Copper pipe pinhole leak repair cost for home buyers

How much does it cost to fix a copper pipe pinhole leak?

Fixing one pinhole leak on copper pipe a plumber can reach costs a few hundred dollars. The bill climbs when the wall or ceiling has to come open, and one pinhole can be a sign of more. Before your deadline, get a licensed plumber to find the leak, check the rest of the copper, and give you a written bid. Ask the seller for that full number.

Key takeaways

• If the drywall is wet, opening the wall, patching and cleanup can bring one leak to $740 to $3,411.
• In a home built in the 1980s or earlier that already has pinholes, one Philadelphia-area plumber says the problem is likely systematic.
• Washington's insurance regulator says most homeowners policies don't cover gradual leaks, so get this one fixed before you close.

What goes into the repair bill?

The plumbing is often the small part. Plumbing Price Guide says drywall, paint and cleanup often double or triple the all-in cost of a leak inside a wall or ceiling.

Kept prices every line of an inspection report for $79, usually under 4 hours.

Homewyse also leaves out permit fees and sales tax. Your plumber can tell you whether a permit applies.

Here's the math for a pinhole that has soaked the drywall inside a finished wall. Homewyse's row covers the plumbing. Add Plumbing Price Guide's row for opening the wall, drywall and water damage cleanup. That's $740 ($340 + $400) to $3,411 ($411 + $3,000), before any permit fee or sales tax. If the wall is dry and only needs a patch, the wall-included pinhole row is the closer range.

A plumber's written bid replaces all of this once you have it. Get a drywall contractor's figure too if the plumber doesn't patch walls.

What does a pinhole leak on an inspection report mean?

A pinhole leak is a tiny hole that corrosion wears through copper pipe from the inside. Sila, a Philadelphia-area plumber, says the main cause is the water itself. Hard water, water that is too acidic or too basic, and sand or grit all wear the pipe. Fast water wears it too, especially at fittings and elbows where the flow turns quickly.

The Environmental Protection Agency (EPA) says copper pitting is very complicated, and the exact cause is often unknown. It also says severe pitting leads to pinhole leaks that "can potentially lead to water damage, mold growth, and costly repairs."

The risk is water you can't see. Sila says pinholes can seep into insulation and wall cavities unnoticed, and the hole grows over time. If the report says the leak is active or notes stains or damp drywall, get a licensed plumber out before your deadline. Ask them to check for hidden moisture too.

If your report names plastic supply pipe instead, see CPVC pipes on an inspection report.

Can you fix a pinhole leak in a copper pipe?

Yes. Plumbing Price Guide describes the usual fix: shut the water, drain the line, cut out about 4 inches of pipe around the pinhole, and put in a soldered or push-fit coupling. Fusion Plumbing & Air, a Tucson plumber, says the job often takes precise cutting, fitting and soldering to make a permanent seal.

Tape or a pipe clamp only holds until a plumber arrives. Fusion calls them "stop-gap measures" that "are not permanent fixes." If the seller patched the pipe that way, ask for the section replaced by a licensed plumber.

Is it one leak or the whole system?

That's the question that sets your number. Sila says pinhole leaks "can be a sign of systematic plumbing failure." For a home built in the 1980s or earlier that already has pinholes, Sila says the issue is likely systematic and re-plumbing may be the most cost-effective option. Plumbing Price Guide is blunter: one pinhole is a repair, but two in the same year usually point to aggressive water chemistry or improper grounding. It says a whole-house repipe pays back faster with recurring pinholes in three or more locations within a year.

Ask the plumber three things:

• Are there other pinholes or corrosion on the copper they can see?
• What type of copper is it? Sila says some thinner types degrade faster.
• Would a water test help? Sila suggests testing pH, hardness, alkalinity and total dissolved solids.

If the plumber says the house needs a repipe, get that as its own written bid. How to get repair estimates during the inspection period covers getting a plumber out fast.

What should you ask the seller for?

Ask for the leak repaired by a licensed plumber, the wall opened and closed, and any wet material dried or replaced. Write the line with the location from the report, the trade and your plumber's bid. Until the bid arrives, use the table's range for the same scope, not a lower number.

If the seller does the work, ask for the plumber's invoice and a note on what they saw in the rest of the line. What to ask for after a home inspection shows how this line sits with the rest of your list. The buyer repair request letter template has the wording around it.

What if the seller says no?

You have three choices:

• Take a credit or price cut instead, sized to the same bid.
• Accept the house as it is and budget for the repair yourself.
• Cancel inside your inspection window, if your contract allows it. Your contract sets the dates and terms, so confirm with your agent or attorney.

If the plumber finds pinholes all through the house and the seller won't move, when to walk away after a home inspection helps you decide.

How long does a pinhole leak repair take?

On pipe the plumber can reach, Plumbing Price Guide puts it at 30 to 60 minutes. A slab leak spot repair runs from 4 hours to 2 days.

Does homeowners insurance cover a pinhole leak?

Maybe not. Washington's Office of the Insurance Commissioner says most homeowners policies don't cover gradual leaks, and gives a leaky pipe behind a wall or under the floor as an example. It adds that mold coverage is usually limited to mold from a covered loss. Ask your own insurance agent what your policy would cover before your deadline.

What about the rest of my plumbing findings?

Price each one the same way: the location, the trade and a figure. The plumbing findings on an inspection report hub covers the other pipe problems inspectors flag.

If the plumber's bid is the one number you're waiting on, upload your inspection report to Kept to price the rest of your list before you write the request.

Sources

• Homewyse, Cost to Repair a Plumbing Leak
• Plumbing Price Guide, Pipe Repair Cost
• Fusion Plumbing & Air, What's the Real Cost to Fix a Leaking Pipe?
• Sila, Pinhole Leak in Your Copper Pipes? Know When to Repair or Replace
• EPA, Copper Pitting Corrosion and Pinhole Leaks: A Case Study
• Washington Office of the Insurance Commissioner, Leaks, Water Damage and Mold