How much does it cost to fix a leaking trap after a kitchen renovation?

What you're actually paying for

A trap that starts leaking right after a kitchen remodel is one of the cheapest plumbing problems you'll ever face. The parts are plastic and the fix is mechanical.

If you do it yourself, you're looking at $15–$90, and most of that is a trap kit and maybe a new washer set. Call a plumber and it's $150–$350, mostly the trip charge and first-hour labor.

Here's the part homeowners miss: the leak usually isn't a defective part. A new sink or disposal changed the height under there, and the old trap got forced into an angle it can't seal at.

That's why a plumber can often fix it in twenty minutes. They're not replacing broken pipe, they're re-squaring the connection.

The 2026 cost breakdown

DIY parts are cheap. A full PVC P-trap kit runs $12 to $25, a washer pack is $4 to $8, and if you don't own channel locks that's another $15 to $20.

Total DIY is $15–$90, and the pliers are a one-time buy you'll use for years.

A plumber's minimum is where most of the pro cost lives. Expect a $75 to $125 trip or service charge plus a first-hour rate around $110 to $175.

That lands a normal trap rebuild at $150–$350. Most shops won't send someone for less than that.

If the drain needs realignment or a glued joint has to be cut out and re-welded, add $75 to $200. Water-damaged cabinet repair is a separate trade and cost entirely.

How we build these estimates

Our cost ranges come from current US retail parts pricing and typical plumber service rates for 2026, weighted toward the middle of the market rather than the cheapest or the emergency premium.

Pro figures assume a standard daytime service call with a trip charge and a first-hour minimum, which is how most shops actually bill this kind of small job.

The likelihood ratings reflect what field techs see most often on post-renovation trap leaks, where assembly errors far outnumber failed parts.

Your local labor rate, cabinet damage, and whether the work is under warranty will move your final number more than anything in the parts bill.

Why new work leaks

The most common cause is a slip nut that's either loose or cranked down so hard it cracked. PVC nuts want hand-tight plus a quarter turn, nothing more.

Right behind that is alignment. When a reno swaps in a deeper basin or adds a garbage disposal, the drain outlet moves. The trap now sits crooked, so the washer seals on one edge and gaps on the other.

Then there's the washer itself. Those beveled nylon washers only work facing one direction, and it's easy to flip one or leave it in the box during a fast install.

A sneaky one: somebody wrapped Teflon tape or smeared pipe dope on a slip joint. That's a compression seal, not a threaded seal, so the tape actually props the washer off its seat.

Least common but most expensive is a bad glued joint on new drain pipe. Those leak steady and can't be hand-tightened. That's where the bill jumps.

How to find and fix it

Start by emptying the cabinet and putting down dry paper towels. You want a clean, dry field so the first drop tells you something.

Run the faucet steady for two minutes and watch from below with a flashlight. Then fill the basin all the way and pull the plug, because a full drain load pressurizes joints that a trickle won't.

Once you see the drip point, mark it. It'll be dry again in a minute and you don't want to lose it.

For a slip-nut leak, back the nut all the way off. Check the washer sits flat with the bevel pointed in toward the pipe, wipe everything clean, and re-tighten by hand plus a quarter turn.

If the trap looks tilted, don't fight it. Buy a trap kit with an adjustable extension tube, dry-fit the whole assembly loose, get it square to the wall stub, then snug the nuts.

• Channel-lock pliers (one pair is plenty)
• A shallow bucket or baking pan
• A flashlight or headlamp
• A trap kit sized to your drain (kitchens are usually 1-1/2 inch)
• Paper towels and a rag

DIY or call someone

This is one of the safer DIY plumbing jobs. No water pressure, no soldering, no gas. If the leak is at a slip nut or washer, you can handle it in half an hour.

Rebuild the whole trap with a fresh kit if you're unsure which joint is bad. It's cheap insurance and you replace every washer at once.

Call a plumber if the wall stub sits at the wrong height, if a glued joint is weeping, or if you've rebuilt the trap twice and it still drips.

Also call if you've got an older chrome trap that's corroded thin. Those crumble when you touch them and you'll want it swapped to PVC.

Honest take: if it takes you longer to buy the kit than a plumber's trip charge is worth to you, just call. No shame in it.

Can this wait?

A tiny weep can technically wait a day or two while you get parts. Anything more, deal with it now.

The reason is the cabinet floor. Kitchen sink bases are usually particleboard, and it swells and delaminates fast once it's wet. A $40 trap fix turns into a $400 to $700 cabinet problem.

Mold is the other clock. A dark, damp cabinet grows it within a week or two, and once it's in the base panel you're into removal and cleanup.

Short version: put a bucket under it today, fix it this week. Don't leave a wet cabinet through a vacation.

Working under there safely

If there's a garbage disposal, kill its power first. Unplug it or flip the breaker, then confirm it won't spin.

You'll be wedged into a tight cabinet on your back or side. Pad the edge, wear glasses, and keep the flashlight where you're not holding it in your teeth.

Watch what's already down there. If the base is soft or you see black staining, dry it out completely and check for mold before you seal it back up.

None of this needs a permit or an inspector. It's a fixture repair, and the trap is designed to come apart by hand.

What your trap material tells you

In homes built or remodeled in the last 20 years, kitchen traps are almost always white PVC. Those parts are standard, cheap, and forgiving. Any hardware store has them.

In older homes you may still find chrome-plated brass traps. They look nicer but corrode from the inside, and old ones crack when you disturb them.

If a fresh reno left an old chrome trap in place and it's now leaking, that's your sign to convert to PVC while you're in there. The adapters cost a couple dollars.

One thing that trips people up: some kitchens run 1-1/4 inch traps and some run 1-1/2 inch. Measure before you buy, or bring the old part to the store.