New build house smell

[Dobson]

Hi, we just moved to a new build. There is a dreadful 'sewer' smell in the house. No outside soil stack. AAV is sited behind bath panel in family bathroom upstairs. Had this replaced as plumber thought may be faulty, no change in smell. We are one of three houses and there is a joint pump station to the main sewer. There doesn't appear to be a vent on the pumping station, should there be? I have read advice and put all the plugs in downstairs sinks and covered with water to form a seal. This does seem to have stopped smell but obviously not answer to problem. Can't get builder to take notice! PLEASE can anyone advise what the problem could be.

 

[king of pipes]

Very hard to say without seeing the job is your drainage free flowing ? Any problems with toilets flushing ? Bath water emptying? Have the external drainage covers been lifted to look for blockages ?

 

[PETE 123]

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.

 

[ROGER12345]

Very hard to say without seeing the job is your drainage free flowing ? Any problems with toilets flushing ? Bath water emptying? Have the external drainage covers been lifted to look for blockages ?

Thanks, yes drain covers have lifted and no blockage. Water/toilets drains freely and not slow.

 

[ROGER12345]

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.

Thanks, we have plugged all sinks, opened one by one and it seems to be the kitchen sink that's the fault. That does have a small AAV attached to it since the problem started but didn't stop smell.

 

[Ric2013]

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.

Agreed. Then get plumber to replace the trap on that sink or washbasin with an air inlet or resealing trap. Could be a DIY job if you're handy.

 

[ROGER12345]

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.

Hi, just to add. We didn't block the overflows but it (so far) has stopped the smell by plugging sink and leaving water in sink. Seems to be kitchen sink. Have unplugged utilities and downstairs toilet sinks.

 

[ROGER12345]

Agreed. Then get plumber to replace the trap on that sink or washbasin with an air inlet or resealing trap. Could be a DIY job if you're handy.

Thank you, he did put a small AAV on under sink but that didn't stop smell. Do you think a resealing trap would do better? Also our next door neighbour has same smell in family bathroom, do you think it could be connected as they were built at same time, only months ago?

 

[Dobson]

Very hard to say without seeing the job is your drainage free flowing ? Any problems with toilets flushing ? Bath water emptying? Have the external drainage covers been lifted to look for blockages ?

Hi, I have replied but unsure if its on here...Drains checked & water free running.

 

[Dobson]

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.

Replied but not shown....New to this! Did as you said but not covered overflows. The kitchen sink seems to be culprit. Plumber did put a small AAV ON but smell continued. It has a u bend (p trap?) Should I change that to an actual trap one?