Repairs and problems
Gurgling from a basin or shower when the toilet flushes
What actually fixes it
- 1
A partially blocked branch creates a slug of water that drags air behind it, siphoning nearby traps.
- 2
A failed or missing air admittance valve produces the same effect without any blockage present.
Worth checking on site
A partially blocked branch creates a slug of water that drags air behind it, siphoning nearby traps.


Common questions
Is gurgling serious?
It is an early warning of a blockage or venting fault and is easier to fix now than later.
Will it clear itself?
Rarely. Partial blockages generally get worse.
Second opinion on gurgling drains
If you already have a quote or a design and something does not sit right, it is worth another set of eyes before work starts.