How much does it usually cost to fix a leaking pipe under a sink in Las Vegas?

Most basic under-sink leak repairs cost between $125 and $350 when caught early. Costs rise if shutoff valves, cabinets, flooring, or drywall are damaged.

Can I fix an under-sink leak myself?

Sometimes. Loose slip nuts and basic trap adjustments can be DIY-friendly. If valves leak, water will not shut off, or there is water damage, call a professional.

Is a slow drip urgent?

Yes. Slow drips can quietly damage cabinet floors, drywall, flooring, and baseboards. The earlier you catch it, the cheaper it usually is to repair.

Why does the leak only happen when I run water?

That usually points to a drain-side leak — loose trap, worn gasket, cracked drain pipe, or drain assembly issue.

Why is water leaking even when the sink is off?

That often points to the supply side — shutoff valve, braided supply line, or a pressurized water connection.

How Much Does It Cost To Fix A Leaking Pipe Under A Sink in Las Vegas? | Mikes PRO Handyman Services

Opening a cabinet and finding water where it should not be immediately raises two questions: how bad is this, and how much is it going to cost?

Most under-sink leaks are not disasters when caught early. The problem is that many homeowners do not notice them until the cabinet floor is swollen, the shutoff valve is stuck, or water has already reached the drywall.

Mike's Note

After working on Las Vegas homes for more than two decades, I have found that most under-sink leaks fall into a handful of common categories. Some are simple fixes. Others are warning signs of bigger problems hiding just behind the cabinet door.

Drain Leak or Supply Leak?

Knowing which side is leaking changes how urgent the repair is.

If it only leaks when the sink is running, the issue is probably drain-side — P-trap, slip nut, drain gasket, tailpiece, or garbage disposal connection. Drain-side leaks are generally less expensive when caught early because the water is not pressurized.

If water appears even when the sink is off, the issue is supply-side — shutoff valve, braided supply line, or faucet connection. Supply-side leaks are more urgent because they continue whether the sink is used or not.

Pro Tip

Dry everything under the sink completely before running water. The very first new drip usually shows you exactly where the problem is. Do not guess — watch for it.

What Usually Causes Under-Sink Leaks?

Most leaks come from the same handful of components:

Loose drain connections that gradually loosen over time
Worn washers and gaskets that no longer seal properly
Cracked P-traps caused by age, impact, or overtightening
Leaking shutoff valves under the sink
Old braided supply lines beginning to fail
Garbage disposal connections that loosen or leak

In Las Vegas, hard water accelerates most of these problems. Mineral buildup wears down seals, cartridges, and valve seats faster than you would expect.

Can You Fix It Yourself?

DIY repairs are reasonable when the leak is on the drain side, no water damage is present, shutoff valves work properly, and you have the correct replacement gasket or trap.

Cost Alert

A $10 part can turn into a much larger job if the shutoff valve is frozen or seized. Attempting a repair without being able to isolate the water is where small repairs become expensive ones.

Why Las Vegas Sink Leaks Can Get Worse Quickly

Hard water wears down seals and valve seats. Dry desert air makes rubber components brittle over time. Older shutoff valves seize if they have not been turned in years. And because most homeowners store cleaning supplies under the sink, a slow drip can stay hidden far longer than it should.

Mike's Note

By the time the cabinet gets cleaned out and the leak becomes obvious, the damage is often already underway. The cabinet floor swells quietly. You do not see it until you press on it.

What I Check During an Under-Sink Repair

When I inspect an under-sink leak, I look at more than the obvious drip — trap condition, drain alignment, slip nut and gasket condition, faucet connections, braided supply lines, shutoff valves, cabinet floor condition, and signs of previous water damage or hard-water buildup.

Quick Win

The goal is not just to stop today's leak. A proper inspection usually catches the next problem before it starts — and that is almost always cheaper than a second service call.

A sink leak is one of those repairs that is almost always cheaper when handled early. If you see water under the sink, do not wait for it to become obvious. Obvious usually means expensive.

Leaking Pipe Under Your Sink? Here's What Las Vegas Homeowners Usually Pay To Fix It

Home Report

Common Causes of Under-Sink Leaks

Drain Leak or Supply Leak?

What Usually Causes Under-Sink Leaks?

Can You Fix It Yourself?

Why Las Vegas Sink Leaks Can Get Worse Quickly

What I Check During an Under-Sink Repair

Read Next