If the problem is only affecting drains inside your home, the first step is to find out if more than one drain is affected.
If more than one drain is affected
- If more than one fitting, like a sink and a bath, is blocked or not draining properly, and they’re in different rooms, the problem could be with the main sewage outflow from your home. Please see our advice on outside blockages.
- If more than one fitting is blocked and they are in the same room, the problem is likely to be with a waste water pipe that those fittings share. In this case you could try using a liquid drain unblocker, though be aware that some harsh chemicals may mark or damage your plughole, so always check the manufacturer's recommendations first.
- If this doesn’t work you will need to contact a professional drain or plumbing specialist.
If only one drain is affected
If it’s just one fitting, like a sink or shower, that’s not draining properly, the blockage is probably in or near to that specific plughole.
- For sinks, showers and baths the trap (the top part of the plughole) can usually be unscrewed or unclipped, removed and cleaned.
- If this doesn’t solve the problem then use a plunger to try and dislodge whatever debris is blocking the drain.
- With a little water in the bottom of the sink, bath or shower, place the plunger firmly over the plughole with one hand, and pump it up and down sharply while blocking the overflow holes with the other hand.
- If a plunger doesn’t solve the problem, try using a liquid drain unblocker, though be aware that some harsh chemicals may mark or damage your plughole, so always seek the manufacturer's recommendations first.
- If this doesn’t work you’ll need to contact a professional drain or plumbing specialist.