A bathroom sink almost always blocks in the same place: around the pop-up stopper mechanism and in the few inches of pipe immediately below it. That is good news, because it is the most accessible blockage in the house and often the cheapest to clear.
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How a contractor actually diagnoses it
- They lift the pop-up stopper. On most basins it unclips or unscrews, and the mat of hair and soap is usually hanging off it.
- They check whether the basin is slow or fully blocked. Slow means partial build-up; fully blocked usually means something further along.
- They remove and inspect the P-trap, catching the water in a bowl first.
- If the trap is clear, they auger the trap arm into the wall — typically only three to six feet before it meets the stack.
Three ways this actually fails
Soap and hair around the pop-up
The overwhelming cause. Toothpaste and soap scum make hair sticky, and the stopper linkage gives it something to wrap around.
Scale narrowing the trap arm
In hard-water regions, mineral build-up reduces the effective diameter over years and gives the soap mat somewhere to anchor.
A shared branch with the bath
When the basin and the bath are on the same branch, a blockage past their junction makes both misbehave, and neither is the real problem.
Signs this is urgent rather than annoying
- Water backing up into the bath when the basin drains
- Standing water that has not cleared overnight
- A sewage smell rather than a soapy or musty one — that points at the trap or the vent, not the drain
What it costs
Published third-party ranges shown so you can sanity-check a quote. Not our prices, not an estimate, not a quote.
| Job | Published national range | Source |
|---|---|---|
| Bath sink drain clearing | $100–$250 | HomeGuide |
| Bathroom sink clog | $110–$215 | Angi |
| Call-out / trip fee | $50–$200 | HomeGuide |
Published national ranges, shown for educational context only. These are not quotes and they are not our prices. Sources disagree with each other — that spread is real. Only the contractor who sees your line can price your job.
Full cost guide, by fixture and by method →
Questions people ask
How do I find clogged bathroom sink near me?
Call the number on this page and give us your town or ZIP code. We match it against partner coverage and connect you with an independent licensed contractor who works that area. We do not charge you anything — the contractor sets their own price.
Can I clear it myself?
Often, yes — this is the one drain where DIY genuinely works. Lift the stopper out, pull the hair mat off it, and put it back. If that does not do it, the next step is the trap, which needs a bowl underneath and a willingness to get wet.
Why does it smell even when it drains?
Because the smell is usually not the clog. Bathroom basins that go unused for weeks lose the water seal in the trap, and sewer gas comes back up. Run the tap for thirty seconds and see if it clears within a day.
Should I use a chemical cleaner?
Hair dissolvers work better on a basin than on any other drain, but they are hard on older metal traps and on the rubber seals in the pop-up assembly. If the basin blocks monthly, dissolving it monthly is treating the symptom.
What if both the basin and the bath are slow?
Then the blockage is past the point where they join, and no amount of work at the basin will fix it. That is a branch line job.
Why does it keep coming back?
Two people brushing teeth and washing hair over one small basin puts a surprising amount of material down a 1¼-inch pipe. A stopper you can lift out and rinse weekly is the single most effective prevention there is.
Is the pop-up assembly worth replacing?
If the linkage is corroded or the stopper no longer seats, yes — a worn assembly catches far more than a clean one, and the part is inexpensive.
What does it cost?
Published national ranges run about $100–$250 (HomeGuide) and $110–$215 (Angi), before any call-out fee. National context, not a quote.