires a plumber. Do not close the wall until the pipe is fixed.
When should I call a plumber for a wall leak?
Call a plumber if water is spraying, you cannot locate the pipe, or the leak is from a main line or complex fitting. Shut off the main water supply first to minimize damage.

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