The short answer
What You Can Do Yourself
The first step is always the same: shut off the water to that line. If you do not know which valve controls it, shut off the main water valve for the house. Then open a faucet below the leak to drain the line and reduce pressure.
If the leak is a pinhole or a loose joint, you might be able to patch it temporarily with a pipe repair clamp or epoxy. But a temporary patch is not a permanent fix. The wall behind the pipe may already be wet, and that moisture can lead to rot or mold if not dried properly.
- Turn off the water supply first
- Open a faucet to drain the line
- Use a repair clamp for a temporary stop
- Check the surrounding drywall for dampness
- Do not close the wall back up until everything is dry
When to Call the Pros
If the leak is larger than a pinhole, if the pipe is corroded, or if you cannot locate the exact source, it is time to call the pros. They have tools like moisture meters and thermal cameras to find hidden water without tearing open your walls unnecessarily.
The pros can also handle the cleanup and drying that follow a leak. They know how to dry out wall cavities properly, which is critical to preventing mold and structural issues. Trying to do that yourself with a fan and a dehumidifier often leaves moisture behind.
Policies vary, and your insurer decides what is covered. Check your policy to see if water damage from a pipe leak is included, and document the damage with photos before any repairs begin.
Steps to Protect Your Home
Keep your shutoff valve location written down. In a climate with wet winters and dry summers, pipes can freeze in cold snaps, so knowing how to shut off water quickly is a smart habit.
After you stop the leak, remove any wet drywall and insulation that you can see. Set up fans and a dehumidifier to dry the area. But remember, hidden moisture may still be in the wall cavity, so a professional inspection is often worth the cost.
Do not paint over a wet stain. That traps moisture and can lead to peeling paint and mold. Wait until the area is completely dry, then repair the wall properly.
What the Pros Usually Do
The pros first find the leak and assess how far the water has spread. They use moisture meters to see inside the wall, then extract standing water and set up drying equipment.
The drying process can take several days, depending on the materials and how much water was involved. After the wall is dry, the pipe repair is done, and the drywall is replaced. The pros also check for mold and other issues that might have developed.
The cost of professional help varies. It often depends on the size of the leak, the extent of damage, and how long the water sat. A small leak with minimal damage might cost less than a major burst, but you will not know until an inspection is done.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (425) 407-5186Frequently asked questions
What tools do I need to fix a leaky pipe behind a wall?
You need a pipe wrench, a repair clamp or epoxy, a utility knife to cut drywall, and a bucket. You also need a flashlight to see the leak clearly. But if the pipe is corroded or the leak is large, those tools may not be enough.
How do I know if the leak is behind the wall?
Look for water stains, bubbling paint, or a musty smell. You might also hear a dripping sound. If you have a moisture meter, you can test the drywall. But sometimes the leak is only visible from the other side of the wall, so check both sides.
Can I leave a temporary patch on a pipe?
A temporary patch is not a long-term fix. It can hold for a while, but it may fail again, especially if the pipe is under pressure. The pros can replace the damaged section of pipe permanently. Leaving a patch can lead to repeated leaks and more water damage.