P-Trap Replacement Cost
Replacing a P-trap runs $100 – $250 for most sinks. The part is a few dollars in PVC or more in chrome-brass; the cost is the visit. A slip-joint plastic trap is one of the more honest DIY jobs in plumbing, but a corroded metal trap can fight back. Here is the pricing and how to tell which one you have.
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| Item | Range | Note |
|---|---|---|
| P-trap replacement (installed) | $100 – $250 | Sink trap, standard access |
| PVC trap (part) | $5 – $20 | White plastic, slip-joint, DIY-friendly |
| Chrome-brass trap (part) | $20 – $60 | Exposed traps on pedestal sinks |
| Trap arm or tailpiece replacement | +$30 – $80 | When connecting pieces are also corroded |
| Minimum service call | $100 – $200 | Most plumbers have a floor for small jobs |
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Why your sink has a trap at all
The U-shaped bend under every sink is not a quirk of plumbing; it is a deliberate water seal. The curve holds a small amount of water that blocks sewer gas from rising out of the drain and into the room. Without it, your bathroom would smell like the sewer line it connects to.
That is why a missing or dry trap is a common culprit when a room smells foul, the kind of detective work in our sewer smell in the house guide. The trap does its job silently for years, which is also why people forget it exists until it leaks, corrodes through, or becomes the spot where a kitchen sink stops draining.
PVC vs chrome-brass
Most modern traps are white PVC: cheap, corrosion-proof, and held together with hand-tight slip-joint nuts. A PVC trap part costs $5 – $20 and lasts effectively forever because plastic does not rust. It is the default under any sink where the plumbing is hidden in a cabinet.
Chrome-brass traps show up where the plumbing is visible, like a pedestal sink or a wall-hung lavatory, because the polished metal looks finished. They cost more ($20 – $60 for the part) and they do corrode from the inside over the years. An old chrome-brass trap that has gone thin and crusty is the kind that fails at the worst time, and replacing like-for-like keeps the exposed look while resetting the clock.
When it is a fair DIY and when it is not
Honestly stated: a slip-joint PVC trap is one of the friendliest repairs a homeowner can take on. Put a bucket underneath, loosen the two slip nuts by hand or with channel-lock pliers, pull the old trap, match the new one, and snug the nuts. No solder, no glue, no special tools. If it weeps after, a slight extra turn or reseating the washer usually fixes it, which is why the trap is a prime suspect on our leak under the kitchen sink guide.
The job stops being friendly when the trap is old corroded metal. Brass and steel slip nuts seize onto their threads, and forcing them can crack the tailpiece or the trap arm coming out of the wall, turning a $15 part into a $250 visit that also replaces the connecting pieces. If the nuts will not budge with reasonable hand pressure, stop and call a plumber rather than snapping a pipe you cannot reach.
The dry-trap quick fix nobody mentions
If a sink or floor drain that gets little use suddenly smells, the trap may simply be dry: the water seal evaporated and let sewer gas through. The fix costs nothing and takes ten seconds: run water down the drain to refill the trap, or pour a cup or two into a floor drain. The smell clears as the seal reforms.
A guest bathroom, a basement floor drain, or a rarely used utility sink are the usual offenders, especially in dry winter months. If the smell returns within days of refilling, the trap is not just dry: it may be cracked, unsealed, or improperly vented, which is when replacement at $100 – $250 enters the picture.
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